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  • python_day2

    python的数据类型:

    1.e记法(浮点型)

    >>> 1.5e10
    15000000000.0
    

     2.字符串类型转换为整形

    >>> a='90'
    >>> b=int(a)
    >>> b
    90
    >>> a='啦啦'
    >>> b=int(a)
    Traceback (most recent call last):
      File "<pyshell#8>", line 1, in <module>
        b=int(a)
    ValueError: invalid literal for int() with base 10: '啦啦'
    

     3.浮点型转换为整形

    >>> a=5.99
    >>> c=int(a)
    >>> c
    5
    

     4.type函数:

    >>> a='520'
    >>> type(a)
    <class 'str'>
    

     isinstance函数

    >>> a='lala'
    >>> isinstance(a,str)
    True
    >>> isinstance(a,int)
    False
    

     python之常用操作符:

    1.两种除法

    >>> 10/8
    1.25
    >>> 10//8
    1
    >>> 3.0//2
    1.0
    

     2.幂运算

    >>> 4**2
    16
    

     3.幂运算操作符优先级

    >>> -3**2
    -9
    >>> 2**(-2)
    0.25
    >>> 2**-2
    0.25
    
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  • 原文地址:https://www.cnblogs.com/wwq1204/p/10646693.html
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