Metadata-Version: 2.1
Name: le-utils
Version: 0.1.37
Summary: LE-Utils contains shared constants used in Kolibri, Ricecooker, and Kolibri Studio.
Home-page: https://github.com/learningequality/le-utils
Author: Learning Equality
Author-email: info@learningequality.org
License: MIT
Download-URL: https://github.com/learningequality/le-utils/releases
Description: LE Utils
        ========
        The `le-utils` package contains shared constants used by Ricecooker, Kolibri, and
        Kolibri Studio. This package is not meant to be installed or used directly, but
        plays an important role in all Learning Equality products.
        
        
        Constants
        =========
        The Python files in the [le_utils/constants/](./le_utils/constants) are used to
        define constants (usually in `ALL_CAPS` form) to be used from Python code.
        The same constants and naming conventions are also provided in JSON format in the
        folder [le_utils/resources/](le_utils/resources) for use in frontend code.
        This means, adding a new constant may require editing multiple files: the Python
        constant-defining file, the JSON-file, and any associated tests.
        
        
        Languages
        ---------
        The file [le_utils/constants/languages.py](./le_utils/constants/languages.py) and
        the lookup table in [le_utils/resources/languagelookup.json](./le_utils/resources/languagelookup.json)
        define the internal representation for languages codes used by Ricecooker, Kolibri,
        and Kolibri Studio to identify educational content in different languages.
        
        The internal representation uses a mixture of two-letter codes (e.g. `en`),
        two-letter-and-country code (e.g. `pt-BR` for Brazilian Portuguese),
        and three-letter codes (e.g., `zul` for Zulu).
        
        In order to make sure you have the correct language code when interfacing with
        the Kolibri ecosystem (e.g. when uploading new content to Kolibri Studio), you
        must lookup the language object using the helper method `getlang`:
        
        ```
        >>> from le_utils.constants.languages import getlang
        >>> language_obj = getlang('en')       # lookup language using language code
        >>> language_obj
        Language(native_name='English', primary_code='en', subcode=None, name='English', ka_name=None)
        ```
        The function `getlang` will return `None` if the lookup fails. In such cases, you
        can try lookup by name or lookup by alpha2 code (ISO_639-1) methods defined below.
        
        Once you've successfully looked up the language object, you can obtain the internal
        representation language code from the language object's `code` attribute:
        ```
        >>> language_obj.code
        'en'
        ```
        The Ricecooker API expects these internal representation language codes will be
        supplied for all `language` attributes (channel language, node language, and files language).
        
        
        
        ### More lookup helper methods
        The helper method `getlang_by_name` allows you to lookup a language by name:
        ```
        >>> from le_utils.constants.languages import getlang_by_name
        >>> language_obj = getlang_by_name('English')  # lookup language by name
        >>> language_obj
        Language(native_name='English', primary_code='en', subcode=None, name='English', ka_name=None)
        ```
        
        The module `le_utils.constants.languages` defines two other language lookup methods:
          - Use `getlang_by_native_name` for lookup up names by native language name,
            e.g., you look for 'Français' to find French.
         -  Use `getlang_by_alpha2` to perform lookups using the standard two-letter codes
            defined in [ISO_639-1](https://en.wikipedia.org/wiki/ISO_639-1) that are
            supported by the `pycountries` library.
        
        
        #### Useful links
        
        The following websites are usful for researching language codes:
        
          - https://www.ethnologue.com/
          - https://en.wikipedia.org/wiki/List_of_ISO_639-2_codes
        
        
        
        Licenses
        --------
        All content nodes within Kolibri and Kolibri Studio must have a license. The file
        [le_utils/constants/licenses.py](./le_utils/constants/licenses.py) contains the
        constants used to identify the license types. These constants are meant to be
        used in conjunction with the helper method `ricecooker.classes.licenses.get_license`
        to create `Licence` objects.
        
        To initialize a license object, you must specify the license type and the
        `copyright_holder` (str) which identifies a person or an organization. For example:
        ```
        from ricecooker.classes.licenses import get_license
        from le_utils.constants import licenses
        license = get_license(licenses.CC_BY, copyright_holder="Khan Academy")
        ```
        
        Note: The `copyright_holder` field is required for all License types except for
        the public domain license for which `copyright_holder` can be None.
        
        
        
        
        Content kinds (ContentNode subclasses)
        --------------------------------------
        Content items throughout the Kolibri ecosystem come in several kinds. The `kind`
        attribute of each object can be one of ("topic", "video", "audio", "exercise"
        "document", or "html5".
        See [constants/content_kinds.py](https://github.com/learningequality/le-utils/blob/master/le_utils/constants/content_kinds.py#L11-L17) for latest list.
        
        The currently supported content kinds are:
          - Topic node (folder)
          - Video content nodes backed by a video files and subtitles
          - Audio content nodes backed by an audio files
          - Document content nodes backed by a document files (PDF or ePub)
          - HTML5 app content nodes backed by a HTML5 zip files
          - Slideshow content nodes
          - Exercise content nodes
        
        The `kind` attribute identifies a subclass of the base content node class within
        the data model, which differs on Ricecooker, Studio, and Kolibri:
          - [ricecooker.classes.nodes.ContentNode](https://github.com/learningequality/ricecooker/blob/master/ricecooker/classes/nodes.py#L428-L506):
            in-memory content node used to store metadata needed to upload new content to Kolibri  Studio
          - [contentcuration.contentcuration.models.ContentNode](https://github.com/learningequality/studio/blob/develop/contentcuration/contentcuration/models.py#L775):
            node within one of the trees associated with a Kolibri Studio channel.
          - [kolibri.core.content.models.ContentNode](https://github.com/learningequality/kolibri/blob/develop/kolibri/core/content/models.py#L175):
            node within tree for a particular version of a channel on Kolibri.
        
        For a detailed description of the common and different model attributes available
        on content nodes in each part of the platform see [this doc](https://docs.google.com/spreadsheets/d/181hSEwJ7yVmMh7LEwaHENqQetYSsbSDwybHTO_0zZM0/edit#gid=1640972430).
        
        
        
        File formats (extensions)
        -------------------------
        These are low-level constant that represents what type of file and are essentially
        synonymous with file extensions. The file format `MP4` is simply a convenient
        proxy for the file extension `mp4`.
        See [file_formats.py](https://github.com/learningequality/le-utils/blob/master/le_utils/constants/file_formats.py)
        and [resourcces/formatlookup.json](https://github.com/nucleogenesis/le-utils/blob/master/le_utils/resources/formatlookup.json).
        
        
        
        Format presets (ContentNode-File relation)
        ------------------------------------------
        Every `ContentNode` is associated with one or more `File` objects and nature of
        this association is represented though the `format_preset` attribute of the file.
        The `format_preset` is the role the file is playing in the content node,
        e.g., thumbnail, high resolution video, or low resolution video.
        Note that format presets are represented redundantly as python string in
        [constants/format_presets.py](https://github.com/learningequality/le-utils/blob/master/le_utils/constants/format_presets.py)
        and as json [resources/presetlookup.json](https://github.com/learningequality/le-utils/blob/master/le_utils/resources/presetlookup.json).
        
        You can think of the different format presets on a content node as different "slots"
        to be filled in by files, with certain slots being required while other optional.
        For examples, for a VideoNode (kind=`video`) to be a valid content node, it must
        have at least one video file associated with it filling either the `high_res_video`
        slot or the `low_res_video` slot. Certain slots can have multiple files in them,
        like the `video_subtitle` preset, since a VideoNode can have multiple subtitles
        associated with it for different languages.
        
        
        The figure below illustrates the structure between content nodes, files, and format presets.
        
        ![Illustration of the relationships between content kinds (nodes), files, and format presets.](docs/img/le-utils_constants_and_mapping.png)
        
        In the Sample shown, the Video Node is of content kind `video` and has three
        files associated with it:
          - The first file has file format `mp4` and format preset `high_res_video`
          - The second file is also in `mp4` format but the relation to the content node
            is that `low_res_video`
          - A third file with format `vtt` is associated with the content node with a
            format preset of `video_subtitle`.
        
        Format presets play a crucial role throughout the Kolibri content ecosystem and
        govern such things as content validation rules applied by Ricecooker, Kolibri Studio
        edit rules, and the rendering logic on Kolibri.
        
        
        File types (ricecooker.files.File subclasses)
        ---------------------------------------------
        Used on Ricecooker as identifiers to represents what type of file when serializing
        things to JSON as part of the content import process. Note that file types constants
        are internal to ricecooker operations and are not used in Kolibri Studio or Kolibri.
        
        
        
        Exercises
        ---------
        The file [le_utils/constants/exercises.py](./le_utils/constants/exercises.py)
        contains identifiers for different question types and mastery models.
        
        
        
        Proquint Channel Tokens
        -----------------------
        The file [le_utils/proquint.py](./le_utils/proquint.py) contains helper methods
        for generating proquint identifiers for content channels. These are short strings
        that are easy to enter on devices without a full keyboard, e.g. `sutul-hakuh`.
        
        
        Roles
        -----
        The `role` constants are used for Role-based access control (RBAC) within the
        Kolibri platform. Currently, only two levels of visibility are supported:
          - `learner` (default): content nodes are visible to all Kolibri users
          - `coach`: content nodes are only visible to Kolibri coaches and administrators
        
        
        Metadata labels
        ---------------
        
        These are encoded in spec/labels-v*.json. Once a spec has been finalized it will be
        added to finalized_specs.yml to ensure that CI will fail any future modifications
        to this specification. This ensures that the resulting built code has consistent
        ordering so that generated bits for bitmasks are stable across releases.
        We also require that all names in the specs be globally unique to minimize confusion
        and reduce the chance of collisions in translations of these terms for users.
        
Keywords: le-utils le_utils LE utils kolibri studio ricecooker content curation
Platform: UNKNOWN
Classifier: Development Status :: 2 - Pre-Alpha
Classifier: Programming Language :: Python
Classifier: License :: OSI Approved :: MIT License
Classifier: Topic :: Utilities
Description-Content-Type: text/markdown
Provides-Extra: lang_utils
