oct() function in Python

22 Sep, 2021
Python oct() function is one of the built-in methods, it takes an integer and returns the octal representation in a string format.
Syntax : oct(x)
Parameters :
x – Must be an integer number and can be in either binary, decimal or hexadecimal format.
Returns : octal representation of the value.
Errors and Exceptions : 
TypeError : Returns TypeError when anything other than integer type constants are passed as parameters.
Python3
# Python3 program to demonstrate# the use of oct() function print("The octal representation of 23 is " + oct(23)) print("The octal representation of the"      " ascii value of 'z' is " + oct(ord('z'))) # Binary representation of a number# can be passed as a parameter # For 23, Binary is 0b10111print("The octal representation of the binary"      " of 23 is " + oct(0b10111)) # For 23, Hexadecimal is 0x17print("The octal representation of the binary"      " of 23 is " + oct(0x17))
Output:
The octal representation of 23 is 0o27
The octal representation of the ascii value of 'z' is 0o172
The octal representation of the binary of 23 is 0o27
The octal representation of the binary of 23 is 0o27
Python3
# Python3 program demonstrating TypeError print("The Octal representation of 29.5 is " + oct(29.5)) '''# Python doesn't have anything like float.oct()# to directly convert a floating type constant# to its octal representation. Conversion of a# floating-point value to it's octal is done manually.'''
Output : 
Traceback (most recent call last):
  File "/home/5bf02b72de26687389763e9133669972.py", line 3, in 
    print("The Octal representation of 29.5 is "+oct(29.5))
TypeError: 'float' object cannot be interpreted as an integer
Applications:  oct() is used in all types of standard conversion. For example, Conversion from decimal to octal, binary to octal, hexadecimal to octal forms respectively. 
Python3
# TypeConversions from decimal and binary# to their respective octal representations # The choices present to the userprint("a. Hexadecimal to Octal ")print("b. Decimal to Octal")print("c. Binary to Octal") # Function generates octal representation# from it's binary fromdef bin_to_oct():     print("Enter your input in BIN format :-")     # taking user input as binary string and    # then using int() to convert it into it's    # respective decimal format    x = int(input(), 2)    print("Octal form of " + str(x) + " is " + oct(x)) # Function generates octal representation#  of it's hexadecimal form passed as value.def hex_to_oct():    print("Enter your input in HEX format :-")     # taking user input as hexadecimal string and    # then using int() to convert it into it's    # respective decimal format    x = int(input(), 16)    print("Octal form of " + str(x) + " is " + oct(x))  # Function converts decimal form to it's# respective octal representationdef decimal_to_oct():     print("Enter a number with base-10 format :-")     # taking a simple user input and    # converting it to an integer    x = int(input())    print("Octal form of " + str(x) + " is " + oct(x))  # Driver Codech = input("Enter your choice :-\n") if ch is 'a':    hex_to_oct()elif ch is 'b':    decimal_to_oct()elif ch is 'c':    bin_to_oct()
Output : 
a. Hexadecimal to Octal 
b. Decimal to Octal
c. Binary to Octal
Enter your choice :-
a
Enter your input in HEX format :-
0x13
Octal form of 19 is 0o23
Python3
class math:    num = 76    def __index__(self):        return self.num    def __int__(self):        return self.numobj = math()print(oct(obj))
Output:
0o114
kumar_satyam
Python-Built-in-functions
Python
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