Python 基础一（String 处理）
Python 里面 String的处理：1.基本的‘和“处理，不用多说，直接上例子：
>>> 'spam eggs'
'spam eggs'
>>> 'doesn\'t'
"doesn't"
>>> "doesn't"
"doesn't"
>>> '"Yes," he said.'
'"Yes," he said.'
>>> "\"Yes,\" he said."
'"Yes," he said.'
>>> '"Isn\'t," she said.'
'"Isn\'t," she said.'
2. String 对象可以被简单重复
>>> word = 'Help' + 'A'
>>> '<' + word*5 + '>'
'<HelpAHelpAHelpAHelpAHelpA>'
3.python的substring 比较好用。index是从0开始，像word
>>> word = 'Help' + 'A'
>>> word
'A'
>>> word
'He'
>>> word
'lp'
>>> word[:2] # The first two characters
'He'
>>> word # Everything except the first two characters
'lpA'
但对String里面的substring直接赋值却不行。
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