uniprot mapping for python3

uniprot_mapping.py

import urllib
import urllib.parse
from urllib.request import urlopen

def uniprot_mapping(fromtype, totype, identifier):
    base = 'http://www.uniprot.org'
    tool = 'mapping'

    params = {
        'from': fromtype,
        'to': totype,
        'format': 'tab',
        'query': identifier,
    }

    data = urllib.parse.urlencode(params)
    response = urlopen(f'{base}/{tool}?{data}')
    return response.read()

print(uniprot_mapping('EMBL_ID', 'ID', 'X02469'))