def find(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ """ S.find(sub[, start[, end]]) -> int Return the lowest index in S where substring sub is found, such that sub is contained within S[start:end]. Optional arguments start and end are interpreted as in slice notation. Return -1 on failure. """ return 0
name="wesley hello world wesley wesley" ret=name.find(‘he‘,2,8) print(ret) #找不到返回-1 ret=name.find(‘e‘) print(ret) #找到返回索引
-1
1
原文：https://www.cnblogs.com/wuxi9864/p/9870140.html