Python-сообщество

 #
s = '{9}:{21}:http:{6}:{7}:{4}:{5}::10.05:текст:{11}@{12}:{13}:qqq{{101}}D{{ФЫА{{{}}'    
def f(s):
    tmp = ''
    out = ''
    for i in s:
        tmp += i
        if i == '{' :
            out += tmp
            tmp = '' 
        elif i == '}':
            t = tmp[:-1]
            if t.isdigit() : out += str(int(t) - 1) + '}'
            else : out += tmp
            tmp = ''
    out += tmp 
    return out
print 'in: ',s
print 'out:',f(s)

  
>>> int('0xff', 16)
255
>>> 
>>> int('0b1010', 2)
10
>>>

[guest@localhost bracenum]$ python -m doctest bracenum1.doct 
**********************************************************************
File "bracenum1.doct", line 41, in bracenum1.doct
Failed example:
    f('{00}')
Expected:
    '{00}'
Got:
    '{-1}'
**********************************************************************
File "bracenum1.doct", line 43, in bracenum1.doct
Failed example:
    f('{01}')
Expected:
    '{01}'
Got:
    '{0}'
**********************************************************************
1 items had failures:
   2 of  20 in bracenum1.doct
***Test Failed*** 2 failures.
[guest@localhost bracenum]$ 

 >>> int('\n90')
90
>>> int('\n\t90')
90
>>> int('90 ')
90
>>> int(' 90 ')
90
>>>