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scraper.py
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scraper.py
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# -*- coding: utf-8 -*-
#########################################################
#
# Alejandro German
#
# https://github.com/seralexger/datacamp-download
#
#########################################################
import requests
import time
import random
import json
import re
import os
from lxml import html
from lxml import etree
class DataCamp:
session = requests.Session()
def __init__(self, user_email, user_pass):
if not os.path.exists('courses'):
os.makedirs('courses')
if not os.path.exists('courses/courses_data'):
os.makedirs('courses/courses_data')
self.session.headers.update({'user-agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36'})
r = self.session.get('https://www.datacamp.com/users/sign_in')
tree = html.fromstring(r.content)
authenticity_token = tree.xpath('//input[@name="authenticity_token"]/@value')[0]
user_sign = self.sign_in(user_email, user_pass, authenticity_token)
def sign_in(self, user_email, user_pass, authenticity_token):
data = [
('utf8', '\u2713'),
('authenticity_token', authenticity_token),
('how', 'inline_form_home_page'),
('user[email]', user_email),
('user[password]', user_pass),
('commit', 'Sign in'),
('user[remember_me]', '0'),
]
r = self.session.post('https://www.datacamp.com/users/sign_in', data=data)
if r.status_code == 200:
return True
else:
return False
def exercise_data(self, chapter_url):
r = self.session.get(chapter_url)
return r.content
def chapter_extractor(self, course_url):
def add_data(exer, ex_data, index):
exer['data'] = ex_data[index]
return exer
def exercise_class(exercise_li):
if 'interactive' in exercise_li.xpath('.//img/@alt')[0]:
exercise_dic = {}
exercise_dic['url'] = exercise_li.xpath('.//a/@href')[0]
exercise_dic['title'] = exercise_li.xpath('.//h5[@class="chapter__exercise-title"]/@title')[0]
return exercise_dic
if os.path.isfile('courses/courses_data/'+course_url.split('/')[-1]+'.json'):
chapter_arr = json.loads(open('courses/courses_data/'+course_url.split('/')[-1]+'.json').read())['chapters']
else:
r = self.session.get(course_url)
tree = html.fromstring(r.content)
chapters = tree.xpath('//ol[@class="chapters chapters--single-column"]/li[@class="chapter"]')
course_id = re.search(r'tion/course_(.*?)/shields/', r.text).group(1)
exercise_ids = tree.xpath('//span[@class="js-mobile-progress-container js-mobile-chapter-progress"]/@data-id')
datasets_url = tree.xpath('//ul[@class="course__datasets"]/li/a/@href')
datasets_name = [x.strip() for x in tree.xpath('//ul[@class="course__datasets"]/li/a/text()')]
datasets = dict(zip(datasets_name, datasets_url))
chapter_arr = []
for index, chapter in enumerate(chapters):
chapter_dic ={}
chap_exe = self.session.get('https://campus-api.datacamp.com/api/courses/'+course_id+'/chapters/'+exercise_ids[index]+'/progress')
cleaned_chap_exe = [x for x in chap_exe.json() if x['last_attempt'] == None or '#' in x['last_attempt']]
chapter_dic['name'] = chapter.xpath('.//h4[@class="chapter__title"]/text()')[0].strip()
chapter_dic['number'] = chapter.xpath('.//span[@class="chapter-number"]/text()')[0].strip()
chapter_dic['description'] = chapter.xpath('.//p[@class="chapter__description"]/text()')[0].strip()
chapter_dic['exercises'] = [exercise_class(x) for x in chapter.xpath('.//ul[@class="chapter__exercises hidden"]/li') if exercise_class(x) != None]
chapter_dic['exercises'] = [add_data(x, cleaned_chap_exe, idx) for idx, x in enumerate(chapter_dic['exercises'])]
chapter_arr.append(chapter_dic)
with open('courses/courses_data/'+course_url.split('/')[-1]+'.json', 'w') as out:
json.dump({'chapters':chapter_arr, 'datasets': datasets}, out, indent=4)
return chapter_arr
def exercise_statement(self, exercise_url):
CLEAN_RE = re.compile(r'<[^>]+>')
def clean_txt(text):
return CLEAN_RE.sub('', text)
r = self.session.get(exercise_url)
tree = html.fromstring(r.content)
title = tree.xpath('//div[@class="exercise--assignment exercise--typography"]')[0].xpath('.//h1/text()')[0]
statement = clean_txt(etree.tostring(tree.xpath('//div[@class="exercise--assignment exercise--typography"]')[0].xpath('.//p')[0]).decode("utf-8").strip())
try:
instructions = [clean_txt(etree.tostring(x).decode("utf-8").strip()) for x in tree.xpath('//div[@class="exercise--instructions exercise--typography"]')[0].xpath('.//ul/li')]
except:
instructions = [clean_txt(etree.tostring(x).decode("utf-8").strip()) for x in tree.xpath('//div[@class="exercise--instructions"]/div[@class="exercise--typography"]')[0].xpath('.//ul/li')]
return title, statement, instructions
def create_source(self, course_url, chapter_number, chapter_name, exercise_number, exercise_name, data, exercise_url, sub=False):
course_name = course_url.split('/')[-1]
chapter_directory = 'courses/'+course_name+'/chapters/'+str(chapter_number)+'_'+chapter_name.replace('/', '_')
ex_title, ex_statement, ex_instructions = self.exercise_statement(exercise_url)
ex_template = "#{}\n\n#STATEMENT\n'''\n{}\n'''\n\n#INSTRUCTIONS\n'''\n{}\n'''\n\n#EXERCISE SOURCE CODE\n{}"
if not os.path.exists('courses/'+course_name):
os.makedirs('courses/'+course_name)
if not os.path.exists(chapter_directory):
os.makedirs(chapter_directory)
if sub:
aux = ''
for index, item in enumerate(data):
if 'selected_option' in item['last_attempt']:
to_write = '#'+item['last_attempt']
else:
to_write = item['last_attempt']
aux += '\n'+'\n'+'#'+exercise_name+' subexercise '+str(index)+'\n'+'\n'+ to_write
data = aux
with open(chapter_directory+'/'+str(exercise_number)+'_'+exercise_name.replace('/','_')+'.py', 'w') as f:
f.write(ex_template.format(ex_title.upper(), ex_statement.replace('.', '.\n'), '\n'.join(ex_instructions), data))
def download_course_source(self, course_url):
data = self.chapter_extractor(course_url)
for item in data:
for idx, ex in enumerate(item['exercises']):
if len(ex['data']['subexercises']) == 0:
self.create_source(course_url, item['number'], item['name'], idx, ex['title'], ex['data']['last_attempt'], ex['url'], sub=False)
else:
self.create_source(course_url, item['number'], item['name'], idx, ex['title'], ex['data']['subexercises'], ex['url'], sub=True)