给字符串加上标题框(带例外) [英] Titlecasing a string with exceptions

问题描述

Python中是否有一种标准的方式来对字符串加上大小写(即单词以大写字母开头，所有其余的大写字母都为小写字母)，但是却保留诸如and，in和of的文章为小写字母?

Is there a standard way in Python to titlecase a string (i.e. words start with uppercase characters, all remaining cased characters have lowercase) but leaving articles like and, in, and of lowercased?

推荐答案

这有一些问题.如果使用拆分和合并，则某些空格字符将被忽略.内置的大写和标题方法不会忽略空格.

There are a few problems with this. If you use split and join, some white space characters will be ignored. The built-in capitalize and title methods do not ignore white space.

>>> 'There     is a way'.title()
'There     Is A Way'

如果句子以文章开头，则不希望标题的第一个单词小写.

If a sentence starts with an article, you do not want the first word of a title in lowercase.

记住这些:

import re 
def title_except(s, exceptions):
    word_list = re.split(' ', s)       # re.split behaves as expected
    final = [word_list[0].capitalize()]
    for word in word_list[1:]:
        final.append(word if word in exceptions else word.capitalize())
    return " ".join(final)

articles = ['a', 'an', 'of', 'the', 'is']
print title_except('there is a    way', articles)
# There is a    Way
print title_except('a whim   of an elephant', articles)
# A Whim   of an Elephant

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