from enum import Enum Season = Enum('Season', ['SPRING', 'SUMMER', 'AUTUMN', 'WINTER'], start=5) for season in Season: print(season) for season in Season: print(season.name, season.value) In this example, we create aSeasonenum where the values are set in a list of strings. for...
python from enum import Enum class A(Enum): a=1 b=2 c=3 """ 继承Enum基类后一个枚举类中key不能相同 如果希望value也不同可以导入unique """ @unique class A(Enum): a=1 b=2 c=3 闭包 防止局部变量污染全局变量 nonlocal 获取上层作用域的某个变量值 难以追踪 生成器(yield) 生成器是迭代器...
def _create_(cls, class_name, names, *, module=None, qualname=None, type=None, start=1): """Convenience method to create a new Enum class. `names` can be: * A string containing member names, separated either with spaces or commas. Values are incremented by 1 from `start`. * An ...
from enum import Enum, unique @unique class VehicleType(Enum): CAR = 1 TRUCK = 2 MOTORCYCLE = 3 BUS = 4 # Attempting to create an enumeration with a duplicate value will raise a ValueError try: @unique class DuplicateVehicleType(Enum): CAR = 1 TRUCK = 2 MOTORCYCLE = 3 # BUS and M...
这是我的代码: // c++ (main.cpp) #include <vector> #include <iostream> #include <boost/python.hpp> #include <boost/python/enum.hpp> #include <boost/python/def.hpp> #include <boost/python/module.hpp> using namespace std; using namespace boost; using namespace boost::pyth 浏览4提...
The Enum class is a callable class, hence you can use its constructor to create an enumeration. This constructor accepts two arguments, which are the name of enumeration and a string consisting of enumeration member symbolic names separated by a whitespace.Example...
raise from iteritems移除变成items() yield from 链接子生成器 asyncio,async/await原生协程支持异步编程 新增enum, mock, ipaddress, concurrent.futures, asyncio urllib, selector 不同枚举类间不能进行比较 同一枚举类间只能进行相等的比较 枚举类的使用(编号默认从1开始) ...
fabmp:srv fab$# step 1 - create folderfabmp:srv fab$ mkdir learn.pp fabmp:srv fab$ cd learn.pp fabmp:learn.pp fab$# step 2 - create virtual environmentfabmp:learn.pp fab$ which python3.7/Users/fab/.pyenv/shims/python3.7fabmp:learn.pp fab$ virtualenv -p ...
问题现象五:MaxCompute UDF引用Python 3的标准库时,运行报错描述为ImportError: No module named enum。 产生原因:MaxCompute项目未开启Python 3,默认使用Python 2环境运行MaxCompute UDF,无法识别Python 3的标准库。 解决措施:在调用MaxCompute UDF的SQL语句前增加set odps.sql.python.version=cp37;与SQL语句一起提交执...
2. Types: Type, String, Regular_Exp, Format, Numbers, Combinatorics, Datetime. 3. Syntax: Args, Inline, Import, Decorator, Class, Duck_Types, Enum, Exception. 4. System: Exit, Print, Input, Command_Line_Arguments, Open, Path, OS_Commands. 5. Data: JSON, Pickle, CSV, SQLite, Bytes,...