int文档

文档

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class int(object):     """     int(x=0) -> integer     int(x, base=10) -> integer     ----------------------------------------------------------------------------------     Convert a number or string to an integer, or return 0 if no arguments     are given.  If x is a number, return x.__int__().  For floating point     numbers, this truncates towards zero.     将一个数字或者字符串（str.isNum==True），如果没有给参数，默认为0（如print(int())结果为0）     如果参数x是一个数字，则返回x.__int__()的结果，如果是一个浮点数，则会只取整数，     (如print(int(2.5))的结果为2)     ----------------------------------------------------------------------------------     If x is not a number or if base is given, then x must be a string,     bytes, or bytearray instance representing an integer literal in the     given base.  The literal can be preceded by '+' or '-' and be surrounded     by whitespace.  The base defaults to 10.  Valid bases are 0 and 2-36.     Base 0 means to interpret the base from the string as an integer literal.     >>> int('0b100', base=0)     4     base参数为进制，默认为10进制     """       def bit_length(self):  # real signature unknown; restored from __doc__         """         int.bit_length() -> int         ----------------------------------------------------------------------------------         返回一个int数转换为二进制后至少要用多少位来表示，返回值为int类型         Number of bits necessary to represent self in binary.         数字必须转换为二进制后再计算         ----------------------------------------------------------------------------------         >>> bin(37)         '0b100101'         >>> (37).bit_length()         6         如：37的二进制为'0b100101'（6位），那么37的bit_length()结果为6         ----------------------------------------------------------------------------------         """         return 0

　　

示例

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print(int())            # 结果为0 print(int(2.5))         # 结果为   n = 250 n_bytes = bin(n) print(n_bytes)          # 结果为0b11111010 print(n.bit_length())   # 结果为8   print(int('0b1010',base=0)) # 结果为10