python字符串相关函数 *title *upper *lower *swapcase *len *count *find *index *starts with *endswith *isalpha *isdecimal *split *center *strip *replace
python字符串相关函数 *title *upper *lower *swapcase *len *count *find *index *starts with *endswith *isalpha *isdecimal *split *center *strip *replace