Allow deleting a Pagefind index in a context, update docs to match

docs/content/docs/py-api.md

@@ -234,17 +234,28 @@ for file in (await index.get_files()):
 
 ## index.write_files
 
-Closing the `PagefindIndex`'s context automatically calls `index.write_files`.
+Calling `index.write_files()` writes the index files to disk, as they would be written when running the standard Pagefind binary directly.
 
-If you aren't using `PagefindIndex` as a context manager, calling `index.write_files()` writes the index files to disk, as they would be written when running the standard Pagefind binary directly.
+Closing the `PagefindIndex`'s context automatically calls `index.write_files`, so calling this function is not necessary in normal operation.
+
+Calling this function won't prevent files being written when the context closes, which may cause duplicate files to be written.
+If calling this function manually, you probably want to also call `index.delete_index()`.
 
 ```py
-await index = PagefindIndex(
-    IndexConfig(
-        output_path="./public/pagefind",
-    ),
+config = IndexConfig(
+    output_path="./public/pagefind",
 )
-await index.write_files()
+async with PagefindIndex(config=config) as index:
+    # ... add content to index
+
+    # write files to the configured output path for the index:
+    await index.write_files()
+
+    # write files to a different output path:
+    await index.write_files(output_path="./custom/pagefind")
+
+    # prevent also writing files when closing the `PagefindIndex`:
+    await index.delete_index()
 ```
 
 The `output_path` option should contain the path to the desired Pagefind bundle directory. If relative, is relative to the current working directory of your Python process.

pagefind/integration_tests/python_api/py-close-the-pagefind-backend.toolproof.yml

@@ -0,0 +1,38 @@
+name: Python API > Close the Pagefind backend
+platforms:
+  - linux
+  - mac
+
+steps:
+  - ref: ./background.toolproof.yml
+  - step: I have a "public/run.py" file with the content {python}
+    python: |2-
+      import sys
+      sys.path.append('%repo_wd%/wrappers/python/src')
+
+      import asyncio
+      import json
+      import logging
+      import os
+      from pagefind.index import PagefindIndex, IndexConfig
+
+      async def main():
+        async with PagefindIndex() as index:
+          files = await index.get_files()
+
+          for file in files:
+            print(file["path"])
+
+          await index.delete_index()
+
+          try:
+            files = await index.get_files()
+          except AssertionError:
+            print("errored getting files after close")
+
+      if __name__ == "__main__":
+        asyncio.run(main())
+  - step: I run "cd public && PAGEFIND_BINARY_PATH=%pagefind_exec_path% python3 run.py"
+  - step: stdout should contain "pagefind.js"
+  - step: stdout should contain "pagefind-ui.js"
+  - step: stdout should contain "errored getting files after close"

wrappers/python/src/pagefind/index/__init__.py

@@ -265,8 +265,10 @@ async def __aexit__(
         exc_value: Optional[Any],
         traceback: Optional[Any],
     ) -> None:
-        assert self._service is not None
-        assert self._index_id is not None
+        if self._service is None:
+            return
+        if self._index_id is None:
+            return
         if exc_type is None:
             await self.write_files()
         await self._service.close()