Functions to read and write numbers represented in various bases

repr.py

# bases.py - Copyright 2010, Humberto Ortiz-Zuazaga humberto.ortiz@upr.edu
# Functions to read and write numbers represented in various bases

digits = "0123456789ABCDEF" # digits for bases 2 - 16

def readnum(numstring, base):
    "Read a string of digits in base BASE, and compute the correct decimal value"
    value = 0
    for i in range(len(numstring)):
        value = value * base
        value = value + digits.index(numstring[i])

    return value

def repr(value, base):
    "Return a string representation of the decimal value VALUE in the base BASE."
    numstring = ""

    quotient = value
    while quotient > 0:
        remainder = quotient % base
        numstring = digits[remainder] + numstring
        quotient = quotient / base
    return numstring

print repr(readnum("100", 10), 10)