E0f error python

So as we can see in the pictures above, despite having produced the expected output, our test case fails due to a runtime error EOFError i.e., End of File Error. Let’s understand what is EOF and how to tackle it.

What is EOFError

In Python, an EOFError is an exception that gets raised when functions such as input() or raw_input() in case of python2 return end-of-file (EOF) without reading any input.

When can we expect EOFError

We can expect EOF in few cases which have to deal with input() / raw_input() such as:

Interrupt code in execution using ctrl+d when an input statement is being executed as shown below
Another possible case to encounter EOF is, when we want to take some number of inputs from user i.e., we do not know the exact number of inputs; hence we run an infinite loop for accepting inputs as below, and get a Traceback Error at the very last iteration of our infinite loop because user does not give any input at that iteration

n=int(input())
if(n>=1 and n<=10**5):
    phone_book={}
    for i in range(n):
        feed=input()
        phone_book[feed.split()[0]]=feed.split()[1]
    while True:
        name=input()
        if name in phone_book.keys():
            print(name,end="")
            print("=",end="")
            print(phone_book[name])
        else:
            print("Not found")

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The code above gives EOFError because the input statement inside while loop raises an exception at last iteration

Do not worry if you don’t understand the code or don’t get context of the code, its just a solution of one of the problem statements on HackerRank 30 days of code challenge which you might want to check
The important part here is, that I used an infinite while loop to accept input which gave me a runtime error.

How to tackle EOFError

We can catch EOFError as any other error, by using try-except blocks as shown below :

try:
    input("Please enter something")
except:
    print("EOF")

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You might want to do something else instead of just printing «EOF» on the console such as:

n=int(input())
if(n>=1 and n<=10**5):
    phone_book={}
    for i in range(n):
        feed=input()
        phone_book[feed.split()[0]]=feed.split()[1]
    while True:
        try:
            name=input()
        except EOFError:
            break
        if name in phone_book.keys():
            print(name,end="")
            print("=",end="")
            print(phone_book[name])
        else:
            print("Not found")

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In the code above, python exits out of the loop if it encounters EOFError and we pass our test case, the problem due to which this discussion began…

Hope this is helpful
If you know any other cases where we can expect EOFError, you might consider commenting them below.

Источник

width, height = map(int, input().split())
def rectanglePerimeter(width, height):
   return ((width + height)*2)
print(rectanglePerimeter(width, height))

Running it like this produces:

% echo "1 2" | test.py
6

I suspect IDLE is simply passing a single string to your script. The first input() is slurping the entire string. Notice what happens if you put some print statements in after the calls to input():

width = input()
print(width)
height = input()
print(height)

Running echo "1 2" | test.py produces

1 2
Traceback (most recent call last):
  File "/home/unutbu/pybin/test.py", line 5, in <module>
    height = input()
EOFError: EOF when reading a line

Notice the first print statement prints the entire string '1 2'. The second call to input() raises the EOFError (end-of-file error).

So a simple pipe such as the one I used only allows you to pass one string. Thus you can only call input() once. You must then process this string, split it on whitespace, and convert the string fragments to ints yourself. That is what

width, height = map(int, input().split())

does.

Note, there are other ways to pass input to your program. If you had run test.py in a terminal, then you could have typed 1 and 2 separately with no problem. Or, you could have written a program with pexpect to simulate a terminal, passing 1 and 2 programmatically. Or, you could use argparse to pass arguments on the command line, allowing you to call your program with

test.py 1 2

Источник

Dec 27, 2017 9:30:42 PM |
Python Exception Handling — EOFError

A close look at the EOFError in Python, including a functional code sample showing how to handle user input in both Python 2 and Python 3.

Moving along through our in-depth Python Exception Handling series, today we’ll be going over the EOFError. The EOFError is raised by Python in a handful of specific scenarios: When the input() function is interrupted in both Python 2.7 and Python 3.6+, or when input() reaches the end of a file unexpectedly in Python 2.7.

Throughout this article we’ll examine the EOFError by seeing where it resides in the overall Python Exception Class Hierarchy. We’ll also look at some fully functional code examples that illustrate how the different major versions of Python handle user input, and how improper use of this functionality can sometimes produce EOFErrors, so let’s get to it!

The Technical Rundown

All Python exceptions inherit from the BaseException class, or extend from an inherited class therein. The full exception hierarchy of this error is:

BaseException
- Exception
  - EOFError

Full Code Sample

Below is the full code sample we’ll be using in this article. It can be copied and pasted if you’d like to play with the code yourself and see how everything works.

# input_test_3.6.py

import sys

from gw_utility.logging import Logging
def main():
 try:
 Logging.log(sys.version)
 title = input("Enter a book title: ")
 author = input("Enter the book's author: ")
 Logging.log(f'The book you entered is '{title}' by {author}.')
 except EOFError as error:
 # Output expected EOFErrors.
 Logging.log_exception(error)
 except Exception as exception:
 # Output unexpected Exceptions.
 Logging.log_exception(exception, False)
if __name__ == "__main__":
 main()

# input_test_2.7.py

import sys
def main():
 try:
 print(sys.version)
 title = input("Enter a book title: ")
 author = input("Enter the book's author: ")
 print('The book you entered is '' + title + '' by ' + author + '.')
 except EOFError as error:
 # Output expected EOFErrors.
 print(error)
 except Exception as exception:
 # Output unexpected Exceptions.
 print(exception, False)
if __name__ == "__main__":
 main()

# raw_input_test_2.7.py

import sys
def main():
 try:
 print(sys.version)
 title = raw_input("Enter a book title: ")
 author = raw_input("Enter the book's author: ")
 print('The book you entered is '' + title + '' by ' + author + '.')
 except EOFError as error:
 # Output expected EOFErrors.
 print(error)
 except Exception as exception:
 # Output unexpected Exceptions.
 print(exception, False)
if __name__ == "__main__":
 main()

# logging.py

import math

import sys

import traceback
class Logging:
 separator_character_default = '-'
 separator_length_default = 40
 @classmethod
 def __output(cls, *args, sep: str = ' ', end: str = 'n', file=None):
 """Prints the passed value(s) to the console.
 :param args: Values to output.
 :param sep: String inserted between values, default a space.
 :param end: String appended after the last value, default a newline.
 :param file: A file-like object (stream); defaults to the current sys.stdout.
 :return: None
 """
 print(*args, sep=sep, end=end, file=file)
 @classmethod
 def line_separator(cls, value: str = None, length: int = separator_length_default,
 char: str = separator_character_default):
 """Print a line separator with inserted text centered in the middle.
 :param value: Inserted text to be centered.
 :param length: Total separator length.
 :param char: Separator character.
 """
 output = value
 # If no value passed, output separator of length.
 if value == None or len(value) == 0:
 output = f'{char * length}'
 elif len(value) < length:
 # Update length based on insert length, less a space for margin.
 length -= len(value) + 2
 # Halve the length and floor left side.
 left = math.floor(length / 2)
 right = left
 # If odd number, add dropped remainder to right side.
 if length % 2 != 0:
 right += 1



  


                       
  




 # Surround insert with separators.
 output = f'{char * left} {value} {char * right}'
 cls.__output(output)
 @classmethod
 def log(cls, *args, sep: str = ' ', end: str = 'n', file=None):
 """Prints the passed value(s) to the console.
 :param args: Values to output.
 :param sep: String inserted between values, default a space.
 :param end: String appended after the last value, default a newline.
 :param file: A file-like object (stream); defaults to the current sys.stdout.
 """
 cls.__output(*args, sep=sep, end=end, file=file)
 @classmethod
 def log_exception(cls, exception: BaseException, expected: bool = True):
 """Prints the passed BaseException to the console, including traceback.
 :param exception: The BaseException to output.
 :param expected: Determines if BaseException was expected.
 """
 output = "[{}] {}: {}".format('EXPECTED' if expected else 'UNEXPECTED', type(exception).__name__, exception)
 cls.__output(output)
 exc_type, exc_value, exc_traceback = sys.exc_info()
 traceback.print_tb(exc_traceback)

When Should You Use It?

Before we can take a look at some code samples we need to briefly review the built-in input() function in Python. Simply put, in Python 3 input() presents a console prompt to the user and awaits user input, which is then converted to a string and returned as the result of the input() function invocation. However, Python 2 had a slightly different behavior for input(), as it still prompts the user, but the input the user provides is parsed as Python code and is evaluated as such. To process user input using the Python 3 behavior, Python 2 also included the raw_input() function, which behaves the same as the Python 3 input() function.

To better illustrate these differences let’s take a look at a few simple code snippets, starting with the input_test_3.6.py file:

# input_test_3.6.py

import sys

from gw_utility.logging import Logging
def main():
 try:
 Logging.log(sys.version)
 title = input("Enter a book title: ")
 author = input("Enter the book's author: ")
 Logging.log(f'The book you entered is '{title}' by {author}.')
 except EOFError as error:
 # Output expected EOFErrors.
 Logging.log_exception(error)
 except Exception as exception:
 # Output unexpected Exceptions.
 Logging.log_exception(exception, False)
if __name__ == "__main__":
 main()

As you can see, the only thing we’re doing here is requesting user input() two times for a book author and title, then outputting the result to the log. Executing this code in Python 3.6 produces the following output:

3.6.3 (v3.6.3:2c5fed8, Oct  3 2017, 18:11:49) [MSC v.1900 64 bit (AMD64)]

Enter a book title: The Stand

Enter the book's author: Stephen King

The book you entered is 'The Stand' by Stephen King.

That works as expected. After entering The Stand at the prompt for a title and Stephen King at the author prompt, our values are converted to strings and concatenated in the final output. However, let’s try executing the same test in Python 2.7 with the input_test_2.7.py file:

# input_test_2.7.py

import sys
def main():
 try:
 print(sys.version)
 title = input("Enter a book title: ")
 author = input("Enter the book's author: ")
 print('The book you entered is '' + title + '' by ' + author + '.')
 except EOFError as error:
 # Output expected EOFErrors.
 print(error)
 except Exception as exception:
 # Output unexpected Exceptions.
 print(exception, False)
if __name__ == "__main__":
 main()

Running this and entering The Stand for a title immediately raises a SyntaxError, with an underlying EOFError:

2.7.14 (v2.7.14:84471935ed, Sep 16 2017, 20:25:58) [MSC v.1500 64 bit (AMD64)]

Enter a book title: The Stand

(SyntaxError('unexpected EOF while parsing', ('<string>', 1, 9, 'The Stand')), False)

As discussed earlier, the problem here is how Python 2 interprets input from the, well, input() function. Rather than converting the input value to a string, it evaluates the input as actual Python code. Consequently, The Stand isn’t valid code, so the end of file is detected and an error is thrown.

The resolution is to use the raw_input() function for Python 2 builds, as seen in raw_input_test_2.7.py:

# raw_input_test_2.7.py

import sys
def main():
 try:
 print(sys.version)
 title = raw_input("Enter a book title: ")
 author = raw_input("Enter the book's author: ")
 print('The book you entered is '' + title + '' by ' + author + '.')
 except EOFError as error:
 # Output expected EOFErrors.
 print(error)
 except Exception as exception:
 # Output unexpected Exceptions.
 print(exception, False)
if __name__ == "__main__":
 main()

Executing this in Python 2.7 produces the following output:

2.7.14 (v2.7.14:84471935ed, Sep 16 2017, 20:25:58) [MSC v.1500 64 bit (AMD64)]

Enter a book title: The Stand

Enter the book's author: Stephen King

The book you entered is 'The Stand' by Stephen King.

Everything works just fine and behaves exactly like the input() test running on Python 3.6. However, we also need to be careful that the input isn’t terminated prematurely, otherwise an EOFError will also be raised. To illustrate, let’s execute raw_input_test_2.7.py in Python 2.7 again, but this time we’ll manually terminate the process (Ctrl+D) once the title prompt is shown:

2.7.14 (v2.7.14:84471935ed, Sep 16 2017, 20:25:58) [MSC v.1500 64 bit (AMD64)]

Enter a book title: ^D

EOF when reading a line

Unexpectedly terminating the input raises an EOFError, since the behavior from the Python interpreter’s perspective is identical to if it evaluated input and reached the end of the file. Similarly, let’s perform the same manual termination with input_test_3.6.py running on Python 3.6:

3.6.3 (v3.6.3:2c5fed8, Oct  3 2017, 18:11:49) [MSC v.1900 64 bit (AMD64)]

Enter a book title: ^D

[EXPECTED] EOFError: EOF when reading a line

  File "D:/work/Airbrake.io/Exceptions/Python/BaseException/Exception/EOFError/input_test_3.6.py", line 9, in main

    title = input("Enter a book title: ")

It’s worth noting that the gw_utility helper module isn’t written for Python 2 versions, so we don’t see the fancier error output in the previous Python 2 example, but otherwise the behavior and result is identical in both Python 2 and Python 3.

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Источник

В Python простой, но строгий синтаксис. Если забыть закрыть блок кода, то возникнет ошибка «SyntaxError: unexpected EOF while parsing». Это происходит часто, например, когда вы забыли добавить как минимум одну строку в цикл for.

В этом материале разберемся с этой ошибкой, и по каким еще причинам она возникает. Разберем несколько примеров, чтобы понять, как с ней справляться.

Ошибка «SyntaxError: unexpected EOF while parsing» возникает в том случае, когда программа добирается до конца файла, но не весь код еще выполнен. Это может быть вызвано ошибкой в структуре или синтаксисе кода.

EOF значит End of File. Представляет собой последний символ в Python-программе.

Python достигает конца файла до выполнения всех блоков в таких случаях:

Если забыть заключить код в специальную инструкцию, такую как, циклы for или while, или функцию.
Не закрыть все скобки на строке.

Разберем эти ошибки на примерах построчно.

Пример №1: незавершенные блоки кода

Циклы for и while, инструкции if и функции требуют как минимум одной строки кода в теле. Если их не добавить, результатом будет ошибка EOF.

Рассмотрим такой пример цикла for, который выводит все элементы рецепта:

ingredients = ["325г муки", "200г охлажденного сливочного масла", "125г сахара", "2 ч. л. ванили", "2 яичных желтка"]

for i in ingredients:

Определяем переменную ingredients, которая хранит список ингредиентов для ванильного песочного печенья. Используем цикл for для перебора по каждому из элементов в списке. Запустим код и посмотрим, что произойдет:

File "main.py", line 4
    
                     	^
SyntaxError: unexpected EOF while parsing

Внутри цикла for нет кода, что приводит к ошибке. То же самое произойдет, если не заполнить цикл while, инструкцию if или функцию.

Для решения проблемы требуется добавить хотя бы какой-нибудь код. Это может быть, например, инструкция print() для вывода отдельных ингредиентов в консоль:

for i in ingredients:
	print(i)

Запустим код:

325г муки
200г охлажденного сливочного масла
125г сахара
2 ч. л. ванили
2 яичных желтка

Код выводит каждый ингредиент из списка, что говорит о том, что он выполнен успешно.

Если же кода для такого блока у вас нет, используйте оператор pass как заполнитель. Выглядит это вот так:

for i in ingredients:
	pass

Такой код ничего не возвращает. Инструкция pass говорит о том, что ничего делать не нужно. Такое ключевое слово используется в процессе разработке, когда разработчики намечают будущую структуру программы. Позже pass заменяются на реальный код.

Пример №2: незакрытые скобки

Ошибка «SyntaxError: unexpected EOF while parsing» также возникает, если не закрыть скобки в конце строки с кодом.

Напишем программу, которая выводит информацию о рецепте в консоль. Для начала определим несколько переменных:

name = "Капитанская дочка"
author = "Александр Пушкин"
genre = "роман"

Отформатируем строку с помощью метода .format():

print('Книга "{}" - это {}, автор {}'.format(name, genre, author)

Значения {} заменяются на реальные из .format(). Это значит, что строка будет выглядеть вот так:

Книга "НАЗВАНИЕ" - это ЖАНР, автор АВТОР

Запустим код:

File "main.py", line 7

              ^
SyntaxError: unexpected EOF while parsing

На строке кода с функцией print() мы закрываем только один набор скобок, хотя открытыми были двое. В этом и причина ошибки.

Решаем проблему, добавляя вторую закрывающую скобку («)») в конце строки с print().

print('Книга "{}" - это {}, автор {}'.format(name, genre, author))

Теперь на этой строке закрываются две скобки. И все из них теперь закрыты. Попробуем запустить код снова:

Книга "Капитанская дочка" это роман. Александр Пушкин

Теперь он работает. То же самое произойдет, если забыть закрыть скобки словаря {} или списка [].

Выводы

Ошибка «SyntaxError: unexpected EOF while parsing» возникает, если интерпретатор Python добирается до конца программы до выполнения всех строк.

Для решения этой проблемы сперва нужно убедиться, что все инструкции, включая while, for, if и функции содержат код. Также нужно проверить, закрыты ли все скобки.

Источник

Introduction to Python EOFError

EOFError in python is one of the exceptions handling errors, and it is raised in scenarios such as interruption of the input() function in both python version 2.7 and python version 3.6 and other versions after version 3.6 or when the input() function reaches the unexpected end of the file in python version 2.7, that is the functions do not read any date before the end of input is encountered. And the methods such as the read() method must return a string that is empty when the end of the file is encountered, and this EOFError in python is inherited from the Exception class, which in turn is inherited from BaseException class.

Syntax:

EOFError: EOF when reading a line

Working of EOFError in Python

Below is the working of EOFError:

1. BaseException class is the base class of the Exception class which in turn inherits the EOFError class.

2. EOFError is not an error technically, but it is an exception. When the in-built functions such as the input() function or read() function return a string that is empty without reading any data, then the EOFError exception is raised.

3. This exception is raised when our program is trying to obtain something and do modifications to it, but when it fails to read any data and returns a string that is empty, the EOFError exception is raised.

Examples

Below is the example of Python EOFError:

Example #1

Python program to demonstrate EOFError with an error message in the program.

Code:

#EOFError program
#try and except blocks are used to catch the exception
try:
    	while True:
       		 #input is assigned to a string variable check
        		check = raw_input('The input provided by the user is being read which is:')
        		#the data assigned to the string variable is read
        		print 'READ:', check
#EOFError exception is caught and the appropriate message is displayed
except EOFError as x:
   	 print x

Output:

Explanation: In the above program, try and except blocks are used to catch the exception. A while block is used within a try block, which is evaluated to true, and as long as the condition is true, the data provided by the user is read, and it is displayed using a print statement, and if the data cannot be read with an empty string being returned, then the except block raises an exception with the message which is shown in the output.

Example #2

Python program to demonstrate EOFError with an error message in the program.

Code:

#EOFError program
#try and except blocks are used to catch the exception
try:
    	while True:
       			 #input is assigned to a string variable check
       			 check = raw_input('The input provided by the user is being read which is:')
        			#the data assigned to the string variable is read
        		 print 'Hello', check
#EOFError exception is caught and the appropriate message is displayed
except EOFError as x:
    	print x

Output:

Explanation: In the above program, try and except blocks are used to catch the exception. A while block is used within a try block, which is evaluated to true, and as long as the condition is true, the data provided by the user is read and it is displayed using a print statement, and if the data cannot be read with an empty string being returned, then the except block raises an exception with the message which is shown in the output.

Steps to Avoid EOFError in Python

If End of file Error or EOFError happens without reading any data using the input() function, an EOFError exception will be raised. In order to avoid this exception being raised, we can try the following options which are:

Before sending the End of File exception, try to input something like CTRL + Z or CTRL + D or an empty string which the below example can demonstrate:

Code:

#try and except blocks are used to catch the exception
try:
    	data = raw_input ("Do you want to continue?: ")
except EOFError:
    	print ("Error: No input or End Of File is reached!")
    	data = ""
    	print data

Output:

Explanation: In the above program, try and except blocks are used to avoid the EOFError exception by using an empty string that will not print the End Of File error message and rather print the custom message provided by is which is shown in the program and the same is printed in the output as well. The output of the program is shown in the snapshot above.

If the EOFError exception must be processed, try and catch block can be used.

Conclusion

In this tutorial, we understand the concept of EOFError in Python through definition, the syntax of EOFError in Python, working of EOFError in Python through programming examples and their outputs, and the steps to avoid EOFError in Python.

How Do You Fix the EOF While Parsing Error in Python?

If the unexpected EOF error occurs when running a Python program, this is usually a sign that some code is missing.

This is a syntax error that shows that a specific Python statement doesn’t follow the syntax expected by the Python interpreter.

For example, when you use a for loop you have to specify one or more lines of code inside the loop.

The same applies to an if statement or to a Python function.

To fix the EOF while parsing error in Python you have to identify the construct that is not following the correct syntax and add any missing lines to make the syntax correct.

The exception raised by the Python interpreter will give you an idea about the line of code where the error has been encountered.

Once you know the line of code you can identify the potential code missing and add it in the right place (remember that in Python indentation is also important).

SyntaxError: Unexpected EOF While Parsing with a For Loop

Let’s see the syntax error that occurs when you write a for loop to go through the elements of a list but you don’t complete the body of the loop.

In a Python file called eof_for.py define the following list:

animals = ['lion', 'tiger', 'elephant']

Then write the line below:

for animal in animals:

This is what happens when you execute this code…

$ python eof_for.py
  File "eof_for.py", line 4
    
                          ^
SyntaxError: unexpected EOF while parsing

ASyntaxError is raised by the Python interpreter.

The exception “SyntaxError: unexpected EOF while parsing” is raised by the Python interpreter when using a for loop if the body of the for loop is missing.

The end of file is unexpected because the interpreter expects to find the body of the for loop before encountering the end of the Python code.

To get rid of theunexpected EOF while parsing error you have to add a body to the for loop. For example a single line that prints the elements of the list:

for animal in animals:
    print(animal)

Update the Python program, execute it and confirm that the error doesn’t appear anymore.

Unexpected EOF While Parsing When Using an If Statement

Let’s start with the following Python list:

animals = ['lion', 'tiger', 'elephant']

Then write the first line of a if statement that verifies if the size of the animals list is great than 2:

if len(animals) > 2:

At this point we don’t add any other line to our code and we try to run this code.

$ python eof_if.py 
  File "eof_if.py", line 4
    
                        ^
SyntaxError: unexpected EOF while parsing

We get back the error “unexpected EOF while parsing”.

The Python interpreter raises the unexpected EOF while parsing exception when using an if statement if the code inside the if condition is not present.

Now let’s do the following:

Add a print statement inside the if condition.
Specify an else condition immediately after that.
Don’t write any code inside the else condition.

animals = ['lion', 'tiger', 'elephant']

if len(animals) > 2:
    print("The animals list has more than two elements")
else:

When you run this code you get the following output.

$ python eof_if.py 
  File "eof_if.py", line 6
    
         ^
SyntaxError: unexpected EOF while parsing

This time the error is at line 6 that is the line immediately after the else statement.

The Python interpreter doesn’t like the fact that the Python file ends before the else block is complete.

That’s why to fix this error we add another print statement inside the else statement.

if len(animals) > 2:
    print("The animals list has more than two elements")
else:
    print("The animals list has less than two elements")

$ python eof_if.py 
The animals list has more than two elements

The error doesn’t appear anymore and the execution of the Python program is correct.

Note: we are adding the print statements just as examples. You could add any lines you want inside the if and else statements to complete the expected structure for the if else statement.

Unexpected EOF While Parsing With Python Function

The error “unexpected EOF while parsing” occurs with Python functions when the body of the function is not provided.

To replicate this error write only the first line of a Python function called calculate_sum(). The function takes two parameters, x and y.

def calculate_sum(x,y):

At this point this is the only line of code in our program. Execute the program…

$ python eof_function.py
  File "eof_function.py", line 4
    
    ^
SyntaxError: unexpected EOF while parsing

The EOF error again!

Let’s say we haven’t decided yet what the implementation of the function will be. Then we can simply specify the Python pass statement.

def calculate_sum(x,y):
    pass

Execute the program, confirm that there is no output and that the Python interpreter doesn’t raise the exception anymore.

The exception “unexpected EOF while parsing” can occur with several types of Python loops: for loops but also while loops.

On the first line of your program define an integer called index with value 10.

Then write a while condition that gets executed as long as index is bigger than zero.

index = 10

while (index > 0):

There is something missing in our code…

…we haven’t specified any logic inside the while loop.

When you execute the code the Python interpreter raises an EOF SyntaxError because the while loop is missing its body.

$ python eof_while.py 
  File "eof_while.py", line 4
    
                      ^
SyntaxError: unexpected EOF while parsing

Add two lines to the while loop. The two lines print the value of the index and then decrease the index by 1.

index = 10

while (index > 0):
    print("The value of index is " + str(index))
    index = index - 1

The output is correct and the EOF error has disappeared.

$ python eof_while.py
The value of index is 10
The value of index is 9
The value of index is 8
The value of index is 7
The value of index is 6
The value of index is 5
The value of index is 4
The value of index is 3
The value of index is 2
The value of index is 1

Unexpected EOF While Parsing Due to Missing Brackets

The error “unexpected EOF while parsing” can also occur when you miss brackets in a given line of code.

For example, let’s write a print statement:

print("Codefather"

As you can see I have forgotten the closing bracket at the end of the line.

Let’s see how the Python interpreter handles that…

$ python eof_brackets.py
  File "eof_brackets.py", line 2
    
                      ^
SyntaxError: unexpected EOF while parsing

It raises the SyntaxError that we have already seen multiple times in this tutorial.

Add the closing bracket at the end of the print statement and confirm that the code works as expected.

Unexpected EOF When Calling a Function With Incorrect Syntax

Now we will see what happens when we define a function correctly but we miss a bracket in the function call.

def print_message(message):
    print(message)


print_message(

The definition of the function is correct but the function call was supposed to be like below:

print_message()

Instead we have missed the closing bracket of the function call and here is the result.

$ python eof_brackets.py
  File "eof_brackets.py", line 6
    
                  ^
SyntaxError: unexpected EOF while parsing

Add the closing bracket to the function call and confirm that the EOF error disappears.

Unexpected EOF While Parsing With Try Except

A scenario in which the unexpected EOF while parsing error can occur is when you use a try statement and you forget to add the except or finally statement.

Let’s call a function inside a try block without adding an except block and see what happens…

def print_message(message):
    print(message)


try:
    print_message()

When you execute this code the Python interpreter finds the end of the file before the end of the exception handling block (considering that except is missing).

$ python eof_try_except.py 
  File "eof_try_except.py", line 7
    
                    ^
SyntaxError: unexpected EOF while parsing

The Python interpreter finds the error on line 7 that is the line immediately after the last one.

That’s because it expects to find a statement that completes the try block and instead it finds the end of the file.

To fix this error you can add an except or finally block.

try:
    print_message()
except:
    print("An exception occurred while running the function print_message()")

When you run this code you get the exception message because we haven’t passed an argument to the function. Theprint_message() function requires one argument to be passed.

Modify the function call as shown below and confirm that the code runs correctly:

print_message("Hello")

Conclusion

After going through this tutorial you have all you need to understand why the “unexpected EOF while parsing” error occurs in Python.

You have also learned how to find at which line the error occurs and what you have to do to fix it.

I’m a Tech Lead, Software Engineer and Programming Coach. I want to help you in your journey to become a Super Developer!

Источник

Software errors are common. If you’re a regular user of the computer then you will be aware of a software error. There is no software that is free from the error.

But we can’t get rid of it. In other words, we can say that software error is present in every program.
Similar in Python EOF error occurs due to the wrong code. So, have you ever experienced the EOF error? Have you ever faced an EOF error while doing work on Python? If “yes”, this article will help you to find out the solution.

In this article, we will discuss the EOF error. Yet before that, we will learn about Python in a short description.

What is Python?

Well, Python is used for many things. It is used for high-level programming language and web development and so on. Besides, It aims to help programmers to write clear and logical code for small and large scale. It helps to run multiple programming paradigms and functional programming.

What is the EOF error in Python?

EOF stands for End Of File. Well, it is called an unexpected error by some technical developers of Python.

This error exists when the input ( ) procedure in both Python 2.7 and 3.6+ is disturbed when the input ( ) reaches the end of a file before reading all the codes.

This error comes out when you make a mistake in the structure or maybe in the syntax of your code.

What are the Reasons Behind EOF Error?

Well, like other errors reason. There’re some circumstances that cause an error. As it may be the cause of the wrong code. Now we discuss some unusual errors that appear in Python.

It is said that it is not an error, rather than the exception. And this exception is put up when one of the built-in functions, most commonly input ( ) reaches the end of the file without reading any data.

Sometimes all the program tries to perform and fetch something and modify it. Yet when it is unable to fetch, it means there will be an error that exist.

EOFerror is at the end of the file error. It occurs when a binary file in python has ended and cannot be able to read further. Sometimes it is because of the version problem. In Python 2 raw_input () function is used for getting input.

(For this check your version first)

Maybe your code is not supporting the input sequence. For fixing the error you just put code in the sequence.

Now we will discuss some common and usual EOF error. These situations are very common. We will clarify it with the help of an example.

As it is said before that this error happens when Python arrives at the end of the file before running every code. This happens because of:

•First the reason is when you don’t enclose a special statement like a loop or a function of code. And

•The second one is, you skip all the parenthesis in a line of code.

So we will discuss all two situations described above.

Wrapping a code in a special Statement:

In python, the function needs at least one line of code in the special statement for a loop. If you don’t add it then it will be the cause of EOF error. Have a look at the given example of a loop.

In the given above example, there is a variable called ingredients. That is a list of a store of a recipe.
If you run the code this will happen.

In the above case, we did not add any code in for loop. Therefore an EOF error occurs.
For a solution, we add some code to the loop. For this just add the Print ( ) statement.

After fixing the error

This shows that the error has fixed. In the case, if you do not make a special opinion then you can add “pass” as a placeholder.
Then this code will appear like this

The word “pass” is used by most developers when they build a program.

Enclosing Parenthesis

In Python an EOF error due to the missing parenthesis on a line of code. We use a string with a word like this .format ( ) to overcome the error.

When you have unlocked sets of parenthesis. Therefore this error comes to exist. This error can be fixed when you add (“)”) at the end of the print ( ) line of code.

If you don’t close line with the help of {} these brackets. Then this error will occur the Same thing will happen if you forget to close a line using [] these brackets.

Some Other Options to fixing the EOF error

You use try/except when reading your input string if an error exists you should check an empty string before printing it’s content, for example

1 try:
2. check = raw_input
(“would you like to continue? : “)
3 except EOFError:
4. print (“Error: EOF or
Empty input!”)
5. Check. = “ “
6 print check

Besides all, there is another trick if the raw_input function does not work properly then an error arises before reading all the data it will EOF error exception.

• Intake something before you send EOF (‘Ctrl+Z’+’Ctrl+D’)
• Try to find out the error if you want a technique for the solution.

As EOFerror is a simple syntax error. So there are some IDE add the same shutting parenthesis automatically. Well, there are some IDE who don’t do it.

Some tips to handle the EOF error

• You have to look at all the functions and their closing statements. Just make sure that all parameters and their syntaxes are correct.
• You have to check out the all parameters of every function before performing your program.
• You have to review all the corresponding incision. And try to be sure that everything is correct.

Final Words

The syntax error or unexpected End Of File error prevails when Python reaches at the end of the file without reading the code of line.
1. You can fix it. By checking out that allegation has loop and function has a proper code.
2. You have to check that all the parentheses are closed in the code.

Hopefully, you got the solution. If you have another technique to sort out the error then notify us with your precious idea.

[Fixed]Netflix Error code tvq-st-103 |7 Easy Tricks|
Fixed: Netflix This title is not available to watch instantly [ Simple Fixes ]

Источник

What is EOFError

When can we expect EOFError

How to tackle EOFError

Dec 27, 2017 9:30:42 PM |
Python Exception Handling — EOFError

The Technical Rundown

Full Code Sample

When Should You Use It?

Пример №1: незавершенные блоки кода

Пример №2: незакрытые скобки

Выводы

Introduction to Python EOFError

Working of EOFError in Python

Examples

Example #1

Example #2

Steps to Avoid EOFError in Python

Conclusion

Recommended Articles

How Do You Fix the EOF While Parsing Error in Python?

SyntaxError: Unexpected EOF While Parsing with a For Loop

Unexpected EOF While Parsing When Using an If Statement

Unexpected EOF While Parsing With Python Function

Unexpected EOF While Parsing Due to Missing Brackets

Unexpected EOF When Calling a Function With Incorrect Syntax

Unexpected EOF While Parsing With Try Except

Conclusion

Related posts:

What is Python?

What is the EOF error in Python?

What are the Reasons Behind EOF Error?

Wrapping a code in a special Statement:

Enclosing Parenthesis

Some Other Options to fixing the EOF error

Final Words

Читайте также:

What is EOFError

When can we expect EOFError

How to tackle EOFError

Dec 27, 2017 9:30:42 PM | Python Exception Handling — EOFError

The Technical Rundown

Full Code Sample

When Should You Use It?

Пример №1: незавершенные блоки кода

Пример №2: незакрытые скобки

Выводы

Introduction to Python EOFError

Working of EOFError in Python

Examples

Example #1

Example #2

Steps to Avoid EOFError in Python

Conclusion

Recommended Articles

How Do You Fix the EOF While Parsing Error in Python?

SyntaxError: Unexpected EOF While Parsing with a For Loop

Unexpected EOF While Parsing When Using an If Statement

Unexpected EOF While Parsing With Python Function

Unexpected EOF While Parsing Due to Missing Brackets

Unexpected EOF When Calling a Function With Incorrect Syntax

Unexpected EOF While Parsing With Try Except

Conclusion

Related posts:

What is Python?

What is the EOF error in Python?

What are the Reasons Behind EOF Error?

Wrapping a code in a special Statement:

Enclosing Parenthesis

Some Other Options to fixing the EOF error

Final Words

Читайте также:

Dec 27, 2017 9:30:42 PM |
Python Exception Handling — EOFError