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     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。

请记住以下几点：

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