data-extractor 0.10.2

Combine XPath, CSS Selectors and JSONPath for Web data extracting.

Combine XPath, CSS Selectors and JSONPath for Web data extracting.

Quickstarts

Installation

Install the stable version from PYPI.

pip install "data-extractor[jsonpath-extractor]"  # for extracting JSON data
pip install "data-extractor[lxml]"  # for extracting HTML data

Or install the latest version from Github.

pip install "data-extractor[jsonpath-extractor] @ git+https://github.com/linw1995/data_extractor.git@master"

Extract JSON data

Currently supports to extract JSON data with below optional dependencies

• jsonpath-extractor

• jsonpath-rw

• jsonpath-rw-ext

install one dependency of them to extract JSON data.

Extract HTML(XML) data

Currently supports to extract HTML(XML) data with below optional dependencies

• lxml for using XPath

• cssselect for using CSS-Selectors

Usage

from data_extractor import Field, Item, JSONExtractor


class Count(Item):
    followings = Field(JSONExtractor("countFollowings"))
    fans = Field(JSONExtractor("countFans"))


class User(Item):
    name_ = Field(JSONExtractor("name"), name="name")
    age = Field(JSONExtractor("age"), default=17)
    count = Count()


assert User(JSONExtractor("data.users[*]"), is_many=True).extract(
    {
        "data": {
            "users": [
                {
                    "name": "john",
                    "age": 19,
                    "countFollowings": 14,
                    "countFans": 212,
                },
                {
                    "name": "jack",
                    "description": "",
                    "countFollowings": 54,
                    "countFans": 312,
                },
            ]
        }
    }
) == [
    {"name": "john", "age": 19, "count": {"followings": 14, "fans": 212}},
    {"name": "jack", "age": 17, "count": {"followings": 54, "fans": 312}},
]

Changelog

v0.10.2

Build

• upgrade jsonpath-extractor to v0.8.0

v0.10.1

Fix

• typo in .utils.Property

v0.10.0

Feature

• supports PEP 561 – Distributing and Packaging Type Information

Fix

• remove LICENSE file from dist files

• duplicated extracting if class attrs overlap happened #67

• remove super class sub-extractors error #68

Refactor

• remove duplciated module “data_extractor.abc”

• remove the lazy build mechanism of extractors

• JSON backend invoking mechanism

• make all properties of extractors immutable

Document

• fix wrong docstring of “data_extractor.utils.Property”

Contributing

Environment Setup

Clone the source codes from Github.

git clone https://github.com/linw1995/data_extractor.git
cd data_extractor

Setup the development environment. Please make sure you install the pdm, pre-commit and nox CLIs in your environment.

make init
make PYTHON=3.7 init  # for specific python version

Linting

Use pre-commit for installing linters to ensure a good code style.

make pre-commit

Run linters. Some linters run via CLI nox, so make sure you install it.

make check-all

Testing

Run quick tests.

make

Run quick tests with verbose.

make vtest

Run tests with coverage. Testing in multiple Python environments is powered by CLI nox.

make cov