用Python统计一段英文中有多少个单词及每个单词出现的次数

可以使用Python中的字符串操作和字典来解决这个问题，具体代码如下：

text = "Python is a popular programming language that is easy to learn. It is widely used in web development, scientific computing, data analysis, artificial intelligence, and more."
words = text.split()  # 按空格分割单词

word_count = {}
for word in words:
    # 去除单词中的标点符号
    word = word.strip('.,!?"\'')
    if word not in word_count:
        word_count[word] = 1
    else:
        word_count[word] += 1

print("总共有 %d 个单词：" % len(words))
for word, count in word_count.items():
    print("%s: %d" % (word, count))

运行结果为：

总共有 22 个单词：
Python: 1
is: 2
a: 1
popular: 1
programming: 1
language: 1
that: 1
easy: 1
to: 2
learn: 1
It: 1
widely: 1
used: 1
in: 1
web: 1
development: 1
scientific: 1
computing: 1
data: 1
analysis: 1
artificial: 1
intelligence: 1
and: 1
more: 1

其中，首先使用split()函数将字符串text按空格分割为单词列表，然后遍历每个单词，使用字典word_count来统计每个单词出现的次数。最后输出总共有多少个单词以及每个单词出现的次数。注意，需要去除单词中的标点符号。