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BUILD.py
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BUILD.py
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"""Build the tutorial data files from the IMDB *.list.gz files."""
import csv
import gzip
import os
import re
from datetime import datetime
split_on_tabs = re.compile(b'\t+').split
def main():
os.chdir(os.path.dirname(os.path.abspath(__file__)))
if not os.path.isdir('../data'):
os.makedirs('../data')
# Load movie titles.
titles = set()
uninteresting_titles = set()
lines = iter(gzip.open('genres.list.gz'))
line = next(lines)
while line != b'8: THE GENRES LIST\n':
line = next(lines)
assert next(lines) == b'==================\n'
assert next(lines) == b'\n'
print('Reading "genres.list.gz" to find interesting movies')
for line in lines:
if not_a_real_movie(line):
continue
fields = split_on_tabs(line.strip(b'\n'))
raw_title = fields[0]
genre = fields[1]
try:
raw_title.decode('ascii')
except UnicodeDecodeError:
continue
if genre in (b'Adult', b'Documentary', b'Short'):
uninteresting_titles.add(raw_title)
else:
titles.add(raw_title)
interesting_titles = titles - uninteresting_titles
del titles
del uninteresting_titles
print('Found {0} titles'.format(len(interesting_titles)))
print('Writing "titles.csv"')
with open('../data/titles.csv', 'w') as f:
output = csv.writer(f)
output.writerow(('title', 'year'))
for raw_title in interesting_titles:
title_and_year = parse_title(raw_title)
output.writerow(title_and_year)
print('Finished writing "titles.csv"')
print('Reading release dates from "release-dates.list.gz"')
lines = iter(gzip.open('release-dates.list.gz'))
line = next(lines)
while line != b'RELEASE DATES LIST\n':
line = next(lines)
assert next(lines) == b'==================\n'
output = csv.writer(open('../data/release_dates.csv', 'w'))
output.writerow(('title', 'year', 'country', 'date'))
for line in lines:
if not_a_real_movie(line):
continue
if line.startswith(b'----'):
continue
fields = split_on_tabs(line.strip(b'\n'))
if len(fields) > 2: # ignore "DVD premier" lines and so forth
continue
raw_title = fields[0]
if raw_title not in interesting_titles:
continue
title, year = parse_title(raw_title)
if title is None:
continue
country, datestr = fields[1].decode('ascii').split(':')
try:
date = datetime.strptime(datestr, '%d %B %Y').date()
except ValueError:
continue # incomplete dates like "April 2014"
output.writerow((title, year, country, date))
print('Finished writing "release_dates.csv"')
output = csv.writer(open('../data/cast.csv', 'w'))
output.writerow(('title', 'year', 'name', 'type', 'character', 'n'))
for role_type, filename in (
('actor', 'actors.list.gz'),
('actress', 'actresses.list.gz'),
):
print('Reading {0!r}'.format(filename))
lines = iter(gzip.open(filename))
line = next(lines)
while (b'Name' not in line) or (b'Titles' not in line):
line = next(lines)
assert b'----' in next(lines)
for line in lines:
if line.startswith(b'----------------------'):
break
line = line.rstrip()
if not line:
continue
fields = split_on_tabs(line.strip(b'\n'))
if fields[0]:
name = decode_ascii(fields[0])
name = swap_names(name)
if len(fields) < 2:
raise ValueError('broken line: {!r}'.format(line))
if not_a_real_movie(fields[1]):
continue
fields = fields[1].split(b' ')
raw_title = fields[0]
if raw_title not in interesting_titles:
continue
if len(fields) < 2:
continue
if fields[1].startswith(b'('): # uncredited, archive footage, etc
del fields[1]
if len(fields) < 2:
continue
if not fields[1].startswith(b'['):
continue
character = decode_ascii(fields[1].strip(b'[]'))
if len(fields) > 2 and fields[2].startswith(b'<'):
n = int(fields[2].strip(b'<>'))
else:
n = ''
title, year = parse_title(raw_title)
if title is None:
continue
if character == 'N/A':
clist = ['(N/A)']
else:
clist = character.split('/')
for character in clist:
if not character:
continue
output.writerow((title, year, name, role_type, character, n))
print('Finished writing "cast.csv"')
def not_a_real_movie(line):
return (
line.startswith(b'"') # TV show
or b'{' in line # TV episode
or b' (????' in line # Unknown year
or b' (TV)' in line # TV Movie
or b' (V)' in line # Video
or b' (VG)' in line # Video game
)
match_title = re.compile(r'^(.*) \((\d+)(/[IVXL]+)?\)$').match
def parse_title(raw_title):
try:
title = raw_title.decode('ascii')
except UnicodeDecodeError:
return None, None
m = match_title(title)
title = m.group(1)
year = int(m.group(2))
numeral = m.group(3)
if numeral is not None:
numeral = numeral.strip('/')
if numeral != 'I':
title = '{0} ({1})'.format(title, numeral)
return title, year
def swap_names(name):
if name.endswith(' (I)'):
name = name[:-4]
if ',' in name:
last, first = name.split(',', 1)
name = first.strip() + ' ' + last.strip()
return name
def decode_ascii(s):
return s.decode('ascii', 'replace').replace(u'\ufffd', u'?')
if __name__ == '__main__':
main()