1. 以首字母大写的方式显示每个单词：

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    name = "ada lovelace"
    print(name.title())    # Ada Lovelace

  1. 删除字符串开头和末尾的空白：

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    favorite_language1 = ' Python'
    print(favorite_language1.lstrip())   # 'Python'
    print(favorite_language1)    # ' Python'
     
    favorite_language2 = 'Python '
    print(favorite_language2.rstrip())   # 'Python'
    print(favorite_language2)   # 'Python '

  2. Python 使用两个乘号表示乘方运算：

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    print(3 ** 2)   # 27
    print(10 ** 6)   # 1000000

  3. Python 不能精确表示 0.3：

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    print(0.2 + 0.1)   # 0.30000000000000004
    print(3 * 0.1)    # 0.30000000000000004

  4. 使用函数 str() 避免类型错误：

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    # wrong
    age = 23
    message = "Happy " + age + "rd Birthday!"
    print(message)
     
    # right
    age = 23
    message = "Happy " + str(age) + "rd Birthday!"
    print(message)

  5. python 2 与 python 3 之间整数除法的差别：

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    # python 2
    print(3 / 2)    # 1
    print(3.0 / 2)  # 1.5
    print(3 / 2.0)   # 1.5
    print(3.0 / 2.0)  # 1.5
     
    # python 3
    print(3 / 2)    # 1.5
    print(3.0 / 2)  # 1.5
    print(3 / 2.0)   # 1.5
    print(3.0 / 2.0)  # 1.5

    ​