enum是 Python 自 3.4 版本引入的内置模块,如果你使用的是更早的版本,可以通过pip install enum34来安装它。下面是使用 enum 的样例代码: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 #-*-coding:utf-8-*-fromenumimportIntEnumclassTripSource(IntEum):FROM_WEBSITE=11FROM_IOS_CLIENT=12defmark_trip...
week= Enum("Week", (["JAN", "TUE",... ])) 传入tuple元组 week = Enum("Week", ("JAN", "TUE")) 传入字典 week= Enum("Week", ({"JAN":"1", "TUE":"2"})) 传入string字符串 week= Enum("Week", "JAN TUE") 2)定义一个类,继承Enum class Week(Enum): JAN = 1 TUE = 2 2...
test="Python Programming"print("String: ",test)# First one character first_character=test[:1]print("First Character: ",first_character)# Last one character last_character=test[-1:]print("Last Character: ",last_character)# Everything except the first one character except_first=test[1:]print...
可以通过enum_ = Enum('class_name', names,start = 1)来创建,其中names可以是字符串,可以是列表/元组。内部定义为: 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 conta...
Python - Efficient String Concatenation in Python (2016 edition)blog.mclemon.io/python-efficient-string-concatenation-in-python-2016-edition 结语 以上就是『Python 工匠』系列文章的第三篇,内容比较零碎。由于篇幅原因,一些常用的操作比如字符串格式化等,文章里并没有涵盖到。以后有机会再写吧。 让我们最后...
class Enum(object): __slots__ = args.split() def __init__(self): for i, key in enumerate(Enum.__slots__, start): setattr(self, key, i) return Enum() e_dir = enum('up down left right') print e_dir.down # way5 # some times we need use enum value as string ...
enum PyUnicode_Kind { /* String contains only wstr byte characters. This is only possible when the string was created with a legacy API and _PyUnicode_Ready() has not been called yet. */ PyUnicode_WCHAR_KIND = 0, /* Return values of the PyUnicode_KIND() macro: */ PyUnicode_1BYTE...
@enum.unique 专用于枚举的 class 装饰器。 它会搜索一个枚举的 __members__ 并收集所找到的任何别名;只要找到任何别名就会引发 ValueError 并附带相关细节信息: >>> >>> from enum import Enum, unique >>> @unique ... class Mistake(Enum): ... ONE = 1 ... TWO = 2 ... THREE = 3 ...
use rusqlite::{Connection, ToSql};use std::sync::mpsc;use std::sync::mpsc::{Receiver, Sender};use std::thread;mod common;static MIN_BATCH_SIZE: i64 = 50;enum ParamValues {WithArea(Vec<(String, i8, i8)>),WithoutArea(Vec<(i8, i8)>),}fn consumer(rx: Receiver<ParamValues>) {let...
除了「format」,Python 3 还提供了一种通过「f-string」进行字符串插入的灵活方法。使用「f-string」编写的与上面功能相同的代码是这样的: user = "Jane Doe"action = "buy"log_message = f'User {user} has logged in and did an action {action}.'print(log_message)# User Jane Doe has logged in ...