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str.rfind(str, beg=0, end=len(string))

#!/usr/bin/python3

str1 = "this is really a string example....wow!!!"
str2 = "is"

print (str1.rfind(str2))

print (str1.rfind(str2, 0, 10))
print (str1.rfind(str2, 10, 0))

print (str1.find(str2))
print (str1.find(str2, 0, 10))
print (str1.find(str2, 10, 0))

5
5
-1
2
2
-1