21 lines
914 B
Markdown
21 lines
914 B
Markdown
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# PyPy Support
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Using PyPy is supported via cpyext.
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Support is only provided for building rust extension for code running under PyPy. This means PyPy **cannot** be called from rust via cpyext. Note that there some differences in the ffi module between pypy and cpython.
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This is a limitation of cpyext and supported for embedding cpyext is not planned.
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Compilation against PyPy is done by exporting the `PYTHON_SYS_EXECUTABLE` to a pypy binary or by compiling in a PyPy virtualenv.
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For example, `PYTHON_SYS_EXECUTABLE="/path/to/pypy3" /path/to/pypy3 setup.py install`
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## Unsupported Features
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These are features currently supported by PyO3, but not yet implemented in cpyext.
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- Complex number functions (`_Py_c_sum`, `_Py_c_sum` ..)
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- Conversion to rust's i128, u128 types.
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- `PySequence_Count` (which is used to count number of element in array)
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- `PyDict_MergeFromSeq2` (used in `PyDict::from_sequence`)
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