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113 lines
4.7 KiB
Python
113 lines
4.7 KiB
Python
# coding: utf-8
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from __future__ import unicode_literals
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import re
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import bz2
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import json
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import datetime
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# TODO: remove hardcoded paths
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WIKIDATA_JSON = 'C:/Users/Sofie/Documents/data/wikidata/wikidata-20190304-all.json.bz2'
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def read_wikidata_entities_json(limit=None, to_print=False):
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""" Read the JSON wiki data and parse out the entities. Takes about 7u30 to parse 55M lines. """
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lang = 'en'
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prop_filter = {'P31': {'Q5', 'Q15632617'}} # currently defined as OR: one property suffices to be selected
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site_filter = 'enwiki'
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title_to_id = dict()
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id_to_descr = dict()
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# parse appropriate fields - depending on what we need in the KB
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parse_properties = False
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parse_sitelinks = True
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parse_labels = False
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parse_descriptions = True
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parse_aliases = False
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with bz2.open(WIKIDATA_JSON, mode='rb') as file:
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line = file.readline()
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cnt = 0
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while line and (not limit or cnt < limit):
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if cnt % 500000 == 0:
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print(datetime.datetime.now(), "processed", cnt, "lines of WikiData dump")
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clean_line = line.strip()
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if clean_line.endswith(b","):
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clean_line = clean_line[:-1]
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if len(clean_line) > 1:
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obj = json.loads(clean_line)
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entry_type = obj["type"]
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if entry_type == "item":
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# filtering records on their properties
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keep = False
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claims = obj["claims"]
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for prop, value_set in prop_filter.items():
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claim_property = claims.get(prop, None)
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if claim_property:
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for cp in claim_property:
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cp_id = cp['mainsnak'].get('datavalue', {}).get('value', {}).get('id')
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cp_rank = cp['rank']
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if cp_rank != "deprecated" and cp_id in value_set:
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keep = True
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if keep:
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unique_id = obj["id"]
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if to_print:
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print("ID:", unique_id)
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print("type:", entry_type)
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# parsing all properties that refer to other entities
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if parse_properties:
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for prop, claim_property in claims.items():
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cp_dicts = [cp['mainsnak']['datavalue'].get('value') for cp in claim_property if cp['mainsnak'].get('datavalue')]
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cp_values = [cp_dict.get('id') for cp_dict in cp_dicts if isinstance(cp_dict, dict) if cp_dict.get('id') is not None]
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if cp_values:
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if to_print:
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print("prop:", prop, cp_values)
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if parse_sitelinks:
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site_value = obj["sitelinks"].get(site_filter, None)
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if site_value:
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site = site_value['title']
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if to_print:
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print(site_filter, ":", site)
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title_to_id[site] = unique_id
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if parse_labels:
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labels = obj["labels"]
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if labels:
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lang_label = labels.get(lang, None)
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if lang_label:
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if to_print:
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print("label (" + lang + "):", lang_label["value"])
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if parse_descriptions:
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descriptions = obj["descriptions"]
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if descriptions:
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lang_descr = descriptions.get(lang, None)
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if lang_descr:
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if to_print:
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print("description (" + lang + "):", lang_descr["value"])
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id_to_descr[unique_id] = lang_descr["value"]
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if parse_aliases:
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aliases = obj["aliases"]
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if aliases:
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lang_aliases = aliases.get(lang, None)
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if lang_aliases:
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for item in lang_aliases:
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if to_print:
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print("alias (" + lang + "):", item["value"])
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if to_print:
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print()
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line = file.readline()
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cnt += 1
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return title_to_id, id_to_descr
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