如何在Python中将文件中的每一行逐字读取到列表中

Question

I'm trying to read line into a list where each word on that line is different argument. For example when my text file contains:

Word1, Word2, Some different words,separated by comma,but no space
Word3, Word4, Some different words,separated by comma,but no space

I would like to get lists like that:

['Word1', 'Word2', 'Some different words,separated by comma,but no space'],
['Word3', 'Word4', 'Some different words,separated by comma,but no space']

Maybe I can even get list like this:

['Word1', 'Word2', 'Some different words','separated by comma', 'but no space']

So far I've managed to get this work when there is one line in text file by reading each word into list.

list_words = f.read().split()

It gives me output:

['Word1', 'Word2', 'Some different words,separated by comma,but no space']

How could I do this when I have multiple lines? Also if I later want to print out first arguments from both lists, can I use list_words[0] and it will give me automatically 'Word1' and 'Word3' ?

I hope this explanation was clear enough.

Answer 1

您可以使用以下列表理解

list_words = [i.split(',') for i in f]

Answer 2

If you want to split with a comma followed by a space, you could use re.split :

>>> with open('f.txt') as f:
...   print [re.split(', ',line) for line in f]
...
[['Word1', 'Word2', 'Some different words,separated by comma,but no space\n'],
 ['Word3', 'Word4', 'Some different words,separated by comma,but no space\n']]

If you want to split on every comma, just use str.split:

>>> with open('f.txt') as f:
...   print [line.split(',') for line in f]
...
[['Word1', ' Word2', ' Some different words', 'separated by comma', 'but no space\n'],
 ['Word3', ' Word4', ' Some different words', 'separated by comma', 'but no space\n']]

you can use strip to get rid of the \\n :

>>> with open('f.txt') as f:
...   print [line.strip().split(',') for line in f]
...   # or print [re.split(', ',line.strip()) for line in f]
...
[['Word1', ' Word2', ' Some different words', 'separated by comma', 'but no space'],
 ['Word3', ' Word4', ' Some different words', 'separated by comma', 'but no space']]

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In fact, you can also use line.strip().split(', ') . I just forgot that you can have a delimiter of more than 1 character…