Python中利用遍历法在列表中查找特定元素

　　#Searching element from list by traversal from random import * Flag=1 times_Appear=0 while Flag:     list_Length=int(input(＂Enter the length of list(Length>=25) :＂))     if list_Length<25:         print(＂Length doesn＂t meet the requests＂)         Flag=0     else:         List_Before=[1]*list_Length         ＂＂＂         Initialization list         ＂＂＂         for index_First in range(0,list_Length):             List_Before[index_First-1]=randint(1,100)         print(＂A list of length {} generated from random numbers is :＂.format(list_Length))         for index_First in range(0,list_Length):             print(List_Before[index_First],end=＂ ＂)         number_Search=int(input(＂Enter the number you want to search :＂))         for index_First in range(0,list_Length):             if number_Search==List_Before[index_First]:                 times_Appear+=1                 print(＂{} in list in location {}＂.format(number_Search,index_First))         if times_Appear==0:             print(＂{} not in the list＂.format(number_Search))         print(＂{} appear {} times,the possiblity of appearance is {}＂.format(number_Search,times_Appear,times_Appear/list_Length))     Flag=int(input(＂ Enter 1 to cotinue and 0 to exit :＂))     if Flag!=1 and Flag!=0:         Flag=0         print(＂The Flag you input is not meet the requests,force exit＂)