On 03/04/12 15:54, Khalid Al-Ghamdi wrote:

     dom="".join(choice(lc) for j in range (dlen))

how does the interpreter know what "j" is supposed to refer to when it
was not mentioned prior?

In Python variables are defined by using them.

In the code below you have i used in a for loop, even though not mentioned before. j is similarly being used in the generator expression for loop:

choice(lc) for j in range (dlen)

unwraps to:

dummy = []
for j in range(dlen):
   dummy.append(choice(lc))

Which effectively creates a list of dlen choice items.


from random import randrange, choice
from string import ascii_lowercase as lc
from sys import maxsize
from time import ctime

tlds = ('com', 'edu', 'net', 'org', 'gov')

for i in range(randrange(5,11)):
     dtint=randrange(maxsize)    #pick a random number to use to

HTH
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/

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