from oboparse import obo_parser, parse_result_to_networkx
from urllib.request import urlopen
from io import TextIOWrapper

with urlopen('http://purl.obolibrary.org/obo/go.obo') as f:
    parse_result = obo_parser.parseFile(TextIOWrapper(f), parseAll=True)
    parse_result.pprint()
    
graph = parse_result_to_networkx(parse_result)