2019-03-03 大写，小写，首字母大写，去空格

大写，小写，首字母大写

word="Hello Eric, would you like to learn some Python today?"

print(word)

print(word.upper())

print(word.lower())

print(word.title())

去空格

word=" Hello Eric "

print(word)

print(word.lstrip())

print(word.rstrip())

print(word.strip())