Sandhya Prabhakaran <sandhyaprabhaka...@gmail.com> wrote:
> I have a string as str='123ACTGAAC'.
You shouldn't use 'str' as a label like that, it prevents you from
using the str() function in the same body of code.
> How do I blank out the initial numeric part so as to get just the
> alphabetic part. The string is always in the same format.
>>> sample = '123ACTGAAC'
>>> numer = ''.join(s for s in sample if s.isdigit())
>>> alpha = ''.join(s for s in sample if s.isalpha())
>>> numer, alpha
('123', 'ACTGAAC')
If by 'always in the same format' you mean the positions of the
numbers & alphas,
you could slightly abuse the struct module:
>>> import struct
>>> sample = '123ACTGAAC'
>>> format = '3s7s' # a string of 3 + a string of 7
>>> struct.unpack(format, sample)
('123', 'ACTGAAC')
But seriously, you should use slicing:
>>> sample = '123ACTGAAC'
>>> sample[0:3], sample[3:]
('123', 'CTGAAC')
You can also label the slices, which can be handy for self-documenting
your code:
>>> num = slice(3)
>>> alp = slice(4,10)
>>> sample[num], sample[alp]
('123', 'CTGAAC')
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