All frozen libraries have been updated to their latest versions as of 2018-11-01.
The default value of sys.path has been changed. OLD:
['', '/', '/lib', '.frozen']
['', '/', '.frozen', '/lib']
This change causes the frozen library of a library to be found and loaded on import, instead of any non-frozen version in /lib. Previously, to make sure the frozen version of a library was used, you had to remove that library from /lib. Whenever you updated /lib with a new library bundle, this had to be repeated.
When frozen libraries are imported they use up much less heap space (in RAM) than compiled .mpylibraries in /lib or elsewhere. This helps prevent running out of RAM when importing several modules or allocating large amounts of storage. This was a common support issue. Thanks to @kattni for advocating for this change, to @caternuson for discussion, and to @dhalbert for implementation.
If you need to override a frozen library with a different version, simply place it in /, instead of in /lib. The version in / will be found first and will be used instead.
Note that .frozen is not a real directory. It represents all the frozen modules. You cannot list it with os.listdir().
The following builds include frozen libraries and are affected by this change: circuit_playground_express, circuit_playground_express_crickit, feather_m0_express_crickit, hallowing_m0_express, pirkey_m0.
Note: Release 3.1.0 is being skipped: the tag was created on the wrong commit. The tag has been deleted, but we’re skipping it to avoid confusion.
Pre-built mpy-cross executables are available above for MacOS, Windows, Ubuntu, and Raspbian. For MacOS, Ubuntu, and Raspbian, you must make the mpy-cross download executable by doing. Then you can compile a .py file to .mpy:
$ chmod +x mpy-cross-whatever-you-downloaded # you only need to do this once
$ ./mpy-cross-whatever-you-downloaded yourfile.py # this will generate yourfile.mpy
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.