python如何将列表列表写入文件 [英] python how to write list of lists to file

问题描述

我正在尝试将字符串列表列表写入文件. 我的大清单是有名无实的:

I am trying to write a list of lists of strings to a file. My big list is of the forme:

 1.0 '0:25.0' '1:50.0' '2:131.0' '3:202.0'
 1.0 '0:2.0'  '1:36.0' '2:131.0' '3:188.0'
-1.0 '0:56.0' '1:53.0' '2:55.0'  '3:58.0'
-1.0 '0:50.0' '1:51.0' '2:48.0'  '3:55.0'  
 and so on ... 

第一列的类型为int，其余的类型为str.

the first column is of type int and the remaining are of type str.

我尝试了以下代码:

f = open('dataset', 'w')
for i in range(len(mylist[0]):
     f.write(str(item) for item in mylist[i])
f.close()

但是出现以下错误:

TypeError: expected a character buffer object

上述代码(f.write(...))的第3行中发生了错误

the error occured in line 3 of the above code (f.write(...))

我尝试过:

 with open("train_data.csv", 'w') as f:
     writer = csv.writer(f)
     writer.writerows(listdata)

但是，令人惊讶的是，对于以-1.0开头的行，我只得到1st 31个元素(每行(列表)包含362个元素).我不知道为什么会这样.

But, surprisingly, for lines starting with -1.0 I only get the 1st 31 elements ( each line (list) contains 362 elements). I have no idea why this is happening.

推荐答案

我会这样.

from __future__ import with_statement

mylist = [[1.0,'0:25.0','1:50.0'],[-1.0,'0:56.0','1:53.0']] # as example

with open('output.txt', 'w') as f:
    for _list in mylist:
        for _string in _list:
            #f.seek(0)
            f.write(str(_string) + '\n')

结果，我在output.txt中得到了它:

As a result, I get this in output.txt:

1.0
0:25.0
1:50.0
-1.0
0:56.0
1:53.0

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