USED FOR SHORT URL SERVICE - 10 base and 62 base number conversion

swap1062.py

# USED FOR SHORT URL SERVICE
# 10 base number and 62 based number convertion
# used for 62 based code convert to primary key in database
# only number large than and equal to 0 works
# 
# by Kanch -> kanch is me @ gmail . com
#        http://akakanch.com
#
from math import pow

base62 = [ "0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z" ]

def swap1062(val):
    # covert 10 base to 62 base
    bits = []
    while val/62 > 0:
        bi = val%62
        val//=62
        bits.append(bi)
    bits.append(val)       # value it's now from lower bits to higher 
    #print(bits)
    return "".join([ base62[x] for x in bits ])


def swap6210(val):
    # convert 62 base to 10 base
    bits = [ base62.index(x) for x in val ]
    pk = [ int(x*pow(62,bits.index(x))) for x in bits ]
    return sum(pk)


if __name__ == "__main__":
    print("test for swap1062():")
    print("\t" + swap1062(44354))
    print("\t" + swap1062(0))
    print("\t" + swap1062(443542342123))
    print("test for swap6210():")
    print("\t" + str(swap6210("oxb0")) + "\t\treal=oxb0")
    print("\t" + str(swap6210("VTs49O70")) + "\t\treal=443542342123")
    print("\t" + str(swap6210("0")) + "\t\treal=0")

    for i in range(100000): # less than 1 sec to process
        swap1062(i)