piculet 1.0b2

Piculet is a module and a utility for extracting data from XML documents using XPath queries. It can also scrape web pages by first converting the HTML source into XHTML. Piculet consists of a single source file with no dependencies other than the standard library, which makes it very easy to integrate into applications.

PyPI:	https://pypi.python.org/pypi/piculet/
Repository:	https://bitbucket.org/uyar/piculet
Documentation:	https://piculet.readthedocs.io/

Piculet has been tested with Python 2.7, Python 3.3+, PyPy2 5.7, and PyPy3 5.7. You can install the latest version from PyPI:

pip install piculet

Installing Piculet creates a script named piculet which can be used to invoke the command-line interface:

$ piculet -h
usage: piculet [-h] [--debug] command ...

The scrape command extracts data out of a document as described by a specification file:

$ piculet scrape -h
usage: piculet scrape [-h] -s SPEC [--html] document

The location of the document can be given as a file path or a URL. The specification file is in JSON format and contains the rules that define how to extract the data. For example, say you want to extract some data from the file shining.html. An example specification file is given in movie.json. Download both these files and run the command:

piculet scrape -s movie.json shining.html

This should print the following output:

{
  "cast": [
    {
      "character": "Jack Torrance",
      "link": "/people/2",
      "name": "Jack Nicholson"
    },
    {
      "character": "Wendy Torrance",
      "link": "/people/3",
      "name": "Shelley Duvall"
    }
  ],
  "director": {
    "link": "/people/1",
    "name": "Stanley Kubrick"
  },
  "genres": [
    "Horror",
    "Drama"
  ],
  "language": "English",
  "review": "Fantastic movie. Definitely recommended.",
  "runtime": "144 minutes",
  "title": "The Shining",
  "year": "1980"
}

If the document is in HTML format but it is not well-formed XML, the --html option has to be used. If the document address starts with http:// or https://, the given URL is downloaded and the rules are applied to the content. For example, to extract some data from the Wikipedia page for David Bowie, download the wikipedia.json file and run the command:

piculet scrape -s wikipedia.json --html "https://en.wikipedia.org/wiki/David_Bowie"

This should print the following output:

{
  "birthplace": "Brixton, London, England",
  "born": "1947-01-08",
  "died": "2016-01-10",
  "name": "David Bowie",
  "occupation": [
    "Singer",
    "songwriter",
    "actor"
  ]
}

In the same command, change the name part of the URL to Merlene_Ottey and you will get similar data for Merlene Ottey. Note that since the markup used in Wikipedia pages for persons varies, the kinds of data you get with this specification file will also vary.

Piculet can be used as an HTML to XHTML convertor by invoking it with the h2x command. This command takes the file name as input and prints the converted content, as in piculet h2x foo.html. If the input file name is given as - it will read the content from the standard input and therefore can be used as part of a pipe: cat foo.html | piculet h2x -

History

1.0b2 (2017-06-16)

• Added helper function for getting cache hash keys of URLs.

1.0b1 (2017-04-26)

• Added optional value transformations.
• Added support for custom reducer callables.
• Added command-line option for scraping documents from local files.

1.0a2 (2017-04-04)

• Added support for Python 2.7.
• Fixed lxml support.

1.0a1 (2016-08-24)

• First release on PyPI.