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73 lines
2.1 KiB
Markdown
73 lines
2.1 KiB
Markdown
---
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layout: developer-doc
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title: Polyglot Python
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category: polyglot
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tags: [polyglot, python]
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order: 4
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---
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# Polyglot Python
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This document provides practical example showing polyglot interoperability with
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Python in the runtime. Please familiarise yourself with the general operation of
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[polyglot bindings](./polyglot-bindings.md).
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<!-- MarkdownTOC levels="2,3" autolink="true" -->
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- [Polyglot Library System](#polyglot-library-system)
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- [Using Python Libraries](#using-python-libraries)
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<!-- /MarkdownTOC -->
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## Polyglot Library System
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There is a support for using any Python library from Enso. Steps to include
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`numpy` in a new Enso project follows:
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```bash
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$ enso-engine*/bin/enso --new numenso
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$ find numenso/
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numenso/
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numenso/src
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numenso/src/Main.enso
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numenso/package.yaml
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$ mkdir numenso/polyglot
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$ graalvm/bin/gu install python
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$ graalvm/bin/graalpy -m venv numenso/polyglot/python
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$ ./numenso/polyglot/python/bin/graalpy -m pip install numpy
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Successfully installed numpy-1.23.5
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```
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The above steps instruct Enso to create a new project in `numenso` directory.
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Then they create Python virtual environment in `numenso/polyglot/python/` dir -
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e.g. in the
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[standard location for polyglot](../distribution/packaging.md#the-polyglot-directory)
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components of an Enso project. As a last step we activate the virtual
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environment and use `pip` manager to install `numpy` library.
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## Using Python Libraries
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As soon as a library is installed into the
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[polyglot directory](#polyglot-library-system) it can be used via the
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[embedded syntax](polyglot-bindings.md#embedded-syntax):
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```ruby
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foreign python random_array s = """
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import numpy
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return numpy.random.normal(size=s)
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main = random_array 10
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```
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Let's modify the `numenso/src/Main.enso` to use `numpy.random.normal` as shown
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above. Then we can simply execute the project and obtain a `numpy` array as a
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result:
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```bash
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$ enso-engine*/bin/enso --run numenso
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array([-0.51884419, -0.23670113, -1.20493508, -0.86008709, 0.59403118,
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-0.171484 , -1.19455596, -0.30096434, -0.69762239, -0.11411331])
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```
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The same steps can be applied to any Graal Python supported library.
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