python之if条件

1.if条件循环，注意缩进

# if条件
a = {"Alice":12}
if a.get("Alice") >= 18:
    print("恭喜你，成年了")#注意此处缩进
else:
    print("未成年")

输出结果

未成年

2.and：条件同时满足

#and
age = int(input("plase input your age:"))
grade = int(input("plase input your grade(0-700):"))
if age >=18 and age <= 40 and grade >=500:
    print("you have been accepted") #注意此处缩进
else:
    print("we catn't admit you")

输出结果

plase input your age:10
plase input your grade(0-700):600
we catn't admit you

3.or满足其中一个条件即可

# or
age = int(input("plase input your age:"))
grade = int(input("plase input your grade(0-700):"))
if age >=18 or grade >=500:
    print("you can play games") #注意此处缩进
else:
    print("we catn't play games")

输出结果

plase input your age:18
plase input your grade(0-700):100
you can play games

4.not取反

# not
age = int(input("plase input your age:"))
if not age < 18 :
    print("you can play games") #注意此处缩进
else:
    print("we catn't play games")

输出结果

plase input your age:15
we catn't play games

5.if多条件

# if多条件
number1 = int(input("plase input a number:"))
if number1 >= 10 :
    print(number1," >= 10") #注意此处缩进
elif number1 >= 5:
    print("5<=",number1," < 10")
elif number1 >=1:
    print("1<=",number1," < 5")
else:
    print(number1,"<=0")

输出结果

plase input a number:-1
-1 <=0