在 Python 3 中连接列表
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Concatenating lists in Python 3
提问by Ci3
I'm reading Dive into Python 3and at the section of lists, the author states that you can concatenate lists with the "+" operator or calling the extend() method. Are these the same just two different ways to do the operation? Any reason I should be using one or the other?
我正在阅读Dive into Python 3并且在列表部分，作者指出您可以使用“+”运算符连接列表或调用 extend() 方法。这些只是两种不同的操作方式吗？我应该使用其中一个的任何理由？
>>> a_list = a_list + [2.0, 3]
>>> a_list.extend([2.0, 3])
采纳答案by Blckknght
a_list.extend(b_list)modifies a_listin place. a_list = a_list + b_listcreates a new list, then saves it to the name a_list. Note that a_list += b_listshould be exactly the same as the extendversion.
a_list.extend(b_list)a_list就地修改。a_list = a_list + b_list创建一个新列表，然后将其保存到 name a_list。注意a_list += b_list应该和extend版本完全一样。
Using extendor +=is probably slightly faster, since it doesn't need to create a new object, but if there's another reference to a_listaround, it's value will be changed too (which may or may not be desirable).
使用extendor+=可能稍微快一点，因为它不需要创建一个新对象，但是如果有另一个对a_listaround的引用，它的值也会改变（这可能是也可能不是可取的）。
