urltitle

urltitle uses Python 3.7 to return the page title or header-based description for a given URL. Its intended primary use is the inclusion of the returned value in conversations. As a disclaimer, note that the returned title is not guaranteed to be accurate due to many possible factors.

Features

An in-memory cache is used with a default entry expiration of a week. The cache size and time are customizable.
Approximately only the fraction of a HTML page required to return a title is read, up to a customizable maximum of 1 MiB.
A fallback to the og:title and twitter:title if the title tag is unavailable.
A PDF title metadata extractor is used for PDF files of up to a customizable maximum size of 8 MiB.
Up to three attempts are made for resiliency except if there is an unrecoverable error, i.e. 400, 401, 404, etc.
A guess of https and otherwise http is made for a URL with a missing scheme, e.g. git-scm.com/downloads.
SSL verification for https sites can optionally be disabled.
A fallback to Google web cache is used if a HTML page presents a Distil captcha. It is also used for a PDF which is too large or doesn't have title metadata.
Diagnostic logging can be optionally enabled for the logger named urltitle at the desired level.
Some site-specific customizations are configurable:
- Regular expression based URL and title substitutions
- Use of Google web cache
- User-Agent
- Additional headers
- CSS title selector
- Use of og:title or twitter:title over title tag
- Initial read size

Usage

Installation

Python ≥3.7 is required due to a reference to SSLCertVerificationError.

To install the package, run:

pip install urltitle

Examples

from urltitle import URLTitleReader

reader = URLTitleReader(verify_ssl=True)

# Titles for HTML content
reader.title('https://www.cnn.com/2019/02/11/health/insect-decline-study-intl/index.html')
"Insect numbers in precipitous decline could have 'catastrophic' consequences, warns study - CNN"

reader.title('https://www.youtube.com/watch?v=53YvP6gdD7U')
'Deep Learning State of the Art (2019) - MIT - YouTube'

# Titles for URLs with a missing scheme
reader.title('www.reuters.com/article/us-usa-military-army/army-calls-base-housing-hazards-unconscionable-details-steps-to-protect-families-idUSKCN1Q4275')
"Army calls base housing hazards 'unconscionable,' details steps to protect families | Reuters"

reader.title('reddit.com/r/FoodNerds/comments/arb6qj')
'Paternal high-fat diet transgenerationally impacts hepatic immunometabolism. - PubMed - NCBI : FoodNerds'

reader.title('neverssl.com')
'NeverSSL - helping you get online'

# Titles for non-ASCII URLs
reader.title('https://en.wikipedia.org/wiki/Amanattō')
'Amanattō - Wikipedia'

reader.title('https://fr.wikipedia.org/wiki/Wikipédia:Accueil_principal')
"Wikipédia, l'encyclopédie libre"

# Titles for PDFs having title metadata
reader.title('https://www.diabetes.org.br/publico/images/pdf/artificial-sweeteners-induce-glucose-intolerance-by-altering-the-gut-microbiota.pdf')
'Artificial sweeteners induce glucose intolerance by altering the gut microbiota'

reader.title('https://www.omicsonline.org/open-access/detection-of-glyphosate-in-malformed-piglets-2161-0525.1000230.pdf')
'Detection of Glyphosate in Malformed Piglets'

# Titles for other content showing Content-Type and Content-Length as available:
reader.title('https://www.sciencedaily.com/images/2019/02/190213142720_1_540x360.jpg')
'(image/jpeg) (54K)'

reader.title('https://kdnuggets.com/rss')
'(application/rss+xml; charset=UTF-8)'

reader.title('https://download.fedoraproject.org/pub/fedora/linux/releases/29/Workstation/x86_64/iso/Fedora-Workstation-Live-x86_64-29-1.2.iso')
'(application/octet-stream) (2G)'

# Titles for substituted URLs as per configuration:
reader.title('https://arxiv.org/pdf/1902.04704.pdf')
'[1902.04704] Neural network models and deep learning - a primer for biologists'

reader.title('https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2495396/pdf/postmedj00315-0056.pdf')
"Features of a successful therapeutic fast of 382 days' duration"

reader.title('https://pdfs.semanticscholar.org/1d76/d4561b594b5c5b5250edb43122d85db07262.pdf')
'Nutrition and health. The issue is not food, nor nutrients, so much as processing. - Semantic Scholar'

Exceptions

An error is expected to raise the urltitle.URLTitleError exception.

Customizations

For any site-specific customizations, update (but ideally not replace) urltitle.config.NETLOC_OVERRIDES with the relevant sites using the preexisting entries in it as examples. Refer to overrides.py. The site of a URL is as defined and returned by the URLTitleReader().netloc(url) method in urltitle.py.

The following examples show various URLs and their corresponding sites for the purpose of entering site-specific customizations:

URL	Site
`https://www.google.com/search?q=asdf`	`google.com`
`https://google.com/search?q=hjkl`	`google.com`
`google.com/search?q=qwer`	`google.com`
`google.com`	`google.com`
`GOOGLE.COM`	`google.com`
`gOogLE.com`	`google.com`
`https://drive.google.com/drive/my-drive`	`drive.google.com`
`https://help.github.com/en/`	`help.github.com`
`https://github.com/pytorch/pytorch`	`github.com`
`https://www.amazon.com/gp/product/B01F8POA7U`	`amazon.com`
`https://rise.cs.berkeley.edu/blog/`	`rise.cs.berkeley.edu`
`https://www.swansonvitamins.com/web-specials`	`swansonvitamins.com`

impredicative / urltitle