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 LinuxQuestions.org In Python, printing leading zero for hex numbers 0 through f
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 04-15-2009, 07:17 PM #1 donpar LQ Newbie   Registered: Feb 2006 Location: Sunnyvale, CA Distribution: RH Enterprise 5 and 6, RHEV 2.2 Posts: 2 Rep: In Python, printing leading zero for hex numbers 0 through f Hello, This is probably a simple question for an experienced Python person: This is a little python program that gets 3 random hex numbers and prints them out: import random hn1 = (hex(random.randint(0,63))[2:]) hn2 = (hex(random.randint(0,255))[2:]) hn3 = (hex(random.randint(0,255))[2:]) print (hn1,":",hn2,":",hn3,sep="") Example Result: 37:bc:31 All is fine & dandy except when the hex number is from 0 through f. In that case the result may be 7b:5:5c I'd actually like it to be 7b:05:5c Is there a simple way of formatting this? Many thanks, Don P
 04-15-2009, 08:09 PM #2 rriggs Member   Registered: Mar 2009 Location: Colorado, US Distribution: Fedora 13, Fedora 14, RHEL6 Beta Posts: 46 Rep: Don't convert the numbers to hex strings with hex(). Use print formatting to format the numbers. >>> print '%02X:%02X:%02X' % (12, 21, 129) 0C:15:81 Or >>> hx='%02X:%02X:%02X' % (12, 21,129) >>> print hx 0C:15:81 Regards

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