python - 如何将列表列表附加到一个列表中

我的列表= [['A B'，'A B C'，'A B C D']，['C'，'D E F'，'A B']]

如何获得类似以下的列表：myli = [['A'，'B'，'A'，'B'，'C'，'A'，'B'，'C'，'D']，[ 'C'，'D'，'E'，'F'，'A'，'B']]

这是我的代码：

x = []
myli = []

for item in Mylists:
    for i in range(len(item)):
        x.extend(item[i].split())
    myli.append(x)

最佳答案

您需要在外部forloop中初始化x。

您的密码

Mylists = [['A B','A B C','A B C D'],['C','D E F','A B']]
x = []
myli = []

for item in Mylists:
    for i in range(len(item)):
        # BUG: since x is not reinitialized, it contains the same old
        # memory address that was appended to myli
        # extending x means you are modifying the x that you previously appended to myli
        # infact, every appended x is the same x !
        x.extend(item[i].split())

    # appending the same old x, which will inevitably be modified
    # in the next iteration
    myli.append(x)

更正

Mylists = [['A B','A B C','A B C D'],['C','D E F','A B']]
myli = []

for item in Mylists:
    x = [] # reinitialize x
    for i in range(len(item)):
        x.extend(item[i].split())
    myli.append(x)