Integer to Hexadecimal Conversion in Python

Question

a = 1
print hex(a)

The above gives me the output: 0x1

How do I get the output as 0x01 instead?

Answer 1

Try:

print "0x%02x" % a

It's a little hairy, so let me break it down:

The first two characters, "0x" are literally printed. Python just spits them out verbatim.

The % tells python that a formatting sequence follows. The 0 tells the formatter that it should fill in any leading space with zeroes and the 2 tells it to use at least two columns to do it. The x is the end of the formatting sequence and indicates the type - hexidecimal.

If you wanted to print "0x00001", you'd use "0x%05x", etc.