计算表格中的单词总数

Question

If i have a text file, containing:

Alex is a footballer
Alex loves football

and after reading the text file into a list in python, it outputs:

lst = [['Alex','is','a','footballer'],['Alex','loves','football']]

How do i count the number of words in the list? I'm thinking of something like:

count = 0
for word in lst:
    count += len(lst)

Output:

Total number of words: 7

Answer 1

You can also do sum(map(len,lst)) . More concise.

Answer 2

That works correctly if you want it to make more sense replace word with line. This is because list contains a list of lists(these smaller lists are one line of the text file).

Also if you don't want to do it in the python code, in terminal you can just write wc -w file.txt to see the number of words in that file.

Answer 3

Another canonical way is to use itertools.chain.from_iterable and sum 1 from each element.

import itertools

result = sum(1 for _ in itertools.chain.from_iterable(lst))
# equivalent to sum(1 for sublst in lst for el in sublst)

but your example code is fine.

Answer 4

您可以在一行中完成此操作：

total = sum([len(i) for i in lst])