I would like to find the last occurrence of a number of characters in a string.
str.rfind() will give the index of the last occurrence of a single character in a string, but I need the index of the last occurrence of any of a number of characters. For example if I had a string:
test_string = '([2+2])-[3+4])'
I would want a function that returns the index of the last occurence of {, [, or { similar to
test_string.rfind('(', '[', '{')
Which would ideally return 8. What is the best way to do this?
max(test_string.rfind('('), test_string.rfind('['), test_string.rfind('{'))
seems clunky and not Pythonic.
You can use generator expression to do this in a Pythonic way.
max(test_string.rfind(i) for i in "([{")
This iterates through the list/tuple of characters that you want to check and uses rfind() on them, groups those values together, and then returns the maximum value.
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