使用python排序词频计数 [英] Sorted Word frequency count using python

问题描述

我必须使用 python 计算文本中的词频.我想把单词存入字典，并对每个单词进行计数.

现在，如果我必须根据出现次数对单词进行排序.我可以用同一个字典来做，而不是使用一个新的字典，它的键是计数，单词数组是值吗?

解决方案

可以使用同一个字典:

<预><代码>>>>d = { "foo": 4, "bar": 2, "quux": 3 }>>>sorted(d.items(), key=lambda item: item[1])

第二行打印:

[('bar', 2), ('quux', 3), ('foo', 4)]

如果您只想要一个排序的单词列表，请执行以下操作:

<预><代码>>>>[pair[0] for pair in sorted(d.items(), key=lambda item: item[1])]

该行打印:

['bar', 'quux', 'foo']

I have to count the word frequency in a text using python. I thought of keeping words in a dictionary and having a count for each of these words.

Now if I have to sort the words according to # of occurrences. Can i do it with same dictionary instead of using a new dictionary which has the key as the count and array of words as the values ?

解决方案

You can use the same dictionary:

>>> d = { "foo": 4, "bar": 2, "quux": 3 }
>>> sorted(d.items(), key=lambda item: item[1])

The second line prints:

[('bar', 2), ('quux', 3), ('foo', 4)]

If you only want a sorted word list, do:

>>> [pair[0] for pair in sorted(d.items(), key=lambda item: item[1])]

That line prints:

['bar', 'quux', 'foo']

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