def string_to_number(s, alphabet):
"""
Given a string ``s``, convert it to an integer composed of the given
``alphabet`` mapping, where the position of each element in ``alphabet`` is
its radix value.
Examples::
>>> string_to_number('101111000110000101001110', '01')
12345678
>>> string_to_number('babbbbaaabbaaaababaabbba', 'ab')
12345678
>>> string_to_number('ZXP0', string.ascii_letters + string.digits)
12345678
"""
base = len(alphabet)
inverse_alphabet = dict(zip(alphabet, xrange(0, base)))
n = 0
exp = 0
for i in reversed(s):
n += inverse_alphabet[i] * (base**exp)
exp += 1
return n
def string_to_number(s, alphabet):
"""
Given a string ``s``, convert it to an integer composed of the given
``alphabet`` mapping, where the position of each element in ``alphabet`` is
its radix value.
Examples::
>>> string_to_number('101111000110000101001110', '01')
12345678
>>> string_to_number('babbbbaaabbaaaababaabbba', 'ab')
12345678
>>> string_to_number('ZXP0', string.ascii_letters + string.digits)
12345678
"""
base = len(alphabet)
inverse_alphabet = dict(zip(alphabet, xrange(0, base)))
n = 0
exp = 0
for i in reversed(s):
n += inverse_alphabet[i] * (base ** exp)
exp += 1
return n
def random_string(length=6, alphabet=string.ascii_letters + string.digits):
"""
Return a random string of given length and alphabet.
Default alphabet is url-friendly (base62).
"""
return ''.join([random.choice(alphabet) for i in xrange(length)])
def random_string(length=6, alphabet=string.ascii_letters+string.digits):
"""
Return a random string of given length and alphabet.
Default alphabet is url-friendly (base62).
"""
return ''.join([random.choice(alphabet) for i in xrange(length)])