What is the selection statement in python?

Python's selection statements mainly have three forms, namely: 1. if statement; 2. "if...else" statement; 3. "if...elif...else" multi-branch statement .

Python selection statement

There are three main forms of selection statements in Python, namely:

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!")

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