Python - typing 模块 —— 类型别名

前言

typing 是在 python 3.5 才有的模块

 

前置学习

Python 类型提示:https://www.cnblogs.com/poloyy/p/15145380.html

 

常用类型提示

https://www.cnblogs.com/poloyy/p/15150315.html

 

类型别名

可以将复杂一点类型给个别名,这样好用一些

 

变量栗子

# 别名
vector = List[float]

var: vector = [1.1, 2.2]
# 等价写法
var: List[float] = [1.1, 2.2]

 

函数栗子

# float 组成的列表别名
vector_list_es = List[float]
# 字典别名
vector_dict = Dict[str, vector_list_es]
# 字典组成列表别名
vector_list = List[vector_dict]

# vector_list 等价写法,不用别名的话,有点像套娃
vector = List[Dict[str, List[float]]]

# 函数
def scale(scalar: float, vector: vector_list) -> vector_list:
    for item in vector:
        for key, value in item.items():
            item[key] = [scalar * num for num in value]
    print(vector)
    return vector


scale(2.2, [{"a": [1, 2, 3]}, {"b": [4, 5, 6]}])


# 输出结果
[{'a': [2.2, 4.4, 6.6000000000000005]}, {'b': [8.8, 11.0, 13.200000000000001]}]

 

更接近实际应用的栗子

# 更接近实际应用的栗子
ConnectionOptions = Dict[str, str]
Address = Tuple[str, int]
Server = Tuple[Address, ConnectionOptions]


def broadcast_message(message: str, servers: Server) -> None:
    print(message, servers)


message = "发送服务器消息"
servers = (("127.0.0.1", 127), {"name": "服务器1"})
broadcast_message(message, servers)


# 输出结果
发送服务器消息 (('127.0.0.1', 127), {'name': '服务器1'})

 

NewType

https://www.cnblogs.com/poloyy/p/15153886.html 

 

Callable

https://www.cnblogs.com/poloyy/p/15154008.html

 

TypeVar 泛型

https://www.cnblogs.com/poloyy/p/15154196.html

 

Any Type

https://www.cnblogs.com/poloyy/p/15158613.html

 

Union

https://www.cnblogs.com/poloyy/p/15170066.html

 

Optional

https://www.cnblogs.com/poloyy/p/15170297.html

posted @ 2021-08-18 20:11  小菠萝测试笔记  阅读(216)  评论(0编辑  收藏  举报