如何在python中向后搜索？

Question

I am working with html files which have item 1, item 1a and item 2. is there a way to search backwards and find the item 1a which comes before an item 2?

example:

text= """ this is an example item 1a thanks for helping item 2 blah blah item 1a""" 

Answer 1

Use str.rfind() method to search for the occurence of a string in the reverse direction. This question should also give you some insight on how to go about

Answer 2

yes... use the 'r' functions:

text= """ this is an example item 1a thanks for helping item 2 blah blah item 1a"""
text.rfind("1a")