On 26 Jun 2012, at 15:53, Sithembewena Lloyd Dube wrote:
> Would anyone have tips on how to generate random 4-digit alphanumeric codes
> in python? Also, how does one calculate the number of possible combinations?
For upper case, lower case and digits we have,
26 + 26 + 10 = 62
...possibilities for each position. If you have four positions you have,
62 * 62 * 62 * 62 = 14776336
... possible combinations.
You can create a random number in this range by,
import Random from random
def build_population(spans):
for span in spans:
for x in range(ord(span[0]), ord(span[1]) + 1):
yield chr(x)
population = list(build_population( (('A','Z'), ('a', 'z'), ('0', '9'))
))
r = Random()
r.sample(population, 4)
['C', 'l', 'q', 'y']
You may need to look into getting some entropy into the random number
generator...
Cheers
aid
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