在python中将一个列表插入另一个列表的语法是什么？
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What is the syntax to insert one list into another list in python?
提问by Compuser7
Given two lists:
给出两个列表：
x = [1,2,3]
y = [4,5,6]
What is the syntax to:
什么是语法：
- Insert
xintoysuch thatynow looks like[1, 2, 3, [4, 5, 6]]? - Insert all the items of
xintoysuch thatynow looks like[1, 2, 3, 4, 5, 6]?
- 插入
x到y这样y现在看起来像[1, 2, 3, [4, 5, 6]]？ - 插入的所有项目
x进入y，使得y现在的样子[1, 2, 3, 4, 5, 6]？
采纳答案by Paolo Bergantino
Do you mean append?
你的意思是append？
>>> x = [1,2,3]
>>> y = [4,5,6]
>>> x.append(y)
>>> x
[1, 2, 3, [4, 5, 6]]
Or merge?
还是合并？
>>> x = [1,2,3]
>>> y = [4,5,6]
>>> x + y
[1, 2, 3, 4, 5, 6]
>>> x.extend(y)
>>> x
[1, 2, 3, 4, 5, 6]
回答by Coding District
foo = [1, 2, 3]
bar = [4, 5, 6]
foo.append(bar) --> [1, 2, 3, [4, 5, 6]]
foo.extend(bar) --> [1, 2, 3, 4, 5, 6]
回答by Sergey
The question does not make clear what exactly you want to achieve.
这个问题并没有说明你到底想要达到什么目的。
List has the appendmethod, which appends its argument to the list:
List 有一个append方法，它将它的参数附加到列表中：
>>> list_one = [1,2,3]
>>> list_two = [4,5,6]
>>> list_one.append(list_two)
>>> list_one
[1, 2, 3, [4, 5, 6]]
There's also the extendmethod, which appends itemsfrom the list you pass as an argument:
还有一个extend方法，它从您作为参数传递的列表中附加项目：
>>> list_one = [1,2,3]
>>> list_two = [4,5,6]
>>> list_one.extend(list_two)
>>> list_one
[1, 2, 3, 4, 5, 6]
And of course, there's the insertmethod which acts similarly to appendbut allows you to specify the insertion point:
当然，还有一个insert方法类似于append但允许您指定插入点：
>>> list_one.insert(2, list_two)
>>> list_one
[1, 2, [4, 5, 6], 3, 4, 5, 6]
To extend a list at a specific insertion point you can use list slicing (thanks, @florisla):
要在特定插入点扩展列表，您可以使用列表切片（感谢，@florisla）：
>>> l = [1, 2, 3, 4, 5]
>>> l[2:2] = ['a', 'b', 'c']
>>> l
[1, 2, 'a', 'b', 'c', 3, 4, 5]
List slicing is quite flexible as it allows to replace a range of entries in a list with a range of entries from another list:
列表切片非常灵活，因为它允许用另一个列表中的一系列条目替换列表中的一系列条目：
>>> l = [1, 2, 3, 4, 5]
>>> l[2:4] = ['a', 'b', 'c'][1:3]
>>> l
[1, 2, 'b', 'c', 5]
回答by squal
If you want to add the elements in a list (list2) to the end of other list (list), then you can use the list extend method
如果你想把一个列表（list2）中的元素添加到另一个列表（list）的末尾，那么你可以使用列表扩展方法
list = [1, 2, 3]
list2 = [4, 5, 6]
list.extend(list2)
print list
[1, 2, 3, 4, 5, 6]
Or if you want to concatenate two list then you can use + sign
或者，如果您想连接两个列表，则可以使用 + 号
list3 = list + list2
print list3
[1, 2, 3, 4, 5, 6]
回答by user3707850
You can also just do...
你也可以只做...
x += y
回答by Raj Stha
If we just do x.append(y), y gets referenced into x such that any changes made to y will affect appended x as well. So if we need to insert only elements, we should do following:
如果我们只是这样做x.append(y)， y 就会被引用到 x 中，这样对 y 所做的任何更改也会影响附加的 x。所以如果我们只需要插入元素，我们应该这样做：
x = [1,2,3]
y = [4,5,6]
x.append(y[:])
x = [1,2,3]
y = [4,5,6]
x.append(y[:])
