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Input a number in octal format in Python

Python | Octal Input: Here, we are going to learn how to input a number in Octal format in Python programming language?
Submitted by IncludeHelp, on April 27, 2020

Syntax to convert octal value to an integer (decimal format),

    int(oct_value, 8)

Here,

• oct_value should contain the valid octal value
• 8 is the base value of the octal number system

Note: oct_value must contain only octal digits (0, 1, 2, 3 ,4 ,5 ,6, 7), if it contains other than these digits a "ValueError" will return.

Program to convert given octal value to integer (decimal)

# function to convert given octal Value
# to an integer (decimal number)
def OctToDec(value):
  try:
    return int(value, 8)
  except ValueError:
    return "Invalid Octal Value"

# Main code
input1 = "1234567"
input2 = "7001236"
input3 = "1278"

print(input1, "as decimal: ", OctToDec(input1))
print(input2, "as decimal: ", OctToDec(input2))
print(input3, "as decimal: ", OctToDec(input3))

Output

1234567 as decimal:  342391
7001236 as decimal:  1835678
1278 as decimal:  Invalid Octal Value

Now, we are going to implement the program – that will take input the number as an octal number and printing it in the decimal format.

Program to input a number in octal format

# input number in octal format and 
# converting it into decimal format

try:
  num = int(input("Input octal value: "), 8)
  print("num (decimal format):", num)
  print("num (octal format):", oct(num))  
except ValueError:
  print("Please input only octal value...")

Output

RUN 1:
Input octal value: 1234567
num (decimal format): 342391
num (octal format): 0o1234567

RUN 2:
Input octal value: 12700546
num (decimal format): 2851174
num (octal format): 0o12700546

RUN 3:
Input octal value: 12807
Please input only octal value...