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    一对引号字符串：

    1. name1 = 'Tom'
    2. name2 = "Rose"

    三引号字符串：

    1. name3 = ''' Tom '''
    2. name4 = """ Rose """
    3. a = ''' i am Tom,
    4.     nice to meet you! '''
    5. b = """ i am Rose,
    6.     nice to meet you! """

    注意：三引号形式的字符串⽀持换⾏。

    思考：如果创建⼀个字符串 I’m Tom ?

    1. c = "I'm Tom"
    2. d = 'I\'m Tom'