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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```
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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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## 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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