Welcome to the sixth installment of the How to Python series. Today, we’re going to learn how to clone or copy a list in Python. Unlike most articles in this series, there are actually quite a few options—some better than others. ...
Use the copy() methodYou can use the built-in List method copy() to copy a list.ExampleGet your own Python Server Make a copy of a list with the copy() method: thislist = ["apple", "banana", "cherry"]mylist = thislist.copy() print(mylist) Try it Yourself » ...
However, this still does not copy all inner elements for nested Lists! We only created a so-calledshallow copy. Let's say we have a List of Lists. If we make a copy with one of the above methods and change the inner elements, it still affects the other List as well: a=[[1,2],...
Python lists are powerful data structures used to store a collection of items. The copy list method is important when handling data since it helps preserve the original list while performing operations on the duplicated one. In this tutorial, I will explain the basic and advanced techniques of ...
list.copy()Return a shallow copy of the list. Equivalent to a[:].返回一个列表的镜像，等效于a[:]。An example that uses most of the list methods:下面是这些方法的实例：>>> fruits = ['orange', 'apple', 'pear', 'banana', 'kiwi', 'apple', 'banana']>>> fruits.count('apple')2 >...
Python中 copy, deepcopy 的区别及原因 # copy.copy 浅拷贝 只拷贝父对象,不会拷贝对象的内部的子对象。 **只是简单的指针赋值 # copy.deepcopy 深拷贝 拷贝对象及其子对象 **指针赋值,且内容拷贝 用一个简单的例子说明如下: >>>importcopy>>>a = [1, 2, 3, 4, ['a','b','c']]>>> b =a>...
s.copy(),本质上就相当于 s[:] python >>> list1 = ["Karene","and",19] >>> list2 = list1[:] >>> list1[1] = "or" >>> list1 ["Karene","or",19] >>> list2 ["Karene","and",19] s.clear() 只要出现,接下来的序列s就是空序列 python >>> list1 = ["Karene","pitay...
append(' ') # Add a dead cell. nextCells.append(column) # nextCells is a list of column lists. while True: # Main program loop. print('\n\n\n\n\n') # Separate each step with newlines. currentCells = copy.deepcopy(nextCells) # Print currentCells on the screen: for y in ...
(1)copy.copy(x) 浅拷贝其实就是用的切片操作 (2)完全切片法[:] (3)工厂函数,如list() 注意:浅拷贝中,对于不可变对象,拷贝后等于新创建对象,id值各不相同,也就是说对于非容器类型,没有拷贝一说;对于可变对象,拷贝仅相当于新增一个引用,id值不变,对一个变量进行修改会影响到其余变量。
['z', 23]]在这里,变量list_of_lists,copy_lol指向了两个不同的对象,所以我们可以修改它们任何一个, 而不影响另外一个.然而,如果我们修改了一个对象中的元素,那么另一个也会受影响,因为它们中的元素还是共享引用. 如果你希望复制一个容器对象,以及它里面的所有元素(包含元素的子元素),使用copy.deepcopy,...