freeCodeCamp/guide/english/python/hex-functions/index.md

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---
title: Python Hex Function
---
`hex(x)` is a built-in function in Python 3 to convert an integer number to a lowercase <a href='https://www.mathsisfun.com/hexadecimals.html' target='_blank' rel='nofollow'>hexadecimal</a> string prefixed with “0x”.
## Argument
This function takes one argument, `x`, that should be of integer type.
## Return
This function returns a lowercase hexadecimal string prefixed with "0x".
## Example
print(hex(16)) # prints 0x10
print(hex(-298)) # prints -0x12a
print(hex(543)) # prints 0x21f
![:rocket:](//forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=2 ":rocket:") <a href='https://repl.it/CV0S' target='_blank' rel='nofollow'>Run Code</a>
<a href='https://docs.python.org/3/library/functions.html#hex' target='_blank' rel='nofollow'>Official Documentation</a>