Use as_py_json in place of deprecated as_object_map for Pyodide>=0.29

[agriyakhetarpal]

We deprecated this method with Pyodide v0.29, and it will be removed in Pyodide v0.31. See pyodide/pyodide#5010, which adds a replacement that should work out of the box as it supports the IS_PY_JSON_DICT flag.

I tested this on the Pyodide dev and stable consoles with a few packages installed; it works well. I'll open a separate issue to discuss whether we want to smoke test Pyodide in-tree here.

cc: @lesteve
xref: scikit-image/scikit-image#7931

[agriyakhetarpal]

The failing tests are unrelated here. Here is a very simple code snippet that I used on the Pyodide console to verify that the library lookup is working (please install a few compiled packages, say, numpy and so on, so that there is something to look up in the first place):

from pyodide_js._module import LDSO
import os

found_libs = []
all_keys = []

for filepath in LDSO.loadedLibsByName.as_py_json():
    all_keys.append(filepath)
    if os.path.exists(filepath):
        found_libs.append(filepath)

print(f"Total library keys: {len(all_keys)}")
print(f"Libraries that exist on the file system: {len(found_libs)}")

if found_libs:
    print("\n Here are the first ten real library files:")
    for lib in found_libs[:10]:
        print(f"  {lib}")
else:
    print("\nNo libraries found on filesystem")
    print("Sample keys from LDSO.loadedLibsByName:")
    for key in all_keys[:10]:
        print(f"  {key}")

which gives me the following output:

Total library keys: 20
Libraries that exist on the file system: 19
... 
 Here are the first ten real library files:
  /lib/python3.13/site-packages/numpy/_core/_multiarray_umath.cpython-313-wasm32-emscripten.so
  /lib/python3.13/site-packages/numpy/fft/_pocketfft_umath.cpython-313-wasm32-emscripten.so
  /lib/python3.13/site-packages/numpy/linalg/_umath_linalg.cpython-313-wasm32-emscripten.so
  /lib/python3.13/site-packages/numpy/linalg/lapack_lite.cpython-313-wasm32-emscripten.so
  /lib/python3.13/site-packages/numpy/random/_bounded_integers.cpython-313-wasm32-emscripten.so
  /lib/python3.13/site-packages/numpy/random/_common.cpython-313-wasm32-emscripten.so
  /lib/python3.13/site-packages/numpy/random/_generator.cpython-313-wasm32-emscripten.so
  /lib/python3.13/site-packages/numpy/random/_mt19937.cpython-313-wasm32-emscripten.so
  /lib/python3.13/site-packages/numpy/random/_pcg64.cpython-313-wasm32-emscripten.so
  /lib/python3.13/site-packages/numpy/random/_philox.cpython-313-wasm32-emscripten.so

[lesteve]

I double-checked in a Pyodide console that as_py_json was working fine.

Since as_py_json was added in Pyodide 0.29, I would add something based on getattr or try/except to make sure that it works with Pyodide < 0.29.

The CI errors don't seem related.

[agriyakhetarpal]

On it!

[lesteve]

LGTM, thanks!