Python Library Core

Tools to ease creating larger test libraries for Robot Framework using Python. The Robot Framework hybrid and dynamic library API gives more flexibility for library than the static library API, but they also sets requirements for libraries which needs to be implemented in the library side. PythonLibCore eases the problem by providing simpler interface and handling all the requirements towards the Robot Framework library APIs.

Code is stable and is already used by SeleniumLibrary and Browser library. Project supports two latest version of Robot Framework.

Usage

There are two ways to use PythonLibCore, either by HybridCore or by using DynamicCore. HybridCore provides support for the hybrid library API and DynamicCore provides support for dynamic library API. Consult the Robot Framework User Guide, for choosing the correct API for library.

Regardless which library API is chosen, both have similar requirements.

1. Library must inherit either the HybridCore or DynamicCore.
2. Library keywords must be decorated with Robot Framework @keyword decorator.
3. Provide a list of class instances implementing keywords to library_components argument in the HybridCore or DynamicCore __init__.

It is also possible implement keywords in the library main class, by marking method with @keyword as keywords. It is not required pass main library instance in the library_components argument.

All keyword, also keywords implemented in the classes outside of the main library are available in the library instance as methods. This automatically publish library keywords in as methods in the Python public API.

The example in below demonstrates how the PythonLibCore can be used with a library.

Installation

To install this library, run the following command in your terminal:

pip install robotframework-pythonlibcore

This command installs the latest version of robotframework-pythonlibcore, ensuring you have all the current features and updates.

Example

"""Main library."""

from robotlibcore import DynamicCore

from mystuff import Library1, Library2


class MyLibrary(DynamicCore):
    """General library documentation."""

    def __init__(self):
        libraries = [Library1(), Library2()]
        DynamicCore.__init__(self, libraries)

    @keyword
    def keyword_in_main(self):
        pass

"""Library components."""

from robotlibcore import keyword


class Library1(object):

    @keyword
    def example(self):
        """Keyword documentation."""
        pass

    @keyword
    def another_example(self, arg1, arg2='default'):
        pass

    def not_keyword(self):
        pass


class Library2(object):

    @keyword('Custom name')
    def this_name_is_not_used(self):
        pass

    @keyword(tags=['tag', 'another'])
    def tags(self):
        pass

Plugin API

It is possible to create plugin API to a library by using PythonLibCore. This allows extending library with external Python classes. Plugins can be imported during library import time, example by defining argumet in library [__init__]{.title-ref} which allows defining the plugins. It is possible to define multiple plugins, by seperating plugins with with comma. Also it is possible to provide arguments to plugin by seperating arguments with semicolon.

from robot.api.deco import keyword  # noqa F401

from robotlibcore import DynamicCore, PluginParser

from mystuff import Library1, Library2


class PluginLib(DynamicCore):

    def __init__(self, plugins):
        plugin_parser = PluginParser()
        libraries = [Library1(), Library2()]
        parsed_plugins = plugin_parser.parse_plugins(plugins)
        libraries.extend(parsed_plugins)
        DynamicCore.__init__(self, libraries)

When plugin class can look like this:

class MyPlugi:

    @keyword
    def plugin_keyword(self):
        return 123

Then Library can be imported in Robot Framework side like this:

Library    ${CURDIR}/PluginLib.py    plugins=${CURDIR}/MyPlugin.py

Translation

PLC supports translation of keywords names and documentation. Translations must be provided in the translation argument in the HybridCore or DynamicCore __init__, either as a dictionary or through a Path to a JSON file. Providing translation data is optional, also it is not mandatory to provide translation to all keyword.

The keys of the dictionary are the methods names, not the keyword names, which implements keyword. Values are objects which contains two keys: name and doc. name key contains the keyword translated name and doc contains keyword translated documentation. Providing doc and name is optional, i.e. translations data can also provide translations only to keyword names or only to documentation. But it is always recommended to provide translation to both name and doc.

Library class documentation and instance documentation has special keys, __init__ key will replace instance documentation and __intro__ will replace library class documentation.

[!NOTE] Arguments names, tags and types can not be currently translated.

Example

If there is library like this:

from robotlibcore import DynamicCore, keyword

class SmallLibrary(DynamicCore):
    """Library documentation."""

    def __init__(self):
        """__init__ documentation."""
        DynamicCore.__init__(self, [])

    @keyword(tags=["tag1", "tag2"])
    def normal_keyword(self, arg: int, other: str) -> str:
        """I have doc

        Multiple lines.
        Other line.
        """
        data = f"{arg} {other}"
        print(data)
        return data

    def not_keyword(self, data: str) -> str:
        print(data)
        return data

    @keyword(name="This Is New Name", tags=["tag1", "tag2"])
    def name_changed(self, some: int, other: int) -> int:
        """This one too"""
        print(f"{some} {type(some)}, {other} {type(other)}")
        return some + other

And we want to translate it as follows:

• keyword normal_keyword to other_name
  • its documentation to This is new doc
• keyword name_changed to name_changed_again
  • its documentation to This is also replaced.\n\nnew line..
• the library constructor documentation to Replaces init docs with this one.
• the library documentation to New __intro__ documentation is here.

Provide Translation As File

To provide the translation as a file, simply pass the path to a JSON file containing the translations:

// my_translation.json
{
    "normal_keyword": {
        "name": "other_name",
        "doc": "This is new doc"
    },
    "name_changed": {
        "name": "name_changed_again",
        "doc": "This is also replaced.\n\nnew line."
    },
    "__init__": {
        "name": "__init__",
        "doc": "Replaces init docs with this one."
    },
    "__intro__": {
        "name": "__intro__",
        "doc": "New __intro__ documentation is here."
    }
}

from pathlib import Path

class SmallLibrary(DynamicCore):
    """Library documentation."""

    def __init__(self):
        """__init__ documentation."""
        DynamicCore.__init__(self, [], translation=Path("/path/to/my_translation.json"))

    # ...

[!IMPORTANT] Translation files passed as paths must always be in JSON format.

Provide Translation As Dictionary

You can also pass the translation data as a dictionary:

import json
from pathlib import Path

class SmallLibrary(DynamicCore):
    """Library documentation."""

    def __init__(self):
        """__init__ documentation."""
        translation_data = json.loads(Path("/path/to/my_translation.json").read_text(encoding="utf-8"))
        DynamicCore.__init__(self, [], translation=translation_data)

    # ...

This also allows you to use other data formats such as YAML:

normal_keyword:
  name: other_name
  doc: This is new doc
name_changed:
  name: name_changed_again
  doc: |
    This is also replaced.

    new line.
__init__:
  name: __init__
  doc: Replaces init docs with this one.
__intro__:
  name: __intro__
  doc: New __intro__ documentation is here.

import yaml
from pathlib import Path

class SmallLibrary(DynamicCore):
    """Library documentation."""

    def __init__(self, translation_file: Path):
        """__init__ documentation."""
        translation_data = yaml.safe_load(translation_file.read_text(encoding="utf-8"))
        DynamicCore.__init__(self, [], translation=translation_data)

    # ...