def cut(string, n):
	parts = len(string)//n
	arr = []
	for count in xrange(parts):
		arr.append(s[n*count:n*count + n])
	arr.append(s[n*(count+1):])
	return arr

# -*- coding: utf-8 -*-

import timeit

def div_str(string, part_lenght):
    for n in xrange(len(string)//part_lenght):
        yield string[n * part_lenght : (n+1) * part_lenght]
    if string[(n+1) * part_lenght : (n+2) * part_lenght]:
        yield string[(n+1) * part_lenght : (n+2) * part_lenght]

print list(div_str("0123456789", 4))
print list(div_str("0123456789", 2))
print timeit.Timer('for _ in div_str("0123456789" * 10000, 30): pass',
        'from __main__ import div_str').timeit(1000)
print timeit.Timer('list(div_str("0123456789" * 10000, 30))',
        'from __main__ import div_str').timeit(1000)

print '-=-' * 10

def div_str(string, part_lenght):
    from cStringIO import StringIO
    sio = StringIO(string)
    while True:
        d = sio.read(part_lenght)
        if not d:
            return
        yield d

print list(div_str("0123456789", 4))
print list(div_str("0123456789", 2))
print timeit.Timer('for _ in div_str("0123456789" * 10000, 30): pass',
        'from __main__ import div_str').timeit(1000)
print timeit.Timer('list(div_str("0123456789" * 10000, 30))',
        'from __main__ import div_str').timeit(1000)

print '-=-' * 10

from textwrap import wrap
print wrap("0123456789", 4)
print wrap("0123456789", 2)
print timeit.Timer('for _ in wrap("0123456789" * 10000, 30): pass',
        'from textwrap import wrap').timeit(1000)

s = 'Testosterone is a steroid hormone from the androgen group...'
step = 4
print [s[i:i+step] for i in xrange(0, len(s), step)]

s = 'Testosterone is a steroid hormone from the androgen group...'
step = 4
it = (s[i:i+step] for i in xrange(0, len(s), step)])
print list(it)

# -*- coding: utf-8 -*-

import timeit

string = "0123456789" * 10000
step = 30
print timeit.Timer('[string[i:i+step] for i in xrange(0, len(string), step)]',
        'from __main__ import string, step').timeit(1000)
print timeit.Timer('for _ in (string[i:i+step] for i in xrange(0, len(string), step)): pass',
        'from __main__ import string, step').timeit(1000)