2019-05-03 17:43:31 +00:00
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# Installing packages from PyPI
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Pyodide has experimental support for installing pure Python wheels from PyPI.
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For use in Iodide:
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```
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%% py
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import micropip
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micropip.install('snowballstemmer')
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# Iodide implicitly waits for the promise to resolve when the packages have finished
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# installing...
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%% py
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import snowballstemmer
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2019-09-24 08:52:02 +00:00
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stemmer = snowballstemmer.stemmer('english')
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2019-05-03 17:43:31 +00:00
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stemmer.stemWords('go goes going gone'.split())
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```
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For use outside of Iodide (just Python), you can use the `then` method on the
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`Promise` that `micropip.install` returns to do work once the packages have
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finished loading:
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2020-05-11 08:06:33 +00:00
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```py
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2019-05-03 17:43:31 +00:00
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def do_work(*args):
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2020-05-08 21:22:33 +00:00
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import snowballstemmer
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stemmer = snowballstemmer.stemmer('english')
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print(stemmer.stemWords('go goes going gone'.split()))
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2019-05-03 17:43:31 +00:00
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import micropip
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micropip.install('snowballstemmer').then(do_work)
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```
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2020-05-08 21:22:33 +00:00
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2020-05-11 08:30:25 +00:00
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Micropip implements file integrity validation by checking the hash of the
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downloaded wheel against pre-recorded hash digests from the PyPi JSON API.
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2020-05-11 08:06:33 +00:00
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## Installing wheels from arbitrary URLs
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Pure python wheels can also be installed from any URL with micropip,
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```py
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import micropip
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micropip.install(
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'https://example.com/files/snowballstemmer-2.0.0-py2.py3-none-any.whl'
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)
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```
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The wheel name in the URL must follow [PEP 427 naming
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convention](https://www.python.org/dev/peps/pep-0427/#file-format), which will
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2020-05-11 08:34:34 +00:00
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be the case if the wheels is made using standard python tools (`pip wheel`,
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2020-05-11 08:06:33 +00:00
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`setup.py bdist_wheel`).
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The remote server must set Cross-Origin Resource Sharing (CORS) headers to
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allow access. Otherwise, you can prepend a CORS proxy to the URL. Note however
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that using third-party CORS proxies has security implications, particularly
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since we are not able to check the file integrity, unlike with installs from
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PyPi.
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2020-05-08 21:22:33 +00:00
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## Complete example
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Adapting the setup from the section on ["using pyodide from
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javascript"](./using_pyodide_from_javascript.html) a complete example would be,
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```html
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<html>
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<head>
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<meta charset="utf-8">
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</head>
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<body>
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<script type="text/javascript" src="https://pyodide.cdn.iodide.io/pyodide.js"></script>
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<script type="text/javascript">
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pythonCode = `
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def do_work(*args):
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import snowballstemmer
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stemmer = snowballstemmer.stemmer('english')
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print(stemmer.stemWords('go goes going gone'.split()))
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import micropip
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micropip.install('snowballstemmer').then(do_work)
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`
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languagePluginLoader.then(() => {
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return pyodide.loadPackage(['micropip'])
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}).then(() => {
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pyodide.runPython(pythonCode);
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})
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</script>
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</body>
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</html>
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```
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