Python: Is there a way to split a string of numbers into every 3rd number?

Fo开发者_开发知识库r example, if I have a string a=123456789876567543 could i have a list like...

123 456 789 876 567 543

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>>> a="123456789"
>>> [int(a[i:i+3]) for i in range(0, len(a), 3)]
[123, 456, 789]

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Recipe from the itertools docs (you can define a fillvalue when the length is not a multiple of 3):

from itertools import izip_longest

def grouper(n, iterable, fillvalue=None):
    args = [iter(iterable)] * n
    return izip_longest(fillvalue=fillvalue, *args)

s = '123456789876567543'

print [''.join(l) for l in grouper(3, s, '')]


>>> ['123', '456', '789', '876', '567', '543']

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>>> import re
>>> a = '123456789876567543'
>>> l = re.findall('.{1,3}', a)
>>> l
['123', '456', '789', '876', '567', '543']
>>> 

---

s = str(123456789876567543)
l = []
for i in xrange(0, len(s), 3):
    l.append(int(s[i:i+3]))
print l

---

If you want right alignment:

a='123456789876567543'
format(int(a),',').split(',')
['123', '456', '789', '876', '567', '543']
a='12345'
format(int(a),',').split(',')
['12', '345']