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This article is to share with you about what you need to pay attention to when you modify the python file. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

1 back up files before operation.

2 read the contents of the file into a list using readlines.

Write some keywords and their related lines to a dictionary.

4 additions, deletions and changes do not necessarily change the smallest unit, the smaller the more troublesome, you can directly ask to write a complete line, and then use split to list the input lines to compare the operation.

5 after the addition, deletion and modification operation is completed, the list to be written is updated, which can be updated at one level of the for loop.

6 finally, the new content list is written to the file.

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