Python base converter
Converts from any base less than or equal to 36 to any other base less than or equal to 36. This is my first python program so it is definitely not amazing, but I don’t think I did too bad.
My verdict on python, the interpreter works great for the quick scripts, but dynamic typing drives me crazy. For ex. trying to iterate through all the letters in the input it tries to treat it as an int and complains. Just seems too unpredictable and hard to catch errors. I get a feeling like there are a ton of errors waiting to happen : (
Anyway, here is the code, enjoy : )
'''
Created on Sep 6, 2009
@author: syfran
'''
def convert(oBase, oNum, newBase):
if(oBase > 36 or newBase > 36):
print "Please use a base lower than or equal to 36"
quit()
numToLett = {10:"A", 11:"B", 12:"C", 13:"D", 14:"E", 15:"F", 16:"G", 17:"H", 18:"I", 19:"J", 20:"K", 21:"L", 22:"M", 23:"N", 24:"O", 25:"P", 26:"Q", 27:"R", 28:"S", 29:"T", 30:"U", 31:"V", 32:"W", 33:"X", 34:"Y", 35:"Z"}
# returns a function that is used to quickly calculate a power
def getToPower(base):
def toPower(exponent):
return pow(base, exponent)
return toPower
# converts the list into a solid string
def listToString(list):
returnString = ""
for letter in list:
returnString += str(letter)
return returnString
def replaceAlpha(num):
for value in numToLett:
if num.upper() == numToLett[value]:
return value
def addAlpha(num):
return numToLett[num]
newNum = []
oBasePower = getToPower(oBase)
newBasePower = getToPower(newBase)
# first convert to decimal
deci = 0
exp = len(oNum) - 1
for digit in oNum:
if digit.isalpha():
digit = replaceAlpha(digit)
deci += oBasePower(exp) * int(digit)
exp -= 1
# find the highest possible starting number for the new Base
exp = 0
while deci >= newBasePower(exp + 1):
exp += 1
# break it down into the divisors
while exp >= 0:
coeff = deci / newBasePower(exp)
deci -= newBasePower(exp) * coeff
if coeff > 9:
coeff = addAlpha(coeff)
newNum.append(coeff);
exp -= 1
# return
return listToString(newNum)
def run():
num = raw_input("Please enter number")
originalBase = raw_input("Please enter starting base")
newBase = raw_input("Please enter new Base")
print convert(int(originalBase),str(num),int(newBase))
if __name__ == '__main__':
run()
