[Tutor] ASCII characters

[Kent Johnson]

D. Hartley wrote:
> I have a question: what is the "opposite" of hex()? (i.e., like ord
> and chr).  If I have
> 
> '0x73', how can I get back to 115 or s?

I don't know a really clean way to do this because '0x73' is not a legal input value for int().

The simplest way is to use eval():
  >>> eval('0x73')
115

but eval() is a security hole so if you are not 100% sure of where your data is coming from then 
this is probably a better solution (it strips off the '0x' then tells int() to convert base 16):
  >>> int('0x73'[2:], 16)
115

To go from the string '115' to the integer 115 you can use int() directly:
  >>> int('115')
115

To get back to a string use chr():
  >>> chr(115)
's'

All of these functions are documented here:
http://docs.python.org/lib/built-in-funcs.html

Kent