int()函数与2个args在Python中做什么

Question

在下面的代码中,int()对这两个参数做了什么:

if (i=='0X0F'):
    stat = int(log[i+1],16)

Answer 1

class int(object)
 |  int(x=0) -> int or long
 |  int(x, base=10) -> int or long
 |  
 |  Convert a number or string to an integer, or return 0 if no arguments
 |  are given.  If x is floating point, the conversion truncates towards zero.
 |  If x is outside the integer range, the function returns a long instead.
 |  
 |  If x is not a number or if base is given, then x must be a string or
 |  Unicode object 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.

Answer 2

第二个参数告诉int输入字符串的基数。来自帮助：

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.
 |  
 |  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.

因此，如果您这样做int(S, B)，它会显示“convert” S，这是一个数字的字符串表示形式B：

In [63]: int('10', 2)
Out[63]: 2

In [64]: int('10', 3)
Out[64]: 3

现在，如果B大于 10，则 python 假定下一个数字序列来自ABCD...。因此：

In [65]: int("A", 11)
Out[65]: 10