def run(string, num):
"""
>>> run('1', 5)
6
"""
res = p.nth(num, p.iterate(look_and_say, string))
return p.ilen(res)
def get_passwords(string):
"""
>>> next(get_passwords('abcdefgh'))
'abcdffaa'
>> next(get_passwords('ghijklmn'))
'ghjaabcc'
"""
seq = p.drop(1, p.iterate(inc_string, string))
passwords = filter(meets_reqs, seq)
return passwords
def root(a):
f = lambda x: 0.5 * (a / x + x)
return last(take(10, iterate(f, 1.0)))
def fixed_point(iterator, eps, itmax, guess):
stream = iterate(iterator, guess)
return last(until_converge(stream, eps, itmax))
