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Python oct() Function

The oct() function in Python is used to convert an integer into its octal string representation.

note

Octal strings in Python are prefixed with 0o.

Syntax​

oct(x)

oct() Parameters​

Python oct() function parameters:

ParameterConditionDescription
xRequiredMust be an integer number. It can be in binary, decimal, or hexadecimal format. If not an integer, it should implement the __index__() method to return an integer.

oct() Return Value​

Python oct() function returns an octal string from the given integer number.

Examples​

Example 1: Basic Octal Conversion​

Let's convert a decimal number to its octal representation.

integer_number = 219
octal_number = oct(integer_number)
print(octal_number) # Output: 0o333

output

0o333

Other examples:

print(oct(123))     # Output: 0o173
print(oct(456))     # Output: 0o710
print(oct(789))     # Output: 0o1425
print(oct(10000))   # Output: 0o23420

output

0o173
0o710
0o1425
0o23420

Example 2: Octal Conversion of a Negative Integer​

integer_number = -219
octal_number = oct(integer_number)
print(octal_number) # Output: -0o333

output

-0o333

Other examples:

print(oct(-123))     # Output: -0o173
print(oct(-456))     # Output: -0o710
print(oct(-789))     # Output: -0o1425
print(oct(-10000))   # Output: -0o23420

output

-0o173
-0o710
-0o1425
-0o23420

Example 3: Converting Binary number to Octal​

binary_number = 0b1010
octal_number = oct(binary_number)
print(octal_number)

output

0o12

Other examples:

print(oct(0b111))     # Output: 0o7
print(oct(0b1001))    # Output: 0o11
print(oct(0b1011))    # Output: 0o13
print(oct(0b10000))   # Output: 0o20

output

0o7
0o11
0o13
0o20

Example 4: Converting Hexadecimal number to Octal​

hexadecimal_number = 0xA21
octal_number = oct(hexadecimal_number)
print(octal_number)

output

0o5041

Other examples:

print(oct(0xA53))      # Output: 0o5123
print(oct(0xAA11))     # Output: 0o125021
print(oct(0xABCD))     # Output: 0o125715
print(oct(0xA1B2C3))   # Output: 0o50331303

output

0o5123
0o125021
0o125715
0o50331303

Example 5: Handling TypeError for Floating Point Values​

The oct() function can not handle floating point values, si it will raise a TypeError exception.

floating_number =  12.3

# This will raise a TypeError because oct() ca nnot handle floating point values.
octal_number = oct(floating_number)

output

Traceback (most recent call last):
  File "main.py", line 4, in <module>
    octal_number = oct(floating_number)
TypeError: 'float' object cannot be interpreted as an integer

Example 6: Custom Objects with __int__() Method​

In this example, a custom class MyClass is defined with an __int__() method to support octal conversion. The oct() function is then used on an instance of this class.

class MyClass:
    def __int__(self):
        return  10

a = MyClass()
result = oct(int(a)) # 10 in decimal = 12 in octal
print(result) # Output: 0o12

output

0o12

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