Q: Search and replace strings in 2GB text file size I want to search and replace some file paths in text files.
on average the my file size is above 2 GB.
for example:
i have a folder in my D drive "D:\LargeFilesFolder".
and all files exist in the folder.
"D:\LargeFilesFolder\large_file_v001.txt"
"D:\LargeFilesFolder\large_file_v002.txt"
"D:\LargeFilesFolder\large_file_v003.txt"

In all text files i want to search for "X:\path\link\here"  and replace with "Y:\here\link\path"
What is the best optimized python way to read and edit big text files in python..?

A: Iterate over the lines and write a new file. Then move the new file over the old file.
with open(outputfilename, "w") as outputfile:
    with open(inputfilename, "r") as inputfile:
        for line in inputfile:
            # replace in line and write to outputfile

shutil.move(outputfilename, inputfilename)

