How do I create a function that simulates the long division method of converting a decimal to another base

Enter a number: 23b4
Enter base from: 16
Enter base to convert to: 8
4 x 16 ^ 0 = 4 x 1 = 4
B x 16 ^ 1 = 11 x 16 = 176
3 x 16 ^ 2 = 3 x 256 = 768
2 x 16 ^ 3 = 2 x 4096 = 8192
23b4 base 16 is decimal 9140

9140 / 8 = 1142 , 4
1142 / 8 = 142 , 6
142 / 8 = 17 , 6
17 / 8 = 2 , 1
2 / 8 = 0 , 2
decimal 9140 is 21664 in base 8

So a general process flow is:
•	Ask for number to convert
•	Ask for base of number
•	Ask for base to convert to
•	Set decimal to return of "toDecimal" passing the number-in and base-in
•	Print message number-in base base-in is decimal decimal-value 
•	Set number-out to return of "fromDecimal" passing decimal and base-out
•	Print message decimal is number-out in base base-out

 Outline of the fromDecimal function:
•	Define a string number-out and initialize it to an empty string, i.e. ‘’ or "" (this will allow us to concatenate digits to it in a loop)
•	Set a quotient variable to the decimal passed in
•	Create while loop that checks for quotient great than zero
•	Set a remainder variable to quotient mod base-out
•	Set next-digit to return of valueToDigit passing in the remainder
•	Set a new-quotient variable to quotient integer-division base-out
•	Print this loop as: quotient / base-out = new-quotient , next-digit
•	Append next digit to front of number-out (e.g. sNumberOut = nextDigit + sNumberOut)
•	Set quotient to new-quotient
•	(Loop will continue till quotient is zero)
•	Return number-out

def digitToValue(digit, base):
    value = 0
    if digit >= '0' and digit <= '9':
        value = int(digit)
    elif digit >= 'A' and digit <= 'F':
        
        if digit == 'A': 
            value = 10
            
        elif digit == 'B': 
            value = 11
            
        elif digit == 'C': 
            value = 12
            
        elif digit == 'D': 
            value = 13
            
        elif digit == 'E': 
            value = 14
            
        else:
            value = 15 
    else:
        print("Invalid digit!")
        return -1
    
    if value < 0 or value >= base:
        print("Invalid digit for base!")
        return -1

    return value

def toDecimal (sNumber, nBase):
    decimal = 0
    
    for i in range(len(sNumber)):

        digitPos = len(sNumber) - 1 - i

        digit = sNumber[digitPos]

        digitVal = digitToValue(digit, nBase)

        if (digitVal == -1):
            return -1

        posVal = nBase ** i

        product = digitVal * posVal

        print(digit, "x", nBase, "^", i, "=", digitVal, "x", posVal, "=", product)

        decimal += product

        return decimal

    
    
numberIn = input("Enter a number: ")
baseIn = input("Enter base from: ")
convertTo = input("Enter base to convert to: ")
decimalOut = toDecimal(numberIn, baseIn)
print(decimalOut)