如何在文本文件中查找单词？

Question

I am writing a Python program to which I need to count how many of each word there are in a text file.

def count_words(word,d):
    for l in word:
        if l in d:
            d[l] += 1
        else:
            d[l] = 1
        return d

def count_letters():
    d = dict()
    word_file = open('w.txt')
    for line in word_file:
        word = line.strip();
        d = count_words(word,d)
    return d

Answer 1

You can easily get away with reverse sorting on one condition and forward sorting on another if one of them is an int by negating the int in the key func

replace

freq_list.sort()

with

freq_list.sort(key=lambda x:(-x[1], x[0]))

In the more general case, since Python's sort is stable you can sort by the second key and then the first

freq_list.sort(key=lambda x:x[0])
freq_list.sort(key=lambda x:x[1], reverse=True)

The disadvantage is that you need to do two sorts, so it's a little slower