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Return numpy array from python to Lazarus#488

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Chemistza74 asked this question inQ&A
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Hi,

I've recently started playing around with P4D in Lazarus/FPC. I'm trying to read a numpy array created in python back in to FPC. The python code which I have in SynEdit1:

import numpy as nppy_array = np.zeros(10)for i in range (10):    py_array[i]=i

My attempt at the FPC code below to extract py_array is based on FPC Demo35:

const  N = 10;type  PIntArray = ^TIntArray;  TIntArray = array[0..N - 1] of NativeInt;  procedure TForm1.Button1Click(Sender: TObject);var  np_arr: PPyObject;  PyBuffer: Py_buffer;  I:integer;  res:int64;begin  self.PythonEngine1.ExecStrings(self.SynEdit1.lines);  np_arr := ExtractPythonObjectFrom(MainModule.py_array);  PythonEngine1.PyObject_GetBuffer(np_arr, @PyBuffer, PyBUF_CONTIG);  PythonEngine1.CheckError;  try    for I := 0 to N - 1 do      res:= PIntArray(PyBuffer.buf)^[I];      self.ListBox1.Items.Add(inttostr(res));  finally    PythonEngine1.PyBuffer_Release(@PyBuffer);  end;end;

However, when I run this, I only end up with a single, random number in ListBox1. Any suggestions on how to resolve this would be greatly appreciated!

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Replies: 1 comment

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If you run this code in PyScripter

importnumpyasnppy_array=np.zeros(10)foriinrange (10):py_array[i]=iprint(py_array)

The output is:

[0. 1. 2. 3. 4. 5. 6. 7. 8. 9.]

Notice that the values are floating point and you try to read them as Integers.

I think if you change your code to:

importnumpyasnppy_array=np.zeros(10,dtype=np.int32)foriinrange (10):py_array[i]=i

or simpler:

importnumpyasnppy_array=np.array(range(10))

it should work.

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