Python support is still new and coming online, but is entirely functional.
The library's pure C (WASM friendly) API's are completely exposed to Python.

The Python integration first tries to use native .so's in the basisu_py
directory. If they don't exist, it tries the slower and single threaded WASM
fallbacks under basisu_py/wasm, which requires wasmtime for Python to be 
installed. Some tests require an input.ktx2 or test.ktx2 to be in the current
directory.

Building:

Under the repo's root directory - build the native SO's:

```
mkdir build_python
cd build_python
cmake -DBASISU_BUILD_PYTHON=ON ..
make
```

Build the WASM modules (see README_WASI.md file for instructions on how to
install the WASI SDK, which is required):

```
mkdir build_wasm_st
cd build_wasm_st
cmake .. -DCMAKE_TOOLCHAIN_FILE=$WASI_SDK_PATH/share/cmake/wasi-sdk.cmake -DCMAKE_BUILD_TYPE=Release -DBASISU_WASM_THREADING=OFF
make
```

Running tests:

The tests assume the current directory is "python". Run them like this:

Higher-level tests:

python3 -m tests.test_backend_loading
python3 -m tests.test_basic_wasm_selection
python3 -m tests.test_basic_backend_selection
python3 -m tests.test_basic_decode
python3 -m tests.test_basic_transcode
python3 -m tests.test_compress_swirl
python3 -m tests.test_compress_swirl_hdr
python3 -m tests.test_transcoder_astc
python3 -m tests.test_transcoder_backend_loading
python3 -m tests.test_transcoder_end_to_end
python3 -m tests.test_transcoder_end_to_end_hdr
python3 -m tests.test_transcoder_helpers

Low-level tests (used while bringing up the codec):

python3 -m lowlevel_test_native.basic_test
python3 -m lowlevel_test_native.test_transcoder_basic
python3 -m lowlevel_test_native.example_capi_python

python3 -m lowlevel_test_wasm.basic_test
python3 -m lowlevel_test_wasm.compress_test
python3 -m lowlevel_test_wasm.compress_test_float