mirror of https://github.com/pyodide/pyodide.git
43 lines
1.3 KiB
Markdown
43 lines
1.3 KiB
Markdown
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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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**IMPORTANT:** Since the packages hosted at `files.pythonhosted.org` don't
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support CORS requests, we use a CORS proxy at `cors-anywhere.herokuapp.com` to
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get package contents. This makes a man-in-the-middle attack on the package
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contents possible. However, this threat is minimized by the fact that the
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integrity of each package is checked using a hash obtained directly from
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`pypi.org`. We hope to have this improved in the future, but for now, understand
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the risks and don't use any sensitive data with the packages installed using
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this method.
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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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snowballstemmer.stemmer('english')
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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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import snowballstemmer
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snowballstemmer.stemmer('english')
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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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