How do I add more python modules to my yocto/openembedded project?

Question

I wish to add more python modules to my yocto/openembedded project but I am unsure how to? I wish to add flask and its dependencies.

Answer 1

some python packages having corresponding recipes in the meta folders, like Enum class for example:

meta-openembedded/meta-python/recipes-devtools/python/python-enum34_1.1.6.bb

unfortunately lot's of useful classes aren't available, but some might be needed for the python application. get used of installing missing packages using pip already on booted platform? but what if the target product is not IP network connected? the solution is to implement a new recipe and add to the platform meta layer (at least). Example is a recipe for the module keyboard useful for intercepting keys/buttons touch events:

1. use PyPi web site to identify if the package is available:

https://pypi.org/project/keyboard/

2. download archive available on the package description page:

https://github.com/boppreh/keyboard/archive/master.zip

3. collect some useful information required to fill-out a new recipe:

   • SUMMARY - could be obtained from the package description page
   • HOMEPAGE - the project URL on github or bitbucket or sourceforge, etc
   • LICENSE - verify license type
   • LIC_FILES_CHKSUM by executing md5sum on existing LICENSE or README or PKG-INFO file located in the root of the package (preferrably)
   • SRC_URI[md5sum] - is md5sum of the archive itself. it will be used to discover and download archive on pypi server automatically with the help of supporting script inherit pypi
   • PYPI_PACKAGE_EXT - if the package is not tar.gz require to supply the correct extension

4. create missing python-keyboard_0.13.1.bb recipe:

`

SUMMARY = "Hook and simulate keyboard events on Windows and Linux"
HOMEPAGE = "https://github.com/boppreh/keyboard"
LICENSE = "BSD-3-Clause"
LIC_FILES_CHKSUM = "file://PKG-INFO;md5=9bc8ba91101e2f378a65d36f675c88b7"

SRC_URI[md5sum] = "d4b90e53bbde888e7b7a5a95fe580a30"
SRC_URI += "file://add_missing_CHANGES_md.patch"

PYPI_PACKAGE = "keyboard"

PYPI_PACKAGE_EXT = "zip"

inherit pypi
inherit setuptools

BBCLASSEXTEND = "native nativesdk"

`

5. the package has been patched by adding

SRC_URI += "file://add_missing_CHANGES_md.patch"

directive to the recipe due to missing CHANGES.md file used by setup.py script to identify package version (this step is optional). the patch itself has to be placed inside the folder next to the recipe matching recipe name but without version:

python-keyboard