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?

possible duplicate of [Python string formatting](http://stackoverflow.com/questions/543399/python-string-formatting) — ivan_pozdeev, Feb 22 '15 at 07:29

score 13 · Accepted Answer · edited Feb 25 '15 at 14:05

13

You can use format :

>>> a = 1
>>> '{0:02x}'.format(a)
'01'
>>> '0x{0:02x}'.format(a)
'0x01'

edited Feb 25 '15 at 14:05

Mazdak

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answered Feb 21 '15 at 20:25

Bhargav Rao

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1

This should be preferred over the `%` methods (aka old-style formatting). – SethMMorton Feb 21 '15 at 20:28

Urban48 · Answer 2 · 2015-02-21T20:38:47.167

3

>>> format(1, '#04x') 
'0x01'

edited Feb 21 '15 at 20:38

answered Feb 21 '15 at 20:30

Urban48

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score 2 · Answer 3 · edited Feb 25 '15 at 14:06

2

print "0x%02x"%a

x as a format means "print as hex".
02 means "pad with zeroes to two characters".

edited Feb 25 '15 at 14:06

Mazdak

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answered Feb 21 '15 at 20:24

khelwood

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score 2 · Answer 4 · answered Feb 21 '15 at 20:25

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.

score 1 · Answer 5 · answered Feb 21 '15 at 20:26

1

You can use format:

>>> "0x"+format(1, "02x")
'0x01'

answered Feb 21 '15 at 20:26

runDOSrun

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Intrastellar Explorer · Answer 6 · 2020-02-06T03:13:58.963

0

Here is f-string variant for Python 3.6+:

a = 1
print(f"{a:0>2x}")

Explanation of string formatting:

:: format specifier
0: fill (with 0)
>: right-align field
2: width
x: hex type

Source: 6.1.3.1 Format Specification Mini-Language

edited Feb 06 '20 at 03:13

answered Feb 06 '20 at 03:04

Intrastellar Explorer

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Integer to Hexadecimal Conversion in Python

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