Python

Create a string with Hex values

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Join Date: Oct 2009

Posts: 4

Reputation: iamai is an unknown quantity at this point

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iamai

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Newbie Poster

Create a string with Hex values

Oct 26th, 2009

Hello guys

I want to convert an integer to a hexadecimal string
examples
lets say i have an integer value 1 i want to convert it to 0001
integer value of 16 => 0010
245 =>00F5
and so on the string must have a length of 4 digits
my code is like this but i was wondering if there is an another way to do it

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 Python Syntax (Toggle Plain Text) 
new_address=hex(new_address)[2:].upper()
                if len(new_address)==3:
                    new_address="0"+new_address
                elif len(new_address)==2:
                    new_address="00"+new_address
                elif len(new_address)==1:
                    new_address="000"+new_address
                print new_address
new_address=hex(new_address)[2:].upper()
                if len(new_address)==3:
                    new_address="0"+new_address
                elif len(new_address)==2:
                    new_address="00"+new_address
                elif len(new_address)==1:
                    new_address="000"+new_address
                print new_address

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Join Date: Jul 2008

Posts: 1,067

Reputation: jlm699 is a jewel in the rough

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jlm699

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Knows where his Towel is

Oct 26th, 2009

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Originally Posted by iamai

I want to convert an integer to a hexadecimal string
examples
lets say i have an integer value 1 i want to convert it to 0001
integer value of 16 => 0010
245 =>00F5
and so on the string must have a length of 4 digits

It will be way simpler to use string formatting like so:

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 python Syntax (Toggle Plain Text) 
>>> print '%04X' % 16
0010
>>> print '%04X' % 245
00F5
>>> print '%04X' % 1024
0400
>>> print '%04X' % 4096
1000
>>> print '%04X' % 16
0010
>>> print '%04X' % 245
00F5
>>> print '%04X' % 1024
0400
>>> print '%04X' % 4096
1000

I'm sure you know already how to use the % symbol in strings to substitute values; however you may only know the basic usage. In this particular example we use a number of properties. First, the 0 denotes that we want our string to be padded with zeroes. Then we have a 4, which indicates we're reserving 4 spaces (if we simply had a 4 without the 0 there would be a blank space instead of a zero). And then finally we have the X. This indicates we're formatting the input (in this case an integer) to print out in hexadecimal. If we had used a lower-case X (ie, x) then the output would use lower-case hexadecimal digits.

HTH

Last edited by jlm699; Oct 26th, 2009 at 9:46 am. Reason: Added explanation

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