python3.7新特性

if __name__ == ‘__main__‘:
    s1 = "aa"
    s2 = "bb"
    s3 = ‘cc‘
    print(f"result:{s1}")
    print(f"result:{s1, s2, s3}")   # 解析成了一个字典，总结：{}里面可以写变量或这表达式

result:aa
result:(‘aa‘, ‘bb‘, ‘cc‘)

if __name__ == ‘__main__‘:
    aa: int = 1
    bb: set = 2         # pycharm高亮提示类型不匹配，不是错误
    cc: list = "abc"    # pycharm高亮提示类型不匹配，不是错误
    print(aa, bb, cc)

1 2 abc

if __name__ == ‘__main__‘:
    # a = _1000_000_0000  # 报错
    a = 1000_000_0000  #
    # a = 1000_000_0000_  #报错
    b = 0x_FF_FF_FF_FF  # 4294967295
    print(a, b)

10000000000 4294967295