Python 3.6以后 变量注解

# 3.6 以后变量注解
s: str = 'asdf'
l: list = [1,2,3]
d: dict = {'a':'aaa','b':'bbb','c':'ccc'}
t: tuple = (1,2,3,4)

print(s)
print(l)
print(d)
print(t)

# 字符串格式化
name = 'cyl'
str_1 = f'你好 {name}'
print(str_1)

num1 = 4
num2 = 5
str_2 = f'{num1 + num2} 不等于 {2*(num1+num2)}'
print(str_2)

asdf
[1, 2, 3]
{'a': 'aaa', 'b': 'bbb', 'c': 'ccc'}
(1, 2, 3, 4)
你好 cyl
9 不等于 18