Search And Replace Specific Line Which Starts With Specific String In A File

My requirement is to open a properties file and update the file, for update purpose i need to search for a specific string which stores the url information. For this purpose i have

Solution 1:

I'm pretty sure that this is not the best way of doing that, but this is still one way:

withopen(input_file_name, 'r') as f_in, open(output_file_name, 'w') as f_out:
    for line in f_in:
        if line.startswith("gStrOwsEnv"):
            f_out.write(reowsURL)
        else:
            f_out.write(line)

That script copy every line of input_file_name into output_file_name except the lines that you want to change.