no pain, no gain, where there is a will, there is a way 如何用python算词的频次

要用 Python 算出一段文本中每个单词出现的频次，可以按照如下步骤进行：

1. 将文本中的所有单词提取出来，并且将它们全部转换成小写字母，方便后续统计。

可以使用正则表达式对文本进行分词，代码如下：

import re

text = "No pain, no gain. Where there is a will, there is a way."
words = re.findall(r'\b\w+\b', text.lower())

2. 遍历单词列表，统计每个单词出现的次数。

可以使用一个字典来存储每个单词出现的次数，代码如下：

word_freq = {}
for word in words:
    if word in word_freq:
        word_freq[word] += 1
    else:
        word_freq[word] = 1

3. 输出每个单词和它的频次。

可以使用一个循环遍历字典中的每一项，依次输出单词和它的频次，代码如下：

for word, freq in word_freq.items():
    print(f"{word}: {freq}")

完整代码如下：

import re

text = "No pain, no gain. Where there is a will, there is a way."
words = re.findall(r'\b\w+\b', text.lower())

word_freq = {}
for word in words:
    if word in word_freq:
        word_freq[word] += 1
    else:
        word_freq[word] = 1

for word, freq in word_freq.items():
    print(f"{word}: {freq}")