View replace_text.py
| 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'): |