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Take contents of a file, convert them to a single line and append them to the original file Python

December 9, 2022

I’m working on solving a task that requires that I open a text file in Python. The file has 3 lines:

Moose
Chases
Car

I need to read that file, then append the three words concatenated on the 4th line. So, the modified text file would contain:

Moose
Chases
Car
Moose Chases Car

I’m new to working with files, so I am not sure why what I am doing is not modifying the file.

def func(value):
    return ''.join(value.splitlines())

f = open("WordTextFile1.txt", "a+")
myString = f.read()
new_str = func(myString)
f.write(new_str)
f.close

Any assistance is greatly appreciated.

>Solution :

Try this.

def func(value):
    return  '\n' + ' '.join(value.splitlines()) 

with open("abc.txt", "r+") as f:
    data = func(f.read())
    
    f.write(data)

When you read the file in the a+ mode, it actually returns nothing.

Or you can seek to the start of file before reading it. when using a+ mode.

def func(value):
    return  '\n' + ' '.join(value.splitlines()) 

with open("abc.txt", "a+") as f:
    f.seek(0)
    data = func(f.read())
    f.write(data)