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Active4 months ago
I'm toying around with writing creating a serial code generator/validator, but I can't seem to get how to do a proper check.
Here's my generator code:
I'd like to make a universal check so that my validation code will accept any key generated by this.
My intuition was to create checks like this:
I'm well aware that the second type of check won't work at all, but it's a place holder because I've got no idea how to check that.
But I thought the method for checking numbers would work, but it doesn't either.
user679400user679400
2 Answers
The expression `range(1, 5)' creates a list of numbers from 1 to 4. So in your first test, you're asking whether the first character in your serial number is equal to that list:
Probably not...
What you probably want to know is whether a digit is in the range (i.e. from 1 to 5, I assume, not 1 to 4).
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Your other hurdle is that the first character of the serial is a string, not an integer, so you would want to take the
int()
of the first character. But that will raise an exception if it's not a digit. So you must first test to make sure it's a digit:
Don't worry, if it's not a digit, Python won't even try to evaluate the part after
and
. This is called short-circuiting.
However, I would not recommend doing it this way. Instead, simply check to make sure it is at least '1' and no more than '5', like this:
You can do the same thing with each of your tests, varying only what you're checking.
Also, you don't need to convert the serial number to a list.
serial_check
is a string and accessing strings by index is perfectly acceptable.
And finally, there's this pattern going on in your code:
First, because the conditions you are testing are logical opposites, you don't need
elif thing != other
-- you can just say else
, which means 'whatever wasn't matched by any if
condition.'
But if you're just going to
pass
when the condition is met, why not just test the opposite condition to begin with? You clearly know how to write it 'cause you were putting it in the elif
. Put it right in the if
instead!
Yes, each of your
kindallkindall
if
statements can easily be cut in half. In the example I gave you for checking the character range, probably the easiest way to do it is using not
:
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Regarding your python, I'm guessing that when your wrote this:
You probably meant this:
And when you wrote this:
You probably meant this:
There are various other problems with your code, but I'm sure you'll improve it as you learn python.
At a higher level, you seem to be trying to build something like a software activation code generator/validator. You should know that just generating a string of pseudo-random characters and later checking that each is in range is an extremely weak form of validation. If you want to prevent forgeries, I would suggest learning about HMAC (if you're validating on a secure server) or public key cryptography (if you're validating on a user's computer) and incorporating that into your design. There are libraries available for python that can handle either approach.
ʇsәɹoɈʇsәɹoɈ
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Not the answer you're looking for? Browse other questions tagged python or ask your own question.
Active1 year, 7 months ago
I want to have a random serial created on my website everytime someone visits.
The format of the serial should be XXXXX-XXXXX-XXXXX-XXXXX.
X represents a random number or capital letter.
Unfortunately I have no idea how to do this. Could anybody please help me out?
Unfortunately I have no idea how to do this. Could anybody please help me out?
So for example the random serial output could be: 3WT4A-NB34O-JU87P-B3UHS
Thanks a lot!
kuba
Thanks a lot!
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Kid DiamondKid Diamond
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7 Answers
There are most certainly better ways of doing it, but this is the first that jumps to mind:
05/26/13 Edit: It's advised to keep the Count function outside of the loop. The reason for this is that you don't want to expend the extra clock cycles running this function through each iteration when you can simply run it once.
maiorano84maiorano84
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Another approach is to calculate the four segments as random numbers in base 36.
salathesalathe
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The most straightforward solution would be something like this.
Sample output:
blafratblafrat
There's a bunch of ways to approach this. One simple one is:
There are better ways to generate random strings then this but this would give you the basic functionality you're looking for.
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John Conde
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Moyed Ansari
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Moyed Ansari
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If you want to use this serial just because of uniqueness - you could also try to use UUID v4, as described in one of answers here: PHP function to generate v4 UUID
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LaimoncijusLaimoncijus
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There a lot of such answers at SO: https://stackoverflow.com/a/4356295/1091195
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You can use the random string generator mentioned there, either you use it once to get a 20 letter string then insert dashes, or you can call it 4 times for 5 letter and concat the results.
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kubakuba
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