Use the format() function with a '02x' format.
>>> format(255, '02x')
'ff'
>>> format(2, '02x')
'02'
The 02 part tells format() to use at least 2 digits and to use zeros to pad it to length, x means lower-case hexadecimal.
The Format Specification Mini Language also gives you X for uppercase hex output, and you can prefix the field width with # to include a 0x or 0X prefix (depending on wether you used x or X as the formatter). Just take into account that you need to adjust the field width to allow for those extra 2 characters:
>>> format(255, '02X')
'FF'
>>> format(255, '#04x')
'0xff'
>>> format(255, '#04X')
'0XFF'
Top answer 1 of 3
163
Use the format() function with a '02x' format.
>>> format(255, '02x')
'ff'
>>> format(2, '02x')
'02'
The 02 part tells format() to use at least 2 digits and to use zeros to pad it to length, x means lower-case hexadecimal.
The Format Specification Mini Language also gives you X for uppercase hex output, and you can prefix the field width with # to include a 0x or 0X prefix (depending on wether you used x or X as the formatter). Just take into account that you need to adjust the field width to allow for those extra 2 characters:
>>> format(255, '02X')
'FF'
>>> format(255, '#04x')
'0xff'
>>> format(255, '#04X')
'0XFF'
2 of 3
26
I think this is what you want:
>>> def twoDigitHex( number ):
... return '%02x' % number
...
>>> twoDigitHex( 2 )
'02'
>>> twoDigitHex( 255 )
'ff'
Reddit
reddit.com › r/learnpython › what does the '::' do and "'%02x%02x%02x' %"?
r/learnpython on Reddit: What does the '::' do and "'xxx' %"?
August 18, 2019 -
import colorsys
import time
def drawRainbow():
with open("/sys/devices/platform/system76/leds/system76::kbd_backlight/color_left", "r+") as f:
for i in range(1000):
r, g, b = colorsys.hsv_to_rgb(i/100, 1.0, 1.0)
hexcolor = '%02x%02x%02x' % (int(r*255), int(g*255), int(b*255))
f.write(hexcolor)
f.flush()
time.sleep(2)
while True:
drawRainbow()I'm trying to read through the code, but I'm not quite sure what to make of those two parts. Could someone explain? The '%' I know is a modulus operator, but I don't quite understand how to apply that to the particular line of code.
Top answer 1 of 3
6
The :: is just part of the file path, it's not special. %02x%02x%02x encodes the color triple as an RGB string like "aaffee", where every 2 characters is one color channel in hexadecimal, using string formatting.
2 of 3
3
The '::' is simply part of the directory name. $ touch a::b $ ls -1 a::b The other is to compile a string with hexadecimal representations. int(r*255) is a number and the program wants to write a string with the hex equivalent. '%02x' % int(r*255) is a way to do that: %x means "hex", 02 means field width of two, padded on the left by zero(s). Example, with width of five. >>> '%05x' % 23 '00017' And, here's using 'd' instead of 'x', for a decimal number (matching the input integer). >>> '%05x %06d' % (23, 77) '00017 000077'
The Teclado Blog
blog.teclado.com › python-formatting-integers-in-different-bases
Formatting Integers in Different Bases in Python
June 25, 2026 - The syntax for this is :02x, which means represent the number as hexadecimal (x), display the number with two figures (2), and pad the number with zeroes if we have fewer than two figures (0).
Reddit
reddit.com › r/learnpython › map('{:02x}'.format, bytes_addr)
r/learnpython on Reddit: map('{:02x}'.format, bytes_addr)
May 1, 2018 -
Hello all,
I am having trouble understanding what this statement does. This statement is supposed to help me format mac addresses as they are received, but I don't see why we would need to format mac addresses to two decimal places when mac addresses don't have decimals. Am I missing something?
Finxter
blog.finxter.com › home › learn python blog › python int to hex | string formatting
Python Int to Hex | String Formatting - Be on the Right Side of Change
November 16, 2022 - You can use the format specifer 02X to convert an integer to a fixed-width hex string with 2 positions, and filling the remaining positions with '0' symbols from the left.
Python
docs.python.org › 3 › library › string.html
string — Common string operations
>>> for align, text in zip('<^>', ['left', 'center', 'right']): ... '{0:{fill}{align}16}'.format(text, fill=align, align=align) ... 'left<<<<<<<<<<<<' '^^^^^center^^^^^' '>>>>>>>>>>>right' >>> >>> octets = [192, 168, 0, 1] >>> '{:02X}{:02X}{:02X}{:02X}'.format(*octets) 'C0A80001' >>> int(_, 16) 3232235521 >>> >>> width = 5 >>> for num in range(5,12): ...
Alibaba Cloud
topic.alibabacloud.com › zqpop › 02x-python_10119.html
The Latest information about 02x python | Alibaba Cloud
This paper describes the implementation of DES encryption and decryption method in Python. Share to everyone for your reference.
GeeksforGeeks
geeksforgeeks.org › python › python-convert-bytearray-to-hexadecimal-string
Convert Bytearray to Hexadecimal String - Python - GeeksforGeeks
July 12, 2025 - format(byte, '02x') ensures each byte is converted to a two-digit hexadecimal string (padded with zero if needed).
TestMu AI Community
community.testmuai.com › ask a question
What is 02x in Python? - TestMu AI Community
July 14, 2022 - What is 02x in Python
Faq Inc
faq.splendida.live › home › what is 02x in python?
What is 02x in python? - Faq
The 02x tells Python we want the number represented as a 2 digit hexadecimal number, where any missing digits are padded with zeroes.
Python
docs.python.org › 3.1 › library › string.html
7.1. string — Common string operations — Python v3.1.5 documentation
August 1, 2015 - >>> for align, text in zip('<^>', ['left', 'center', 'right']): ... '{0:{fill}{align}16}'.format(text, fill=align, align=align) ... 'left<<<<<<<<<<<<' '^^^^^center^^^^^' '>>>>>>>>>>>right' >>> >>> octets = [192, 168, 0, 1] >>> '{:02X}{:02X}{:02X}{:02X}'.format(*octets) 'C0A80001' >>> int(_, 16) 3232235521 >>> >>> width = 5 >>> for num in range(5,12): ...
LabEx
labex.io › tutorials › python-how-to-ensure-precise-hex-formatting-436768
How to ensure precise hex formatting | LabEx
By mastering these formatting techniques, you'll gain precise control over hexadecimal representation in Python, enhancing your data manipulation skills across various programming scenarios. class ColorConverter: @staticmethod def rgb_to_hex(r, g, b): return f'#{r:02x}{g:02x}{b:02x}' @staticmethod def hex_to_rgb(hex_color): hex_color = hex_color.lstrip('#') return tuple(int(hex_color[i:i+2], 16) for i in (0, 2, 4)) ## Usage example red = ColorConverter.rgb_to_hex(255, 0, 0) print(red) ## #ff0000 ·
Medium
medium.com › @bhanotkaran22 › hey-nitin-97e301ee2ead
Hey Nitin,. Let’s consider the case {0:02x}. | by Karan Bhanot | Medium
June 9, 2019 - Hey Nitin, Let’s consider the case {0:02x}. Whenever we want to specify a format of our string, we include it in curly braces {}. Taking a look at the example here, the number before : defines the …
Picuino
picuino.com › en › python-textos-formateo.html
24. Formatting text strings - Python tutorial - Picuino
June 13, 2026 - Remember that hexadecimal values must be in capital letters and must have two digits. The way to convert a variable to hexadecimal that always has two digits is to add the following format to the variable: f'{variable:02X}'.
Pythoncomplexity
pythoncomplexity.com › builtins › hex
Hex - Python Big-O: Time & Space Complexity
# O(log n) - RGB values to hex color def rgb_to_hex(r, g, b): # O(log(256)) = O(8) per channel return f"#{hex(r)[2:]:>02}{hex(g)[2:]:>02}{hex(b)[2:]:>02}" color = rgb_to_hex(255, 128, 64) # '#ff8040' # Converting from integers red = 255 green = 128 blue = 64 color_hex = f"#{red:02x}{green:02x}{blue:02x}" # Cleaner with format strings
Raspberry Pi Forums
forums.raspberrypi.com › board index › using the raspberry pi › beginners
Changing Hex String - Raspberry Pi Forums
You don't even have to fuss with hex values: playcmd(1,180) would return the same, as would playcmd(m, s) if you'd set m=1 and s=180 (= 0xb4) beforehand. The code above uses the older Python % formatting operator, which works just like other languages' sprintf() function.
w3resource
w3resource.com › python-exercises › python-basic-exercise-141.php
Python: Convert decimal to hexadecimal - w3resource
May 17, 2025 - # It ensures that there are leading ... of 'x' with leading zeros. # The 'format' function is used with the format specifier '02x' to format 'x' as a 2-character lowercase hexadecimal string....
Top answer 1 of 7
69
You can use string formatting for this purpose:
>>> "0x{:02x}".format(13)
'0x0d'
>>> "0x{:02x}".format(131)
'0x83'
Edit: Your code suggests that you are trying to convert a string to a hexstring representation. There is a much easier way to do this (Python2.x):
>>> "abcd".encode("hex")
'61626364'
An alternative (that also works in Python 3.x) is the function binascii.hexlify().
2 of 7
22
You can use the format function:
>>> format(10, '02x')
'0a'
You won't need to remove the 0x part with that (like you did with the [2:])
Stack Overflow
stackoverflow.com › questions › 54283039 › 02x02x02x02x-formatoctets-c0a80001
python - '{:02X}{:02X}{:02X}{:02X}'.format(*octets) 'C0A80001' - Stack Overflow
January 21, 2019 - I read the string — Common string operations — Python 3.7.2 documentation · The below example is easy to follow: >>> "int: {0:d}; hex: {0:x}; oct: {0:o}; bin: {0:b}".format(42) 'int: 42; hex: 2a; oct: 52; bin: 101010' As to the instance · >>> octets = [192, 168, 0, 1] >>> '{:02X}{:02X}{:02X}{:02X}'.format(*octets) 'C0A80001 ·
Finxter
blog.finxter.com › home › learn python blog › 5 best ways to convert python rgb tuples to hex
5 Best Ways to Convert Python RGB Tuples to Hex - Be on the Right Side of Change
February 22, 2024 - An easy way to convert an RGB tuple to a hexadecimal string in Python is by using string format specification. This method takes advantage of the format mini-language built into Python where '{:02x}' specifies a hex format.