python的枚举类 Enum #枚举 from enum import Enum,unique #1、默认枚举类 Month = Enum('Month',('Jan','Feb','Mar')) for name,member in Month.__members__.items(): print(name,'=>',member,',',member.value) #value属性是自动赋给成员
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...
class Weekday(Enum): File "/usr/lib/python3.4/enum.py", line 524, in unique (enumeration, alias_details)) ValueError: duplicate values found in <enum 'Weekday'>: tusday -> monday 1. 2. 3. 4. 5. 6. 4.有人也在想,我就是不改咋地!我能不能通过另一个方法把成员都打印出来?于是:_...
Yes: result=[mapping_exprforvalueiniterableiffilter_expr]result=[{'key':value}forvalueiniterableifa_long_filter_expression(value)]result=[complicated_transform(x)forxiniterableifpredicate(x)]descriptive_name=[transform({'key':key,'value':value},color='black')forkey,valueingenerate_iterable(some_...
Typical usage example: foo = ClassFoo() bar = foo.FunctionBar() """ 3.8.3 函数和方法 在本节,"函数"所指包括方法,函数或者生成器. 函数应有文档字符串,除非符合以下所有条件: 外部不可见 非常短 * 简明 文档字符串应该包含足够的信息以在无需阅读函数代码的情况下调用函数.文档字符串应该是叙事体(""...
Mimesis是一个用于Python的高性能伪数据生成器,它以各种语言为各种目的提供数据。 模拟-假数据发生器 Description Mimesis是一个用于Python的high-performance伪数据生成器,它用各种语言为各种目的提供数据。这些假数据可以用来填充测试数据库,创建假API端点,创建任意结构的JSON和XML文件,匿名化从生产中获取的数据等等。
Usage e.g.:~/DragonPy$ ./cli.py run ~/DragonPy$ ./cli.py editorROMsAll needed ROM files, will be downloaded automatically.The files will be downloaded from:Machinedownload url Dragon 32 + 64 http://archive.worldofdragon.org/archive/index.php?dir=Software/Dragon/Dragon%20Data%20Ltd/...
Usage example: importrbqlinput_table=[ ['Roosevelt',1858,'USA'], ['Napoleon',1769,'France'], ['Dmitri Mendeleev',1834,'Russia'], ['Jane Austen',1775,'England'], ['Hayao Miyazaki',1941,'Japan'], ]user_query='SELECT a.name, "birth century: {}".format(a.DOB // 100 + 1) WHERE...
Perl’s keywords are unique and quite different from many of the popular languages. This adds an additional barrier to learning the language for existing programmers. Raku will likely become popular among existing Perl programmers who need the additional flexibility that Perl can’t give them, so ...
python enum和unique from enum importEnum,unique@uniqueclassWeekday(Enum):Sun=0# Sun的value被设定为0Mon=1Tue=2Wed=3Thu=4Fri=5Sat=6>>>day1=Weekday.Mon>>>print(day1)Weekday.Mon>>>print(Weekday.Tue)Weekday.Tueforname,memberinWeekday.__members__.items():...print(name,'=>',member)...