SICP-2.2-String

字符串

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• Python中文本值叫做string，构造函数为str
• 形式为内容被单引号或双引号包含
  
  • 多行文本值为三引号包含文本内容

>>> 'I am string!'
'I am string!'
>>> "I've got an apostrophe"
"I've got an apostrophe"
>>> '您好'
'您好'

>>> """The Zen of Python
claims, Readability counts.
Read more: import this."""
'The Zen of Python\nclaims, "Readability counts."\nRead more: import this.'

• string符合前面提到的序列的两个特性
  
  • 它有长度
  • 它有元素选择器
• 和序列相同，Python支持操作符操作
• 字符串构造器——str()

>>> str(2) + ' is an element of ' + str(digits)
'2 is an element of [1, 8, 2, 8]'