尽管所有的答案都是令人满意的，但我将尝试涵盖两个额外的情况以及所有前面的情况。

如果空间不均匀，你想保持不变

string = hello    world i  am    here.

如果所有的字符串不是从字母开始

string = 1 w 2 r 3g

在这里你可以使用这个:

def solve(s):
    a = s.split(' ')
    for i in range(len(a)):
        a[i]= a[i].capitalize()
    return ' '.join(a)

这将给你:

output = Hello    World I  Am    Here
output = 1 W 2 R 3g

大写的单词…

str = "this is string example....  wow!!!";
print "str.title() : ", str.title();

@Gary02127评论，下面的解决方案适用于带有撇号的标题

import re

def titlecase(s):
    return re.sub(r"[A-Za-z]+('[A-Za-z]+)?", lambda mo: mo.group(0)[0].upper() + mo.group(0)[1:].lower(), s)

text = "He's an engineer, isn't he? SnippetBucket.com "
print(titlecase(text))

在Python中，您可以使用title()方法将字符串中的每个单词大写:

string = "this is a test string"
capitalized_string = string.title()
print(capitalized_string)

输出:

This Is A Test String

使用非均匀空格将字符串大写

我想补充一下@Amit Gupta关于非均匀空间的观点:

从最初的问题中，我们想要大写字符串s = 'the brown fox'中的每个单词。如果字符串s = 'the brown fox'有不均匀的空格。

def solve(s):
    # If you want to maintain the spaces in the string, s = 'the brown      fox'
    # Use s.split(' ') instead of s.split().
    # s.split() returns ['the', 'brown', 'fox']
    # while s.split(' ') returns ['the', 'brown', '', '', '', '', '', 'fox']
    capitalized_word_list = [word.capitalize() for word in s.split(' ')]
    return ' '.join(capitalized_word_list)

.title()方法不能很好地工作，

>>> "they're bill's friends from the UK".title()
"They'Re Bill'S Friends From The Uk"

试试string.capwords()方法，

import string
string.capwords("they're bill's friends from the UK")
>>>"They're Bill's Friends From The Uk"

来自Python capwords文档:

使用str.split()将参数拆分为单词，使用str.capitalize()将每个单词大写，并使用str.join()连接大写的单词。如果可选的第二个参数sep不存在或为None，则空白字符的运行将被单个空格替换，并且前导和尾部的空白将被删除，否则sep用于分隔和连接单词。

如果str.title()对您不起作用，请自己大写。

将字符串拆分为单词列表 每个单词的第一个字母大写 把单词连接成一个字符串

一行程序:

>>> ' '.join([s[0].upper() + s[1:] for s in "they're bill's friends from the UK".split(' ')])
"They're Bill's Friends From The UK"

明显的例子:

input = "they're bill's friends from the UK"
words = input.split(' ')
capitalized_words = []
for word in words:
    title_case_word = word[0].upper() + word[1:]
    capitalized_words.append(title_case_word)
output = ' '.join(capitalized_words)