[Tutor] Decoding

Kent Johnson kent37 at tds.net
Mon Aug 13 04:08:36 CEST 2007

bhaaluu wrote:
> Greetings,
>>From what I can tell of this "decoding" function, it uses
> the chr() function to return the ascii character:
>>>> print chr(eval('65'))
> A

There is no need to use eval() here. Since the expected values are 
integers, just use int():
In [6]: chr(int('65'))
Out[6]: 'A'

This gives a clearer error message when the input is not as expected:
In [7]: chr(int('How'))
Traceback (most recent call last):
   File "<ipython console>", line 1, in <module>
<type 'exceptions.ValueError'>: invalid literal for int() with base 10: 

In general it's a good idea to avoid using eval() especially with user 
input, it is a gaping security hole.


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