Out[2]: list # 初始化list,list 中的元素没有类型要求,可以是任何类型 In [3]: li = [1,2,'a',['a',4]] In [4]: li Out[4]: [1, 2, 'a', ['a', 4]] 1.2列表的下标 python中列表的下标是从0开始的。 In [4]: li Out[4]: [1, 2, 'a', ['a', 4]] In [5]: li[...
print(dir(list)) ['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__', '__iadd__', '__imul__', '__init_...
__index__','__init__','__int__','__invert__','__long__','__lshift__','__mod__','__mul__','__neg__','__new__','__nonzero__','__oct__','__or__','__pos__','__pow__','__radd__','__rand__','__rdiv__','__rdivmod__','__reduce__','__redu...
>>>dir(list)['__add__','__class__','__contains__','__delattr__','__delitem__','__delslice__','__doc__','__eq__','__format__','__ge__','__getattribute__','__getitem__','__getslice__','__gt__','__hash__','__iadd__','__imul__','__init__','_...
>>>dir(list) ['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__', '__iadd__', '__imul__', '__init__'...
list-__init__()+append()+extend()+insert()+remove()+pop()+clear()+index()+count()+sort()+reverse()+copy() 总结 本文介绍了三种常用的方法来判断一个Python对象是否是list,包括使用type()函数、使用isinstance()函数和使用内置函数。无论使用哪种方法,判断对象是否是list都非常简单。在实际编程中,我...
list就有__iter__方法。如果调用此方法,则会返回一个迭代器 >>> it = list.__iter__() >>> it <listiterator object at 0x10fa12950> >>> dir(it) ['__class__', '__delattr__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__iter__', '_...
def __init__(self): self.books = [] # 添加 def add_book(self, book): self.books.append(book) # 添加新属性 def modify_book(self, ISBN, key, value): for book in self.books: if book.ISBN == ISBN: setattr(book, key, value) ...
PikaList aht20_v0.0.1_1691157584014 asdff_v0.0.1_1690007212815 a_v1.2.3_1690006660253 asdf_v1.2.3_1690005830889 PikaStdDevice_v3.0.0_1690005416063 test_v0.0.1_1690005040119 STM32F4_v0.1.3_1689918473376 packer builtins test_v1.1.1_1684485608559 v1.13.4 v1.13.3 v1.13.0 v1.12.5 v1.12.4 ...
empty_list := [] #InValid 如上所示,我们不能将=运算符与:=运算符一起使用,walrus 运算符只能是表达式的一部分。 2. 加减运算 a += 5 #Valid a :+=5 # Invalid 3. lambda 函数中的赋值表达式 (lambda: a:= 5) # Invalid lambda: (a := 5) # Valid, but not useful (var := lambda: 5...