Python：如何将列表列表写入文本文件？

Question

我有一个列表列表如下：

list_of_list = [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]] 

我想file.txt用下面的格式把它写下来。

1 2 3
4 5 6
7 8 9
10 11 12

请注意，逗号和括号不在file.txt. 我试图压平list_of_list并写入，file.txt但得到以下输出：

1
2
3
etc.

Answer 1

尝试这个：

lst = [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]]

text = '\n'.join([' '.join([str(j) for j in i]) for i in lst])

with open("file.txt", "w") as file:
    file.write(text)

file.txt：

1 2 3
4 5 6
7 8 9
10 11 12

Answer 2

with open('file.txt', 'w') as f:
    for lst in list_of_list:
        print(*lst, file=f)