Question

I have the code:

filename = "C:/users/patrik/documents/mypython.txt"
with open(filename) as f:
    if f.readlines()[0] == "patrik's file": #first line
        f.write("This file has been read by patrik!")

Why does it not work? I’m not receiving any errors, and the file content gets messy after this, what am I doing wrong?

Answer 1

To perform both read and write operations on your file you can choose one of these modes:

'r+' :

Opens a file for both reading and writing. The file pointer will be at
the beginning of the file.

'a+':

Opens a file for both appending and reading. The file pointer is at
the end of the file if the file exists. The file opens in the append
mode. If the file does not exist, it creates a new file for reading
and writing.

Note that file is a builtin function in python, so you should not use it as a variable name