Error eof when reading a line

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

Before starting how to fix EOF When Reading a Line using Python, it’s crucial to understand what causes it, or what even is it in the first place.

An EOF error occurs when you try to read from the end of a file. This can happen because there are no more lines left, or if your program expected some other value instead.

It might be due for example an encoding mistake made by accident while transferring data over Bluetooth connections etcetera!

EOFError(End Of File Error) is a type of exception handling error that Python raises because of either of the following reasons:

1. When the input() function is interrupted in both Python 2.7 and Python 3.6+
2. When the input() function reaches the end of the line unexpectedly in Python 2.7
3. You forgot to enclose your code within a special statement like a for loop or while loop
4. You did not close the parentheses properly i.e number of brackets is either more or less than it should be

The BaseException class is the base class of the Exception class which in turn inherits the EOFError class. Technically speaking, EOFError is not an error, but it is an exception.

When the built-in functions such as read() or input() return a string that is empty (unable to read any data), then the EOFError exception is raised.

Or in simple words, EOFError is raised when our program is trying to read or modify something but is unable to do so.

EXAMPLES OF EOFError

# You may also use like int(input())
# or alternative way
n = "10"
print(n * 10)

The code mentioned above will return an EOFError if no input is given to the online IDE, which means that there is no data for the program to work with.

Hence the error.

animals = ["cat", "dog", "mouse", "monkey"]
for i in animals:
    print(i)

In this code, we iterate through the “animals” list successfully but still, the IDE prompts an EOFError. This is because we haven’t put any code within our for-loop.

This is also the case with other statements, meaning that EOFError will be raised if we don’t specify any code within the while-loop, if-else statements, or a function.

To avoid this error we have to write some code, however small it is, within the loop. Or, if we don’t want to specify any code within the statement.

We can use the “pass” statement which is usually used as a placeholder for future code.

print("hello")

This code will also raise an EOFError since the number of parentheses opened and closed are not equal. To tackle this issue simply add a closing bracket at the end of the print statement.

We will be good to go. Another example of the same kind of problem is:

animals = ["cat", "dog", "mouse", "monkey"]

Since the closing square bracket is missing, the IDE will raise an EOFError.

animals = {'mammal':'cat', "fish":"shark"}
print(animals)

The same will be the case with dictionaries if the number of curly brackets is uneven.

Read more: How to Check if File Exists Using Python?

Read file

The most common reason for this is that you have reached the end of the file without reading all of the data.

To fix this, make sure that you read all of the data in the file before trying to access its contents. You can do this by using a loop to read through the file’s contents.

Alternatively, you can use a function like len() to find out how many bytes are in the file so that you can ensure that you read through all of them.

Fix EOFError: EOF When Reading a Line using Python

Conclusion

The statement “SyntaxError: unexpected EOF while parsing” is thrown by the IDE when the interpreter reaches the end of a program before every line of code has been executed.

To solve this error our first step should be to make sure that all statements such as for-loop, while-loop, if statements, etc contain some code. Next, we should make sure that all the parentheses have properly closed.

Read more: Ways To Use Python If Not

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 ]

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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