python script to translate my chinese srt files into english!

trans_srt.py

#!/usr/bin/python3

import sys
import re
import json
import html.parser

import urllib.parse as p
import urllib.request as r

def prnt(str):
  print(str, end="")

def openfile():
  file = sys.argv[1]
  try:
    return open(file, "r")
  except:
    print("failed to open %s." % file)
    sys.exit(1)

is_frame = re.compile("^\d+$")
is_empty = re.compile("^$")
is_time = re.compile("^\d+:\d+:\d+,\d+ --> \d+:\d+:\d+,\d+$")

def subtext(line):
  f = is_frame.match(line)
  t = is_time.match(line)
  e = is_empty.match(line)
  return not (f or e or t)

API_KEY="GETYOUROWN"

def translate(line):
  url = "https://www.googleapis.com/language/translate/v2?"
  data = p.urlencode({ "key": API_KEY
                     , "q": line
                     , "source": "zh"
                     , "target": "en"
                     })
  f = r.urlopen(url + data)
  c = f.read().decode()
  f.close()
  j = json.loads(c)
  t = j['data']['translations'][0]['translatedText']
  g = html.parser.HTMLParser().unescape(t)
  return g

for line in openfile():
  if subtext(line):
    prnt(translate(line) + "\n")
  else:
    prnt(line)