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#!/usr/bin/env python

import string
from time import time
from itertools import chain
from random import seed, choice, shuffle


def mkpasswd(length=8, digits=2, upper=2, lower=2):
    """Create a random password

    Create a random password with the specified length and no. of
    digit, upper and lower case letters.

    :param length: Maximum no. of characters in the password
    :type length: int

    :param digits: Minimum no. of digits in the password
    :type digits: int

    :param upper: Minimum no. of upper case letters in the password
    :type upper: int

    :param lower: Minimum no. of lower case letters in the password
    :type lower: int

    :returns: A random password with the above constaints
    :rtype: str
    """

    seed(time())

    lowercase = string.lowercase.translate(None, "o")
    uppercase = string.uppercase.translate(None, "O")
    letters = "{0:s}{1:s}".format(lowercase, uppercase)

    password = list(
        chain(
            (choice(uppercase) for _ in range(upper)),
            (choice(lowercase) for _ in range(lower)),
            (choice(string.digits) for _ in range(digits)),
            (choice(letters) for _ in range((length - digits - upper - lower)))
        )
    )

    return "".join(sample(password, len(password)))


print mkpasswd()
print mkpasswd(12)
print mkpasswd(digits=3)
print mkpasswd(12, upper=4)

Diff to Previous Revision

--- revision 1 2013-02-21 11:30:43
+++ revision 2 2013-02-23 17:00:52
@@ -30,20 +30,20 @@
 
     seed(time())
 
-    letters = string.letters.strip("oO")
+    lowercase = string.lowercase.translate(None, "o")
+    uppercase = string.uppercase.translate(None, "O")
+    letters = "{0:s}{1:s}".format(lowercase, uppercase)
 
     password = list(
         chain(
+            (choice(uppercase) for _ in range(upper)),
+            (choice(lowercase) for _ in range(lower)),
             (choice(string.digits) for _ in range(digits)),
-            (choice(string.uppercase) for _ in range(upper)),
-            (choice(string.lowercase) for _ in range(lower)),
             (choice(letters) for _ in range((length - digits - upper - lower)))
         )
     )
 
-    shuffle(password)
-
-    return "".join(password)
+    return "".join(sample(password, len(password)))
 
 
 print mkpasswd()

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