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web_scraping.py
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import requests
from bs4 import BeautifulSoup
import json
import requests
from multiprocessing import Pool, cpu_count
from format_table_row import formatStar, formatSystem, getImages, formatStarFiveTds, formatStarSixTds, formatStarSevenTds, formatStarNineTds, formatStarNineTdsWithConstelation
URL = "https://en.wikipedia.org/wiki/List_of_nearest_stars_and_brown_dwarfs"
session = requests.Session()
def printPage():
# Scrapping
page = requests.get(URL)
soup = BeautifulSoup(page.content, "html.parser")
tables = soup.find('table', class_='mw-collapsible')
trs = tables.find_all('tr')
result = []
if cpu_count() >= 4:
print("Using Multiprocessing")
# Transforming each object from HTML to string for use with multiprocessing
trsString = []
for tr in trs:
trsString.append(str(tr))
longitud = len(trsString) - 1
# Calculate the different point to make the division by 4
point1 = longitud // 4
point2 = 2 * longitud // 4
point3 = 3 * longitud // 4
# Divide the trsString by four parts
part1 = trsString[:point1]
part2 = trsString[point1:point2]
part3 = trsString[point2:point3]
part4 = trsString[point3:]
arrays = [part1, part2, part3, part4]
p = Pool()
results = p.map(processAllTrsMultiprocessing, arrays)
p.terminate()
p.join()
result = results[0] + results[1] + results[2] + results[3]
else:
print("Normal using")
result = processAllTrs(trs)
return json.dumps(result)
def processAllTrsMultiprocessing(trs):
# Formatting objects
systemsFormatted = []
# Common columns with the stars
distance = 0
constellation = ''
coordinates = ''
parallax = ''
notes = ''
for tr in trs:
trParsed = BeautifulSoup(tr, 'html.parser')
tds = trParsed.find_all('td')
if len(tds) == 10:
star = processSingleStar(tds)
systemsFormatted.append(star)
if len(tds) == 11:
system = processSystemWithStars(tds)
systemsFormatted.append(system)
distance = system['stars'][0]["distance"]
constellation = system['stars'][0]['constellation']
coordinates = system['stars'][0]['coordinates']
parallax = system['stars'][0]['stellarParallax']
notes = system['stars'][0]['notes']
if len(tds) == 5:
star = processStarWithFiveTds(tds)
star['distance'] = distance
star['constellation'] = constellation
star['coordinates'] = coordinates
star['stellarParallax'] = parallax
star['notes'] = notes
index = 0 if len(systemsFormatted) - 1 == -1 else len(systemsFormatted) - 1
systemsFormatted[index]['stars'].append(star)
if len(tds) == 6:
star = processStarWithSixTds(tds)
star['distance'] = distance
star['constellation'] = constellation
star['stellarParallax'] = parallax
index = 0 if len(systemsFormatted) - 1 == -1 else len(systemsFormatted) - 1
systemsFormatted[index]['stars'].append(star)
if len(tds) == 7:
star = processStarWithSevenTds(tds)
star['distance'] = distance
star['constellation'] = constellation
star['stellarParallax'] = parallax
index = 0 if len(systemsFormatted) - 1 == -1 else len(systemsFormatted) - 1
systemsFormatted[index]['stars'].append(star)
if len(tds) == 9:
hasConstellation = False
for td in tds:
if td.attrs.get("style"):
if td.attrs["style"] == "background-color: pink":
hasConstellation = True
if hasConstellation:
star = processSingleStar(tds)
systemsFormatted.append(star)
else:
star = processStarWithNineTds(tds)
star['distance'] = distance
star['stellarParallax'] = parallax
index = 0 if len(systemsFormatted) - 1 == -1 else len(systemsFormatted) - 1
systemsFormatted[index]['stars'].append(star)
return systemsFormatted
def processAllTrs(trs):
# Formatting objects
systemsFormatted = []
# Common columns with the stars
distance = 0
constellation = ''
coordinates = ''
parallax = ''
notes = ''
for tr in trs:
tds = tr.find_all('td')
if len(tds) == 10:
star = processSingleStar(tds)
systemsFormatted.append(star)
if len(tds) == 11:
system = processSystemWithStars(tds)
systemsFormatted.append(system)
distance = system['stars'][0]["distance"]
constellation = system['stars'][0]['constellation']
coordinates = system['stars'][0]['coordinates']
parallax = system['stars'][0]['stellarParallax']
notes = system['stars'][0]['notes']
if len(tds) == 5:
star = processStarWithFiveTds(tds)
star['distance'] = distance
star['constellation'] = constellation
star['coordinates'] = coordinates
star['stellarParallax'] = parallax
star['notes'] = notes
index = 0 if len(systemsFormatted) - 1 == -1 else len(systemsFormatted) - 1
systemsFormatted[index]['stars'].append(star)
if len(tds) == 6:
star = processStarWithSixTds(tds)
star['distance'] = distance
star['constellation'] = constellation
star['stellarParallax'] = parallax
index = 0 if len(systemsFormatted) - 1 == -1 else len(systemsFormatted) - 1
systemsFormatted[index]['stars'].append(star)
if len(tds) == 7:
star = processStarWithSevenTds(tds)
star['distance'] = distance
star['constellation'] = constellation
star['stellarParallax'] = parallax
index = 0 if len(systemsFormatted) - 1 == -1 else len(systemsFormatted) - 1
systemsFormatted[index]['stars'].append(star)
if len(tds) == 9:
hasConstellation = False
for td in tds:
if td.attrs.get("style"):
if td.attrs["style"] == "background-color: pink":
hasConstellation = True
if hasConstellation:
star = processSingleStar(tds)
systemsFormatted.append(star)
else:
star = processStarWithNineTds(tds)
star['distance'] = distance
star['stellarParallax'] = parallax
index = 0 if len(systemsFormatted) - 1 == -1 else len(systemsFormatted) - 1
systemsFormatted[index]['stars'].append(star)
return systemsFormatted
def processSingleStar(tds):
systemObject = { "systemName": "N/A" }
starObject = {}
starsArray = []
for td in enumerate(tds):
propertyKey, objectFormatted, images = formatStar(td, session)
if images != None:
starObject['images'] = images
starObject[propertyKey] = objectFormatted
starsArray.append(starObject)
systemObject["stars"] = starsArray
return systemObject
def processSystemWithStars(tds):
systemObject = {}
starObject = {}
starsArray = []
for td in enumerate(tds):
propertyKey, objectFormatted = formatSystem(td)
if propertyKey == "systemName":
systemObject[propertyKey] = objectFormatted
else:
starObject[propertyKey] = objectFormatted
starLink = tds[1].find_all("a")
hrefs = starLink
if len(starLink) == 0:
hrefs = tds[0].find_all("a")
images = getImages("https://en.wikipedia.org" + hrefs[0].attrs["href"], session)
starObject['images'] = images
starsArray.append(starObject)
systemObject["stars"] = starsArray
return systemObject
def processStarWithFiveTds(tds):
starObject = {}
for td in enumerate(tds):
propertyKey, objectFormatted = formatStarFiveTds(td)
starObject[propertyKey] = objectFormatted
return starObject
def processStarWithSixTds(tds):
starObject = {}
for td in enumerate(tds):
propertyKey, objectFormatted = formatStarSixTds(td)
starObject[propertyKey] = objectFormatted
return starObject
def processStarWithSevenTds(tds):
starObject = {}
for td in enumerate(tds):
propertyKey, objectFormatted = formatStarSevenTds(td)
starObject[propertyKey] = objectFormatted
return starObject
def processStarWithNineTds(tds):
starObject = {}
for td in enumerate(tds):
propertyKey, objectFormatted = formatStarNineTds(td)
starObject[propertyKey] = objectFormatted
return starObject