Pythonx Low-Level

Mix.install([
  {:pythonx, "~> 0.2"},
  {:kino, "~> 0.14"}
])

Initialize

alias Pythonx.C
alias Pythonx.C.PyDict
alias Pythonx.C.PyErr
alias Pythonx.C.PyFloat
alias Pythonx.C.PyList
alias Pythonx.C.PyLong
alias Pythonx.C.PyObject
alias Pythonx.C.PyRun
alias Pythonx.C.PyTuple
alias Pythonx.C.PyUnicode

Pythonx.initialize_once()

globals = PyDict.new()
locals = PyDict.new()

Local variables

a = PyLong.from_long(1)
PyDict.set_item_string(locals, "a", a)

PyDict.get_item_string(locals, "a") |> PyLong.as_long()

PyObject.print(a, :stdout, 0)

PyObject.print(locals, :stdout, 0)

PyDict.get_item_string(locals, "l")

b = PyLong.from_long(2)
PyDict.set_item_string(locals, "b", b)

PyObject.print(locals, :stdout, 0)

items = PyDict.items(locals)

Enum.into(0..(PyList.size(items) - 1), %{}, fn index ->
  items
  |> PyList.get_item(index)
  |> then(fn tuple ->
    {
      tuple |> PyTuple.get_item(0) |> PyUnicode.as_utf8(),
      tuple |> PyTuple.get_item(1) |> PyLong.as_long()
    }
  end)
end)

Run Python code

PyRun.string("c = a + b", C.py_file_input(), globals, locals)

PyObject.print(locals, :stdout, 0)

PyDict.get_item_string(locals, "c") |> PyLong.as_long()

result = PyRun.string("n = m + 1", C.py_file_input(), globals, locals)

case result do
  %PyErr{} ->
    PyUnicode.as_utf8(result.value)
  _ ->
    nil
end

PyRun.string("d = a / b", C.py_file_input(), globals, locals)
PyRun.string("e = 99 if a == 0 else -1", C.py_file_input(), globals, locals)
PyRun.string("f = [i ** 2 for i in range(10)]", C.py_file_input(), globals, locals)

PyObject.print(locals, :stdout, 0)

PyDict.get_item_string(locals, "d") |> PyFloat.as_double()

Global variables

globals = PyDict.new()
locals = PyDict.new()

PyDict.set_item_string(locals, "x", PyLong.from_long(1))
PyDict.set_item_string(globals, "x", PyLong.from_long(1))
PyDict.set_item_string(globals, "z", PyLong.from_long(99))

PyObject.print(locals, :stdout, 0)
PyObject.print(globals, :stdout, 0)

PyRun.string("""
x = 2
z = z + 1
y = z + 1
""", C.py_file_input(), globals, locals)

PyObject.print(locals, :stdout, 0)
PyObject.print(globals, :stdout, 0)