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#
# htmlTableParser.py
#
# Example of parsing a simple HTML table into a list of rows, and optionally into a little database
#
# Copyright 2019, Paul McGuire
#
import pyparsing as pp
import urllib.request
# define basic HTML tags, and compose into a Table
table, table_end = pp.make_html_tags("table")
thead, thead_end = pp.make_html_tags("thead")
tbody, tbody_end = pp.make_html_tags("tbody")
tr, tr_end = pp.make_html_tags("tr")
th, th_end = pp.make_html_tags("th")
td, td_end = pp.make_html_tags("td")
a, a_end = pp.make_html_tags("a")
# method to strip HTML tags from a string - will be used to clean up content of table cells
strip_html = (pp.any_open_tag | pp.any_close_tag).suppress().transform_string
# expression for parsing <a href="url">text</a> links, returning a (text, url) tuple
link = pp.Group(a + a.tag_body("text") + a_end.suppress())
def extract_text_and_url(t):
return (t[0].text, t[0].href)
link.addParseAction(extract_text_and_url)
# method to create table rows of header and data tags
def table_row(start_tag, end_tag):
body = start_tag.tag_body
body.add_parse_action(pp.token_map(str.strip), pp.token_map(strip_html))
row = pp.Group(
tr.suppress()
+ (start_tag.suppress() + body + end_tag.suppress())[...]
+ tr_end.suppress()
)
return row
th_row = table_row(th, th_end)
td_row = table_row(td, td_end)
# define expression for overall table - may vary slightly for different pages
html_table = (
table
+ tbody
+ th_row[...]("headers")
+ td_row[...]("rows")
+ tbody_end
+ table_end
)
# read in a web page containing an interesting HTML table
with urllib.request.urlopen(
"https://en.wikipedia.org/wiki/List_of_tz_database_time_zones"
) as page:
page_html = page.read().decode()
tz_table = html_table.searchString(page_html)[0]
# convert rows to dicts
rows = [dict(zip(tz_table.headers[0], row)) for row in tz_table.rows]
# make a dict keyed by TZ database identifier
# (get identifier key from second column header)
identifier_key = tz_table.headers[0][1]
tz_db = {row[identifier_key]: row for row in rows}
from pprint import pprint
pprint(tz_db["America/Chicago"])
pprint(tz_db["Zulu"])