1.引入模块报错 from collections import Iterator,Iterable 报错: DeprecationWarning: Usingorimporting the ABCsfrom'collections'instead offrom'collections.abc'isdeprecated,andin3.8it will stop workingfromcollectionsimportIterator,Iterable 2.修改为: from collections.abc import Iterator,Iterable 善战者,求之于势,...
关于下面代码,描述错误的是: from collections import Iterable from collections import Iterator r = range(10) print(isinstance(r, Iterable)) print(isinstance(r, Iterator)) l = list(r) print(l) t = tuple(r) print(t) A. range对象r是一个可迭代对象 B. range对象r不是一个迭代器 ...
from collections.abc import Iterable, Iterator, Generator isinstance(obj, Iterable) # 可迭代对象 isinstance(obj, Iterator) # 迭代器 isinstance(obj, Generator) # 生成器 Iterable:一般在python中想字符串,list, dict, tuple, set, deque等都是可迭代对象,从表象上看他们都可以使用 for 来循坏迭代,但实际...
方法是通过collections模块的Iterable类型判断from collections importIterable#导入collections模块的Iterable类型n=isinstance...这些可以直接作用于for循环的对象统称为可迭代对象:Iterable#可以使用isinstance()判断一个对象是否是Iterable对象from collections import Iterablem...、str等是Iterable但不是Iterator,不过可以通过...
Type"help","copyright","credits"or"license"formore information.>>>fromcollectionsimportIterable<stdin>:1:DeprecationWarning:Usingorimporting the ABCsfrom'collections'instead offrom'collections.abc'isdeprecated since Python3.3,andin3.10it will stop working ...
代码如下:import collections from collections.abc import Iterable.Iterator.Generator #字符串 ast="xiaoming" print("字符串:{}".format(ast)) print(isinstarnce(ast,Iterable)) print(isinstance(ast,Iterator)) print(isinstance(alist,Generator))
方法是通过collections模块的Iterable类型判断from collections import Iterable #导入collections模块的Iterable类型n=isinstance 这些可以直接作用于for循环的对象统称为可迭代对象:Iterable#可以使用isinstance()判断一个对象是否是Iterable对象from collections import Iterablem 、str等是Iterable但不是Iterator,不过可以通过iter(...
abc import Mapping 如果你仍然想使用’Mapping’,你可以从内置的’types’模块中导入它: from types import MappingType as Mapping 另外,如果你想创建一个Mapping类型的实例,你可以使用collections.abc模块中的其他抽象基类,例如’Sized’, ‘Iterable’, ‘Container’, ‘Callable’, ‘Hashable’, ‘Iterator’, ...
importrandom# 当你不确定你要用到什么fromrandomimportrandint# 当你确定你要用到的东西fromurllib.requestimporturlopen# 导入单个urlopen(url)fromcollectionsimportIterable, Iterator# 导入多个内容fromabcimportABCMeta, abstractmethodprint(globals())print(randint(1,10))fromyitianimportmain_person_manasnanzhujue# 对...