decimal = int(input("Enter a decimal integer greater than 0: "))

print("Quotient Remainder Octal")
bstring = " "
while decimal > 0:
    remainder = decimal % 8
    decimal = decimal // 8
    bstring = str(remainder) + bstring
    print ("%5d%8d%12s" % (decimal, remainder, bstring))
print("The octal representation is", bstring)

oct(42) # '052'

int('052', 8) # 42

def dec2base():
a= int(input('Enter decimal number: t'))
d= int(input('Enter expected base: t'))
b = ""
while a != 0:
    x = '0123456789ABCDEF'
    c = a % d
    c1 = x[c]
    b = str(c1) + b
    a = int(a // d)
return (b)

def dec2base_R():
a= int(input('Enter start decimal number:t'))
e= int(input('Enter end decimal number:t'))
d= int(input('Enter expected base:t'))
for i in range (a, e):
    b = ""
    while i != 0:
        x = '0123456789ABCDEF'
        c = i % d
        c1 = x[c]
        b = str(c1) + b
        i = int(i // d)
    return (b)

def todec():
c = int(input('Enter base of the number to convert to decimal:t'))
a = (input('Then enter the number:t ')).upper()
b = list(a)
s = 0
x = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F']
for pos, digit in enumerate(b[-1::-1]):
    y = x.index(digit)
    if int(y)/c >= 1:
            print('Invalid input!!!')
            break
    s =  (int(y) * (c**pos)) + s
return (s)

def decimal_to_octal(number):
    i = 1
    octal = 0
    while (number != 0):
        reminder = number % 8
        number /= 8
        octal += reminder * i
        i *= 10
    return octal
>> print decimal_to_octal(100)
>> 144

def octal_to_decimal(number):
    i = 1
    decimal = 0
    while (number != 0):
        reminder = number % 10
        number /= 10
        decimal += reminder * i
        i *= 8
    return decimal
>> print octal_to_decimal(100)
>> 64