normal_list = [1, 2, 3, 4, 5]class CustomSequence:def __len__(self):return 5def __getitem__(self, index):return f"x{index}"class FunkyBackwards:def __reversed__(self):return "BACKWARDS!"for seq in normal_list, CustomSequence(), FunkyBackwards():print(f"\n{seq.__class__.__...
Out[51]: A(a=1, b=2, c=B(d=7, e=8)) In [54]: A._fields# 查看元组类的字段Out[54]: ('a','b','c') In [68]: a1._asdict()# 将具名元组以 collections.OrderedDict 的形式返回,注意普通元组没有这个方法Out[68]: OrderedDict([('a',1), ('b',2), ('c', B(d=7, e=...
defone(func):print("now you are in function one.")defwarp():func()returnwarp@onedeft...
没有py文件导入模块执行导入的模块,而导入一个包默认执行包里的init.py文件,没有执行里面包里的其他py文件如果想import一个包glance就能使用glance文件里的所有模块执行包里面的全部的py文件,需要在glance的init里面把下面几个包和文件再导入进来,然后再在最底层的文件夹impot导入文件如果是py2版本,没有init不能从gla...
因为itemgetter 使用[] 运算符,它不仅支持序列,还支持映射和任何实现 __getitem__ 的类。 itemgetter 的姐妹是 attrgetter,它通过名称创建提取对象属性的函数。如果将多个属性名称作为参数传递给 attrgetter,它还会返回一个值元组。此外,如果任何参数名称包含 .(点),attrgetter 将浏览嵌套对象以检索属性。这些行为在 示...
self.name,self.course)classStuList:def__init__(self,data):self.data=data[:]def__getitem_...
def __class_getitem__(cls, params): if not isinstance(params, tuple): params = (params,) # 中间省略大部分内容,都是为了组装 params return _GenericAlias(cls, params, _paramspec_tvars=True) 1. 2. 3. 4. 5. 6. 7. 显而易见,就是将[]中的泛型参数传了进来,并实例化了_GenericAlias对象,...
Arguments Results product() p, q, … [repeat=1] cartesian product, equivalent to a nested for-loop permutations() p[, r] r-length tuples, all possible orderings, no repeated elements combinations() p, r r-length tuples, in sorted order, no repeated elements combinations_with_replacement...
The table must implement lookup/indexing via __getitem__, for instance a dictionary or list, mapping Unicode ordinals to Unicode ordinals, strings, or None. If this operation raises LookupError, the character is left untouched. Characters mapped to None are deleted. """ return "" 1. 2. ...
test = [1, 3, 5, 7] print(dir(test)) :['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__', '__iadd__'...