error: Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'packages_distributions')

Trying to run this for the first time.

Code

```js
import { pip } from "https://deno.land/x/python/ext/pip.ts";

const np = await pip.import("numpy");
const plt = await pip.import("matplotlib", "matplotlib.pyplot");

const xpoints = np.array([1, 8]);
const ypoints = np.array([3, 10]);

plt.plot(xpoints, ypoints);
plt.show();
```

Terminal

```
PS C:\Users\MyUser\Downloads> $env:DENO_PYTHON_PATH='C:\Users\MyUser\AppData\Local\Programs\Python\Python310\python310.dll'; deno run -A --unstable --allow-net=deno.com .\deno1.js
Installing numpy
WARNING: Target directory C:\Users\MyUser\AppData\Local\deno\plug\pip\numpy already exists. Specify --upgrade to force replacement.
WARNING: Target directory C:\Users\MyUser\AppData\Local\deno\plug\pip\numpy-1.25.2.dist-info already exists. Specify --upgrade to force replacement.
WARNING: Target directory C:\Users\MyUser\AppData\Local\deno\plug\pip\bin already exists. Specify --upgrade to force replacement.

[notice] A new release of pip available: 22.3.1 -> 23.2.1
[notice] To update, run: deno.exe -m pip install --upgrade pip
error: Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'packages_distributions')
const packages = importlib.metadata.packages_distributions();
^
at Pip.import (https://deno.land/x/python@0.3.1/ext/pip.ts:130:41)
at eventLoopTick (ext:core/01_core.js:183:11)
at async file:///C:/Users/MyUser/Downloads/deno1.js:3:12
PS C:\Users\MyUser\Downloads> deno --version
deno 1.36.1 (release, x86_64-pc-windows-msvc)
v8 11.6.189.12
typescript 5.1.6
PS C:\Users\MyUser\Downloads>
```

Riproduci l'esempio Windows con Deno 1.36.1 e Python 3.10, quindi ispeziona ext/pip.ts nel punto di ingresso Pip.import intorno alla riga 130. Traccia il motivo per cui importlib.metadata è undefined durante la lettura di packages_distributions; il lavoro è completato quando la chiamata pip.import indicata non solleva più questo TypeError.

Scritto dal modello di indicizzazione a partire dal testo della issue.