check on python3 dependencies (#437)

Author: fredroy

bindings/SofaRuntime/package/__init__.py

@@ -18,6 +18,21 @@
 ###################### MODULES INPORTS & UNLOAD FEATURES ######################
 ###############################################################################
 
+
+try:
+    import numpy
+except ModuleNotFoundError as error:
+    Sofa.msg_error("SofaRuntime",str(error))
+    Sofa.msg_error("SofaRuntime", 'numpy is mandatory for SofaPython3')
+    sys.exit(1)
+
+try:
+    import scipy
+except ModuleNotFoundError as error:
+    Sofa.msg_warning("SofaRuntime",str(error))
+    Sofa.msg_warning("SofaRuntime", "scipy is strongly recommended for SofaPython3")
+    pass
+
 # Keep a list of the modules always imported in the Sofa-PythonEnvironment
 try:
     __SofaPythonEnvironment_importedModules__