给定一个英文句子（一个只有字母的字符串），将句中所有单词变为有且只有首字母大写

def cap_string1(sentence):
    sentence=' '.join([i.capitalize() for i in sentence.split()])
    return sentence

def cap_string2(sentence):
　　 return sentence.title()

s='''Python is a programming language that lets you work quickly and integrate systems more effectively'''     
print cap_string1(s)
print cap_string2(s)

输出：

Python Is A Programming Language That Lets You Work Quickly And Integrate Systems More Effectively