hex() function in Python

,The hex() function is one of the built-in functions in Python3, which is used to convert an integer number into its corresponding hexadecimal form. Hexadecimal is a base-16 numbering system commonly used in computer science and programming. In this article, we will explore the hex() function and its usage in converting decimal numbers to hexadecimal format in Python.

Python Hex() Function Syntax

Syntax: hex(x)

Parameter: x – an integer number (int object)

Returns: Returns hexadecimal string.

Python Hex() Function Example

The hex() function in Python is used to convert a decimal number to its corresponding hexadecimal representation. It takes an integer as an argument and returns a string representing the hexadecimal value.

Python3

decimal_number = 999
hexadecimal_value = hex(decimal_number)

print(hexadecimal_value)

Output

0x3e7

 Python Hex() Function For ASCII and Float Value

In Python, we can use the hex() function to convert ASCII characters to their corresponding hexadecimal representation. The ord() function is used to get the ASCII value of a character, and then hex() is applied to convert that value to hexadecimal.

Python3

# Python3 program to illustrate
# hex() function

print("The hexadecimal form of 23 is "
                            + hex(23))

print("The hexadecimal form of the "
      "ascii value is 'a' is " + hex(ord('a')))

print("The hexadecimal form of 3.9 is "
                        + float.hex(3.9))

Output

The hexadecimal form of 23 is 0x17
The hexadecimal form of the ascii value os 'a' is 0x61
The hexadecimal form of 3.9 is 0x1.f333333333333p+1

Python Hex() Function Perform Bitwise Operations

In Python we can use Hex() to perform bitwise operations. Bitwise operations are operations that manipulate individual bits within binary representations of data. Python provides various bitwise operations, such as AND, OR, XOR, NOT, etc.

Python3

hex_num1 = 0x22
hex_num2 = 0x0A

bitwise_and = hex_num1 & hex_num2
bitwise_or = hex_num1 | hex_num2

print(hex(bitwise_and))
print(hex(bitwise_or))

Output

0x2
0x2a

Python Hex() Function for Different Conversion

In Python, we can use Hex() for different conversions like hex to decimal, hex to binary, hex to string, and hex to octal. Here is an example:

Python3

# TypeConversion from decimal with base 10
# to hexadecimal form with base 16

# Taking input from user
# an integer with base 10
number = int(input("Enter a number with base 10\n"))

# The choices present to the user
print("a. Decimal to Hexadecimal ")
print("b. Decimal to Octal")
print("c. Decimal to Binary")

# taking user input
print("Enter your choice :- ")
choice = input()

# Running a variable choice
# Hexadecimal form if choice
# is set to 'a'
if choice is 'a':

    # lstrip helps remove "0x" from the left
    # rstrip helps remove "L" from the right,
    # L represents a long number
    print("Hexadecimal form of " + str(number) +
          " is " + hex(number).lstrip("0x").rstrip("L"))

if choice is 'b':

    # Octal representation is done
    # by adding a prefix "0o"
    print("Octal form of " + str(number) +
          " is " + oct(number).lstrip("0o").rstrip("L"))

if choice is 'c':

    # Binary representation is done by
    # the addition of prefix "0b"
    print("Binary form of " + str(number) +
          " is "+bin(number).lstrip("0b").rstrip("L"))

Output

input variant a)

Enter a number with base 10
123
a. Decimal to Hexadecimal 
b. Decimal to Octal
c. Decimal to Binary
Enter your choice:- 
a
Hexadecimal form of 123 is 7b

input variant b)

Enter a number with base 10
123456789
a. Decimal to Hexadecimal 
b. Decimal to Octal
c. Decimal to Binary
Enter your choice:- 
a
Hexadecimal form of 123456789 is 75bcd15

Python Hex() Function Demonstrate TypeError

Python demonstrates TypeError when floating point values are passed as parameters. 

Python3

# hex() accepts only integer values as parameters
print("The hexadecimal form of 11.1 is "
                            + hex(11.1))

'''
# The hexadecimal conversion of floating
# point integers can be done using the
# function float.hex()
print("The hexadecimal form of 11.1 is "
                    + float.hex(11.1))
# Output :
# The hexadecimal form of 11.1 is 0x1.6333333333333p+3

# Similarly, float.hex() throws a TypeError
# when integer values are passed in it.
'''

Output

Traceback (most recent call last):
  File "/home/7e1ac7e34362fd690cdb72cf294502e1.py", line 2, in 
    print("The hexadecimal form of 11.1 is "+hex(11.1))
TypeError: 'float' object cannot be interpreted as an integer

Errors and Exceptions

Typeerror :  Returns Typeerror when anything other than              
                      integer type constants are passed as parameters.

Applications
Hex() is used in all the standard conversions. For example conversion of hexadecimal to decimal, hexadecimal to octal, and hexadecimal to binary.