int/str/list/tuple/dict必会
#int int() #dict get update keys values items #可迭代都可索引，切片，for循环 for item in interable #str replace find join strip startswith split upper lower format #list append extend insert #tuple
#int int() #dict get update keys values items #可迭代都可索引，切片，for循环 for item in interable #str replace find join strip startswith split upper lower format #list append extend insert #tuple