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

ivan_pozdeev
– ivan_pozdeev

2015-02-22 07:29:04 +00:00
Commented Feb 22, 2015 at 7:29 — ivan_pozdeev
– ivan_pozdeev, Commented Feb 22, 2015 at 7:29

Kasravnd · Accepted Answer · 2015-02-25 14:05:43Z

14

You can use format :

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

edited Feb 25, 2015 at 14:05

Kasravnd

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answered Feb 21, 2015 at 20:25

Bhargav Rao

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1 Comment

SethMMorton Over a year ago

This should be preferred over the % methods (aka old-style formatting).

Urban48 · Accepted Answer · 2015-02-21 20:38:47Z

3

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

edited Feb 21, 2015 at 20:38

answered Feb 21, 2015 at 20:30

Urban48

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Comments

Sniggerfardimungus · Accepted Answer · 2015-02-21 20:25:08Z

2

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.

answered Feb 21, 2015 at 20:25

Sniggerfardimungus

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Comments

Kasravnd · Accepted Answer · 2015-02-25 14:06:45Z

2

print "0x%02x"%a

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

edited Feb 25, 2015 at 14:06

Kasravnd

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answered Feb 21, 2015 at 20:24

khelwood

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Comments

runDOSrun · Accepted Answer · 2015-02-21 20:26:08Z

1

You can use format:

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

answered Feb 21, 2015 at 20:26

runDOSrun

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Comments

Intrastellar Explorer · Accepted Answer · 2020-02-06 03:13:58Z

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 6, 2020 at 3:13

answered Feb 6, 2020 at 3:04

Intrastellar Explorer

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