added with_graph/plot_support() functions to check whether pww3 has graph/plot support via pygraphviz/matplotlib

Author: fracpete

CHANGES.rst

@@ -12,6 +12,10 @@ Changelog
   a requirements text file now as well
 - added `pww_version()` function to `weka.core.version` to obtain the installed
   version of python-weka-wrapper3
+- added `with_graph_support()` function to `weka.core.version` to see whether
+  python-weka-wrapper3 has support for graphs using pygraphviz
+- added `with_plot_support()` function to `weka.core.version` to see whether
+  python-weka-wrapper3 has plotting support via matplotlib
 - added sub-command `bootstrap` to the `pww-packages` command-line tool to output a
   Python script that can reinstall python-weka-wrapper3 and all the packages in
   another virtual environment or even another machine

python/weka/core/version.py

@@ -40,3 +40,31 @@ def pww_version():
         return importlib.metadata.version('python-weka-wrapper3')
     except:
         return None
+
+
+def with_graph_support():
+    """
+    Checks whether pygraphviz is installed for graph support.
+
+    :return: True if with pygraphviz support
+    :rtype: bool
+    """
+    try:
+        importlib.metadata.version('pygraphviz')
+        return True
+    except:
+        return False
+
+
+def with_plot_support():
+    """
+    Checks whether matplotlib is installed for plot support.
+
+    :return: True if with matplotlib support
+    :rtype: bool
+    """
+    try:
+        importlib.metadata.version('matplotlib')
+        return True
+    except:
+        return False