in关键字和Python示例
in关键字
in是python中的一个关键字(区分大小写),用于检查元素是否以给定的顺序存在,例如字符串,列表,元组等。
in关键字也与for循环一起使用以迭代序列。
in关键字的语法
if element in sequence: statement(s)
for element in sequence: statement(s)示例
Input:
cities = ["New Delhi", "Mumbai", "Chennai", "Banglore"]
if "Mumbai" in cities:
print("Yes")
else:
print("No")
Output:
Yesin关键字的Python示例
示例1:检查元素是否在列表中不存在。
cities = ["New Delhi", "Mumbai", "Chennai", "Banglore"]
if "Mumbai" in cities:
print("Yes \"Mumbai\" exists in the list")
else:
print("No \"Mumbai\" does not exist in the list")
if "Gwalior" in cities:
print("Yes \"Gwalior\" exists in the list")
else:
print("No \"Gwalior\" does not exist in the list")输出结果
Yes "Mumbai" exists in the list No "Gwalior" does not exist in the list
示例2:取一个字符串并逐个打印字符,直到找不到点(“。”)。
#python代码演示示例
#in关键字
#取一个字符串,一个接一个地打印字符
#直到找不到点('.')。
#字符串输入
string = input("Enter a string: ")
#打印字符直到找不到点为止
for ch in string:
if ch=='.':
break print(ch)输出结果
Enter a string: nhooo.com n h o o o