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Develop a web crawler in Python

We are academics at Imperial College London and New York University conducting research on startup companies and their legal policies on the web.

The task is to write a web crawler in Python 3 that gets historical information about company websites from the Wayback machine ([login to view URL]).

We will also need a [login to view URL] file that shows any Python dependencies, and a Jupyter demo notebook that runs the crawler on a sample of inputs.

There will be more work available for a freelancer who completes this task to a high standard.

*** DESCRIPTION OF DESIRED CODE ***

The crawler should have two high-level functions.

FUNCTION 1: find_snapshots

Please use one of the Wayback APIs for this function if possible ([login to view URL]).

Input:

A website (e.g., [login to view URL])

A list of two dates in YYYYMMDD format (e.g., [20150202, 20150802])

Output:

A dictionary of links to all snapshots available on wayback between the given dates (return empty dictionary if no snapshots available).

Example output:

out_dict = {'20150202' : '[login to view URL]://[login to view URL]'}

FUNCTION 2: get_snapshot_info

Input:

A link to a snapshot (e.g., a value of the dictionary returned by find_snapshots)

A keyword (e.g., 'privacy')

Output:

A dictionary with information about the snapshot, obtained as follows

a) Visit snapshot link. Download homepage HTML code (discard garbage such as 404 errors). It is particularly important that this step deals with redirects that sometimes happen on wayback (HTML 302 returns and pop-ups are common) and does not return garbage in those cases.

b) Extract all hyperlinks from the homepage HTML (use of BeautifulSoup preferred). Find all hyperlinks containing the keyword EITHER in their text OR in the URL. Example of such a hyperlink: [login to view URL]://[login to view URL]

c) Visit all hyperlinks containing the keyword and download their HTML code (discard garbage such as 404 errors)

Example output:

out_dict = { ‘homepage_download’ : True, # boolean flag for whether download in step a) is successful

‘homepage_html’ : string # string containing HTML code of homepage downloaded in step a)

‘keyword_links’ : [‘xxx','yyy','zzz'], # list of links found to contain keyword in step b) (return empty list if none found)

‘keyword_download' : [True, False, True], # list of boolean flags for whether downloads in step c) is successful

'keyword_html' : [string, string, string]} # list of strings containing HTML code of keyword pages downloaded in step c)

*** EVALUATION AND PROJECT COMPLETION ***

DEFINITION OF SUCCESS:

For a given set of inputs (website, dates, keyword), we define success in two stages:

The crawler is successful in stage 1 if homepage_download = True for at least one snapshot found in the given date range (and if the HTML is not garbage)

The crawler is successful in stage 2 if keyword_download = True for at least one subpage of a snapshot (and if the HTML is not garbage)

EVALUATION OF FREELANCER OUTPUT:

We will give you a list of 500 inputs (website, dates, keyword) for development. We will test your results on a list of 500 different inputs.

Human trials have the following success rates with keyword = 'privacy':

- Stage 1 success: 60% if the website is a startup company in the given date range, and 90% if it is a mature company.

- Stage 2 success: 50% if the website is a startup company in the given date range, and 80% if it is a mature company.

For completion of the project, you must achieve the following

- success rates are reasonably close to human trials

- source code is clean and well documented

- Jupyter demo notebook is clean and well documented

- [login to view URL] allows code to be run without errors

Kĩ năng: Python, Web Scraping, Kiến trúc phần mềm, PHP, Khai thác dữ liệu

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Về Bên Thuê:
( 2 nhận xét ) London, United Kingdom

ID dự án: #20270382

Được trao cho:

seaanddream

Hi, my name is Selim. I am from Solihull, UK. I read your `Develop a web crawler in Python` project descriptions carefully before bidding. I checked the target url, and your requirements as well... I got what you need Thêm

£750 GBP trong 10 ngày
(287 Đánh Giá)
7.9

57 freelancer đang chào giá trung bình £521 cho công việc này

omsoftware

Hello, Yes, we are well experienced in data scrapping and we can definitely do this as per your requirements. I'm interested in working with you. As per your interest, I can talk for a better deal. Waiting for your Thêm

£750 GBP trong 25 ngày
(142 Nhận xét)
9.0
helmot

Hello. I have worked wayback before and can show you a demo and codes if you are interested. Its in Python 2.7 but its not hard to switch to Python 3. Thanks, Helmot

£500 GBP trong 7 ngày
(224 Nhận xét)
8.2
zhangyingtai

Hello sir Thanks for your detailed job description. I have got full understanding from the job description and am very clear about the task. I have 9 years of experience about web scraping and am suitable for th Thêm

£555 GBP trong 5 ngày
(118 Nhận xét)
7.5
pavellint

Greeting to fellow academics! It would be an honour to do some work for the sake of science :) I've done a lot of similar things before, once even some code for MIT. Cheers, Pavel.

£750 GBP trong 9 ngày
(48 Nhận xét)
7.0
zeke

I wrote many web crawlers. This is my favorite type of job. I am absolutely confident I can finish this project to your satisfaction and on time. Available to start immediately and finish as soon as possible. Looking f Thêm

£500 GBP trong 7 ngày
(195 Nhận xét)
7.5
C3guru

Hello. I am a talented Web scraping solution developer. Especially, I've mastered selenium and scrapy with python. You can see my profile that finished a lot of scraping jobs. I've just reviewed your requirements and Thêm

£500 GBP trong 7 ngày
(44 Nhận xét)
6.7
etuannv

Hi there, I am interested in your project. I would approach your project by using Python3 I have 4+ years’ experience at Web scraping. If you'd like to view my previous work, take a look at my profile [login to view URL] Thêm

£700 GBP trong 7 ngày
(82 Nhận xét)
6.5
mananraja

hey, I have read what you need and checked the website you mentioned. I can make a PYTHON scraper script to get this done. I will also fulfill your 4 requirements that you listed at the end of your description. I have Thêm

£250 GBP trong 2 ngày
(163 Nhận xét)
6.4
alexwmsoft

100% Completion Rate and 5 Stars Dear, employer. My name is Lee, I am an experienced web developer, and web scraping expert. I have good experiences in web scraping using PHP, Python, Java and so on. I read your job Thêm

£500 GBP trong 7 ngày
(36 Nhận xét)
6.3
farooq4161

Greetings, I am an experienced professional scrapper and have done similar projects in the past. Same can be verified from my profile. Let me allow to assist you with your requirements. Thanks

£750 GBP trong 8 ngày
(65 Nhận xét)
6.2
stead121

Hello, Glad to meet you I have strong experience and skill in web crawling as you could see in my recent reviews. If you want to see my skill, please check these videos. [login to view URL] ht Thêm

£300 GBP trong 7 ngày
(59 Nhận xét)
6.1
MyAwesomeTeam

Dear Sir/Madam, I checked requirement and i think what you need is : + the task is to write a web crawler in python 3 that gets historical information about company websites from the wayback machine (web.archive. Thêm

£523 GBP trong 3 ngày
(49 Nhận xét)
6.0
HongCStar86

Hello I read your job post and very interested in your job I am a full stack developer have 7+years experience with Python Kindly review my profile I can start immediately and comfortable with your timezone Thanks H Thêm

£500 GBP trong 7 ngày
(32 Nhận xét)
5.9
honeyocs803

Dear. Nice to meet you. While reading your job description, I understood your main goal. I am a Python Expert and FULL-Time Developer. I have been programming for over 8+ years & always had a 100% satisfaction rate. Thêm

£500 GBP trong 7 ngày
(20 Nhận xét)
5.5
esolzpk

HI I have gone through the requirements in detail and i have few questions is I am specialize in website design and development and are excited for the opportunity to work with you in accomplishing your goals. We h Thêm

£555 GBP trong 6 ngày
(16 Nhận xét)
5.4
smsaurabhv

‌Hi, I have gone through your requirement to scrape lots of websites. I am EXPERT in building scraping tools /scripts. Hence, I can SURELY work on your project. I am having 4 YEARS of EXPERIENCE in developing PHP-PYTHO Thêm

£250 GBP trong 3 ngày
(60 Nhận xét)
5.2
vicksan

Hello, Greetings for the day! As you are looking for a Python expert then I am here to work on the project. Thanks for the job opportunity. And it will be a pleasure for me to work with you. Can you please share more Thêm

£1000 GBP trong 40 ngày
(13 Nhận xét)
5.2
kunitsynartem

Hello! I'm interested in making your project for historical snapshots parsing using Python. I'm ready to make a script that will do both stages of work described in your project. Just please, provide me with sample inp Thêm

£500 GBP trong 7 ngày
(30 Nhận xét)
5.3
BorisMonday2018

Hello, How are you? I hope you are fine. I have saw your descriptions what you want. I would like to work for your project if you want. I have over 5 years of experiences on the Web Crawling. I am ready to start the w Thêm

£700 GBP trong 10 ngày
(52 Nhận xét)
6.0
divumanocha

Hi, Warm Greetings.!!! I have been really very happy to see a job posting which is 100% fit for my skills. According to the job description, you need a Python developer to assist you in your project. -I am glad to Thêm

£500 GBP trong 7 ngày
(27 Nhận xét)
5.7