Python列表直接修改

Question

lines = [["absb asdjhasd", "sadjhj sdhjsdh"], ["asjhjhad asdasd", " ashjhfdj asdasd"]]
for z in lines:
    for l in z:
        l = l.split()

print lines

我如何实现这些行现在包含分裂？似乎某处有副本？ Python 2.7

Answer 1

l.split()返回拆分结果而不影响原始字符串对象，l =仅重新绑定变量，而不是列表条目。

您也必须跟踪索引：

for z in lines:
    for index, l in enumerate(z):
        z[index] = l.split()

或者你可以使用nested list comprehension来重建字符串split：

lines = [[l.split() for l in z] for z in lines]

Answer 2

您可以使用它来将字符串替换为其分割

lines = [[l.split() for l in line] for line in lines]