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import fileinput | |
def replace_text_in_file_demo(): | |
""" | |
1. The original file is moved to a backup file | |
2. The standard output is redirected to the original file within the loop | |
3. Thus any print statements write back into the original file | |
""" | |
for line in fileinput.input('foo.txt', inplace=True, backup='.bak'): |