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  • python int str

    1. int 类型转换

    a = "123"
    b = int(a)
    b = b+10
    print(type(a),a)
    print(type(b),b)
    

    2. int(num,base=2), base不写的时候默认为10

    a = "0011"
    b = int(a,base=2)
    print(b)
    

      答案为 3.

    3. -.bit_length() 当前数字为2进制时,至少要用多少位来表示

    a = 8
    b = a.bit_length()
    print(b)
    

     answer:4

    4. str 居住 center()

    a = "kkkk"
    b = a.center(20,"&")
    print(b)
    #"&"中只能填一个
    
    &&&&&&&&kkkk&&&&&&&&
    

    5. str 之count()计数

    count(self, sub, start=None, end=None)
    a = "kkkkrrrrrrrrrxxxxxxxxx"
    b = a.count('r',5,14)
    print(b)
    
    8
    

    6. find(self, sub, start=0, end=_sys.maxsize) 比index()好用

    a = "djalskfjs;kd k"
    b = a.find("ja",0,20)
    print(b)
    
    1

    7. format(self, *args, **kwargs ) 两种方式效果一样

    a = 'jkldak{ff},ioeu{gg}'
    b = a.format(ff='JOAN',gg='HUMAN')
    print(b)
    
    
    
    a = 'jkldak{0},ioeu{1}'
    b = a.format('JOAN','HUMAN')
    print(b)
    
    
    jkldakJOAN,ioeuHUMAN
    

    8. format_map(self, mapping)

    format_map(self, mapping): # real signature unknown; restored from __doc__

    9. def isalnum(self, *args, **kwargs): # real signature unknown

      Return True if the string is an alpha-numeric string, False otherwise.
    
    
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  • 原文地址:https://www.cnblogs.com/jijianhu/p/10301509.html
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