Eoferror eof when reading a line питон как исправить

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