Re: Restricting the alphabet of a string
- From: 7stud <bbxx789_05ss@xxxxxxxxx>
- Date: 30 Apr 2007 07:00:29 -0700
On Apr 30, 5:53 am, "Nathan Harmston" <ratchetg...@xxxxxxxxxxxxxx>
wrote:
Hi,
I ve being thinking about playing around with bit strings but use in
some encoding problems I m considering and was trying to decide how to
implement a bit string class. Is there a library out there for doing
basic things with bit strings already is my first question?
I know that I can extend string to bit string, but is there anyway I
can force the alphabet to be restricted to 1's and 0's (or even 1, 0
and -1, as an extension to from trinary strings).
class Binary_String(String):
pass
Many Thanks
Nathan
You could do something like this:
class Binary_String(str):
def __init__(self, val):
i = 0
for char in val:
if char not in "-101":
raise ValueError("illegal character at index " +
str(i) + "\nOnly -1,0,1 allowed.")
i+=1
self.val = val
b = Binary_String("1a0101")
--output:--
Traceback (most recent call last):
File "test1.py", line 13, in ?
b = Binary_String("1a100")
File "test1.py", line 6, in __init__
raise ValueError("illegal character at index " + str(i)
ValueError: illegal character at index 1
Only -1,0,1 allowed.
.
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