package/python-mpmath: new package

mpmath is a free (BSD licensed) Python library for real and
complex floating-point arithmetic with arbitrary precision.

https://mpmath.org/

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/testing/tests/package/sample_python_mpmath.py

@@ -0,0 +1,16 @@
+#! /usr/bin/env python3
+
+# Test inspired from example published on the project page:
+# https://mpmath.org/
+
+from mpmath import mp
+
+mp.dps = 50
+
+result = mp.quad(lambda x: mp.exp(-x**2), [-mp.inf, mp.inf]) ** 2
+
+# Pi digits can be cross-checked here:
+# https://www.angio.net/pi/digits.html
+expected_result = "3.1415926535897932384626433832795028841971693993751"
+
+assert str(result) == expected_result

support/testing/tests/package/test_python_mpmath.py

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+from tests.package.test_python import TestPythonPackageBase
+
+
+class TestPythonPy3MpMath(TestPythonPackageBase):
+    __test__ = True
+
+    config = TestPythonPackageBase.config + \
+        """
+        BR2_PACKAGE_PYTHON3=y
+        BR2_PACKAGE_PYTHON_MPMATH=y
+        """
+    sample_scripts = ["tests/package/sample_python_mpmath.py"]