[英]Python: string to hex literal
I want to convert string that contains hex literal, for example: 我想转换包含十六进制文字的字符串,例如:
s = 'FFFF'
to hex value that contains literal string, like this: 包含文字字符串的十六进制值,如下所示:
h = 0xFFFF
So, I need a function to make this conversion. 因此,我需要一个函数来进行此转换。 For example:
例如:
h = func('FFFF')
What function I have to use? 我必须使用什么功能?
If you want the hex form to be the actual repr
esentation of your object, you would need to sub-class int
and implement __repr__
: 如果你想在十六进制形式是实际
repr
你的对象的esentation,你需要子类的int
和实施__repr__
:
class Hex(int):
def __new__(cls, arg, base=16):
if isinstance(arg, basestring):
return int.__new__(cls, arg, base)
return int.__new__(cls, arg)
def __repr__(self):
return '0x{:X}'.format(self)
Here I have also implemented __new__
to make 16
(rather than 10
) the default base
, so you can do things like: 在这里,我还实现了
__new__
以使16
(而不是10
)成为默认base
,因此您可以执行以下操作:
>>> Hex('FFFF') # base defaults to 16
0xFFFF
>>> Hex('42', 10) # still supports other bases
0x2A
>>> Hex(65535) # and numbers
0xFFFF
You will also have to emulate a numeric type to allow Hex
instances to be used in addition, subtraction, etc. (otherwise you'll just get a plain int
back). 您还必须模拟一个数值类型,以允许将
Hex
实例用于加法,减法等(否则,您将只获得一个普通的int
)。
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