在文本中查找新插入的单词

Question

我想用Python查找插入到文本文件中的生词。例如：

Old: He is a new employee here.
New: He was a new, employee there.

我想要这个单词列表作为输出：['was', ',' ,'there']

我使用了difflib，但是它用'+', '-' and '?'以一种格式错误的方式给出了差异。我必须解析输出才能找到新词。有没有一种简单的方法可以在Python中实现这一点？你知道吗

Answer 1

我用了googlediff补丁匹配。很好用。你知道吗

Answer 2

您可以使用^{}模块来实现这一点。你知道吗

import re

# create a regular expression object
regex = re.compile(r'(?:\b\w{1,}\b)|,')

# the inputs
old = "He is a new employee here."
new = "He was a new, employee there."

# creating lists of the words (or commas) in each sentence
old_words = re.findall(regex, old)
new_words = re.findall(regex, new)

# generate a list of words from new_words if it isn't in the old words
# also checking for words that previously existed but are then added
word_differences = []
for word in new_words:
    if word in old_words:
        old_words.remove(word)
    else:
        word_differences.append(word)

# print it out to verify
print word_differences

请注意，如果要添加其他标点符号（如bang或分号），则必须将其添加到正则表达式定义中。现在，它只检查单词或逗号。