Change fpoly imported module if fortran lib is present or not.

eastereig/fpoly/__init__.py

@@ -0,0 +1,31 @@
+# -*- coding: utf-8 -*-
+
+# This file is part of eastereig, a library to locate exceptional points
+# and to reconstruct eigenvalues loci.
+
+# Eastereig is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# Eastereig is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with Eastereig.  If not, see <https://www.gnu.org/licenses/>.
+
+"""
+Select the the good polynomial module (fast fortran full python fallback version).
+Neither `_fpolyval_full_py.py`, nor `_fpolyval.cpython-xxx.so`
+are supposed to be imported directly. One must use the `fpoly` module.
+
+See README for installation details.
+"""
+try:
+    # Fortran version
+    from ._fpoly import polyvalnd
+except ImportError:
+    # Python fallback version
+    from ._fpolyval_full_py import polyvalnd