Retrieve Bitcoin address balance from Blockchain API

btcbal.py

#!/usr/bin/python

import sys
import getopt
import urllib2
from optparse import OptionParser

def main():
  # variables
  btcaddr = ""
  baseurl = "https://blockchain.info/q/addressbalance/"

  # build parser
  usage = "usage: %prog address"
  parser = OptionParser(usage);

  # parse argument
  (options, args) = parser.parse_args()
  if len(args) != 1:
    parser.error("incorrect number of arguments")
  else:
    btcaddr = sys.argv[1]

  # get balance
  url = baseurl + btcaddr
  response = urllib2.urlopen(url)
  html = response.read()

  # if non-zero, write to a results file!
  if (html != "0"):
    print("Found a non-zero balance at: " + url)
    print("Balance has " + html + " Satoshis")
    with open("output.log", "a") as outputfile:
      outputfile.write(btcaddr + "\t" + html)
   
if __name__ == "__main__":
   main()

i just changed your code a bit for python3:
` #!/usr/bin/python

import sys
import getopt
import urllib.request
from optparse import OptionParser

def main():

variables

btcaddr = ""
baseurl = "https://blockchain.info/q/addressbalance/"

build parser

usage = "usage: %prog address"
parser = OptionParser(usage);

parse argument

(options, args) = parser.parse_args()
if len(args) != 1:
parser.error("incorrect number of arguments")
else:
btcaddr = sys.argv[1]

get balance

url = baseurl + btcaddr
response = urllib.request.urlopen(url)
html = int(response.read())
btcbal = (html / 100000000)

if non-zero, write to a results file!

if (html != "0"):
print("Found a non-zero balance at: " + url)
print(str(btcbal) + "BTC")
with open("output.log", "a") as outputfile:
outputfile.write(btcaddr + "-balance-:" + str(btcbal) + "\n")

if name == "main":
main()
`