pokemon catcher

import os, pycurl
from io import BytesIO, StringIO
from lxml import etree

class get_pokemon(object):
  def __init__(self, save_folder):
    self.index_url = 'https://pokemondb.net/pokedex/national'
    self.img_url = 'https://img.pokemondb.net/artwork/{}.jpg'
    self.save_folder = save_folder
    if not os.path.exists(self.save_folder):
      os.mkdir(self.save_folder)
    self.make_index()

  def _GET(self, url):
    buffer = BytesIO()
    c = pycurl.Curl()
    c.setopt(c.URL, url)
    c.setopt(pycurl.USERAGENT, 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36')
    c.setopt(c.WRITEDATA, buffer)
    c.perform()
    c.close()
    return buffer

  def make_index(self):
    buffer = self._GET(self.index_url)
    html_doc = etree.HTML(buffer.getvalue())
    self.span = html_doc.findall(".//span[@class='infocard-lg-data text-muted']")
    self.pokemon_index = {s.find("./small").text:s.find("./a").text.lower() for s in span}

  def get_pokemon(self, _id):
    pokemon_name = self.pokemon_index["#" + format(_id, "03d")]
    if set(pokemon_name) & set("♀♂é"):
      pokemon_name = pokemon_name.replace("♀", "-f").replace("♂", "-m").replace("é", "e")
    img_url = self.img_url
    url = img_url.format(pokemon_name)
    img = self._GET(url)
    filename = "%03d_%s.jpg" % (_id, pokemon_name)
    with open(os.path.join(self.save_folder, filename), 'wb') as out:
      out.write(img.getbuffer())

pokemon_ball = get_pokemon(os.path.join(os.getcwd(), "pokemon"))
for i in range(1, 810):
  pokemon_ball.get_pokemon(i)