[FIXED] How to get rid of input/output error for a file created using with statement in python?

Issue

process1.py

import sys
with open("Main.txt", "w+") as sys.stdout:
    eval(c)

In this code value of c was already defined and text file was also created but it raised this error ValueError: I/O operation on closed file. when I tried to print the text file Main.txt using this code

import process1
f = open("Main.txt", "r")
for x in f:
  print(x)

What should I do to make it work?

Solution

I think you want:

with open("Main.txt", "w+") as file:
    with contextlib.redirect_stdout(file):
       ...

The code you wrote literally assigns the newly opened file to the variable sys.stdout, executes the wrapped code, and then calls close(sys.stdout). But sys.stdout's value is still the closed file.

Answered By - Frank Yellin

Answer Checked By - Dawn Plyler (PHPFixing Volunteer)