My program is not running (

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# Program to remove all the lines that contain the character `a' in a file and write it to another file.

What I have tried:

file=open('C:\\Users\\Admin\\OneDrive\\Documents\\sh.txt','r')
lines=file.readlines()
filen = open('C:\\Users\\Admin\\OneDrive\\Documents\\sh.txt','w')
files = open('sha.txt','w')
for i in lines:
    if 'a' in i:
        files.write(i)
    else:
        filen.write(i)
print(filen.read())
print(files.read())

Posted 11-Jun-23 4:49am

Shrishti singh 11th A

Updated 11-Jun-23 8:41am

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Comments

Dave Kreskowiak 11-Jun-23 11:26am

Did you want to post error messages you're getting, or should everyone just guess?

Richard MacCutchan 11-Jun-23 12:01pm

At a (very rough) guess, the file you are trying to read is either empty, or does not exist.

3 solutions

Solution 1

Quote:
My program is not running

First of all make sure the problem, add checkpoints.

PHP

print("Program Started")
file=open('C:\\Users\\Admin\\OneDrive\\Documents\\sh.txt','r')
lines=file.readlines()
filen = open('C:\\Users\\Admin\\OneDrive\\Documents\\sh.txt','w')
files = open('sha.txt','w')
for i in lines:
    if 'a' in i:
        files.write(i)
    else:
        filen.write(i)
print(filen.read())
print(files.read())
print("Program Ended")

Posted 11-Jun-23 6:09am

Patrice T

Solution 2

You're trying to write a file that you opened for reading: sh.txt; "file" (r) and "filen" (w).

Posted 11-Jun-23 7:29am

Gerry Schmitz

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OriginalGriff · Accepted Answer · 2023-06-11T08:41:00

When you open a file for reading, that establishes an non-exclusive lock on the file - which means that other people can also read it.
But ... opening a file for writing needs to establish an exclusive lock so that only one process can write to the file. If there are existing locks, the attempt to open the file will automatically fail as an exclusive lock cannot be established.

And if you have opened a file for writing, you can't read lines from it as it is created if it doesn't exist, or truncated to an empty file if it does - so your two reads at the bottom don't work either!