HQ9+ implementation in Python3

HQ9p.py

#!/bin/python3
import sys

if len(sys.argv)<=1:
    print('Usage: python3 HQ9p.py codefile',file=sys.stderr)
    exit(1)

with open(sys.argv[1]) as codefile:
    code=codefile.readline().rstrip('\n')

accumulator=0

for op in code:

    if op=='H':
        print('Hello, World!',flush=True)

    elif op=='Q':
        print(code,end='',flush=True)

    elif op=='9':
        for i in range(99,1,-1):
            print(str(i)
              +' bottles of beer on the wall, '
              +str(i)
              +' bottles of beer.\n'
              +'Take one down, pass it around, '
              +str(i-1)
              +(' bottle' if i-1==1 else ' bottles')
              +' of beer on the wall.\n',flush=True)

        print('1 bottle of beer on the wall, '
          +'1 bottle of beer.\n'
          +'Take one down, pass it around, '
          +'No bottles of beer on the wall.',flush=True)

    elif op=='+':
        accumulator+=1