Python hex() Function
Python3 Built-in Functionshex()It is a built-in function in Python used to convert an integer to a hexadecimal string.
Hexadecimal is a commonly used numeral system in computers, where digits 0-9 and letters a-f represent values 10-15.hex()The function is commonly used in scenarios such as debugging, color codes, memory addresses, etc.
Word Definition： hexIt is the abbreviation for hexadecimal.
Basic Syntax and Parameters
Syntax Format
hex(x)
Parameter Description
- Parameter x：
- Type: Integer
- Description: The integer to be converted to hexadecimal.
Function Description
- Return Value: Returns a hexadecimal string starting with "0x".
Examples
Example 1: Basic Usage
Example
# Basic conversion
print(hex(10)) # Output: 0xa
print(hex(255)) # Output: 0xff
print(hex(256)) # Output: 0x100
# Negative numbers (will display a minus sign)
print(hex(-10)) # Output: -0xa
print(hex(-255)) # Output: -0xff
# Zero
print(hex(0)) # Output: 0x0
# Large number
print(hex(16)) # Output: 0x10
print(hex(255)) # Output: 0xff
print(hex(4096)) # Output: 0x1000
print(hex(10)) # Output: 0xa
print(hex(255)) # Output: 0xff
print(hex(256)) # Output: 0x100
# Negative numbers (will display a minus sign)
print(hex(-10)) # Output: -0xa
print(hex(-255)) # Output: -0xff
# Zero
print(hex(0)) # Output: 0x0
# Large number
print(hex(16)) # Output: 0x10
print(hex(255)) # Output: 0xff
print(hex(4096)) # Output: 0x1000
Expected output:
0xa 0xff 0x100 -0xa -0xff 0x0 0x10 0xff 0x1000
Code Analysis:
- The returned string starts with "0x", indicating hexadecimal.
- Letters use lowercase (a-f) by default.
- Negative numbers display a minus sign.
Example 2: Practical Application
Example
# Color code conversion
r, g, b = 255, 128, 0
color = f"#{hex(r)[2:]:0>2}{hex(g)[2:]:0>2}{hex(b)[2:]:0>2}"
print(color) # Output: #ff8000
# Using formatting
print(f"{10:#x}") # Output: 0xa
print(f"{255:#x}") # Output: 0xff
print(f"{255:x}") # Output: ff
# Remove the 0x prefix
s = hex(255)
print(s[2:]) # Output: ff
print(s.replace("0x", "")) # Output: ff
r, g, b = 255, 128, 0
color = f"#{hex(r)[2:]:0>2}{hex(g)[2:]:0>2}{hex(b)[2:]:0>2}"
print(color) # Output: #ff8000
# Using formatting
print(f"{10:#x}") # Output: 0xa
print(f"{255:#x}") # Output: 0xff
print(f"{255:x}") # Output: ff
# Remove the 0x prefix
s = hex(255)
print(s[2:]) # Output: ff
print(s.replace("0x", "")) # Output: ff
Expected output:
#FF8000 0xa 0xff ff ff ff
Hexadecimal is commonly used in scenarios such as color codes, debug output, etc.
Other Extensions