python的选择语句是什么语句

if语句

    格式:

        if 表达式:

            语句块(执行代码)

if...else语句

    格式:

        if 表达式:

            语句块

        else:

            语句块

if...elif...else多分支语句

   格式:

       if 表达式1:

           语句块1

       elif 表达式2:

           语句块2

       elif 表达式3:

           语句块3

       ...

       else:

           语句块n

# if 实例

print("今有物不知其数,三三数之剩二,五五数之剩三,七七数之剩二,问几何?")

num = int(input("请输入你认为符合条件的数字:"))

if (num % 3 == 2) and (num % 5 == 3) and (num % 7 == 2):

    print(num,"符合三三数之剩二,五五数之剩三,七七数之剩二")

# if...else 实例

print("今有物不知其数,三三数之剩二,五五数之剩三,七七数之剩二,问几何?")

num = int(input("请输入你认为符合条件的数字:"))

if (num % 3 == 2) and (num % 5 == 3) and (num % 7 == 2):

    print(num,"符合三三数之剩二,五五数之剩三,七七数之剩二")

else:

    print(num,"不符合!")