erp5_data_notebook : Check for matplotlib.pyplot module object in Base_displayImage

The external method Base_displayImage displays images of two kind: plot and OFS image
saved in erp5. We had earlier checks for erp5 images but no check to for matplotlib
plot images.

bt5/erp5_data_notebook/ExtensionTemplateItem/portal_components/extension.erp5.JupyterCompile.py

@@ -7,6 +7,7 @@ from OFS.Image import Image as OFSImage
 import sys
 import ast
 import types
+import inspect
 
 mime_type = 'text/plain'
 # IPython expects 2 status message - 'ok', 'error'
@@ -222,9 +223,11 @@ def Base_displayImage(self, image_object=None):
     if isinstance(image_object, OFSImage):
       figdata = base64.b64encode(image_object.getData())
       mime_type = image_object.getContentType()
-    else:
-      # For matplotlib objects
-      # XXX: Needs refactoring to handle cases
+
+    # Ensure that the object we are taking as `image_object` is basically a
+    # Matplotlib.pyplot module object from which we are seekign the data of the
+    # plot .
+    elif inspect.ismodule(image_object) and image_object.__name__=="matplotlib.pyplot":
 
       # Create a ByteFile on the server which would be used to save the plot
       figfile = StringIO()

bt5/erp5_data_notebook/ExtensionTemplateItem/portal_components/extension.erp5.JupyterCompile.xml

@@ -46,12 +46,12 @@
             <key> <string>text_content_warning_message</string> </key>
             <value>
               <tuple>
-                <string>W: 54,  2: Using the global statement (global-statement)</string>
-                <string>W: 94,  8: Use of exec (exec-used)</string>
-                <string>W:118,  8: Use of exec (exec-used)</string>
-                <string>W:124,  8: Use of exec (exec-used)</string>
-                <string>W:219,  4: Using the global statement (global-statement)</string>
-                <string>W:317,  2: Using the global statement (global-statement)</string>
+                <string>W: 55,  2: Using the global statement (global-statement)</string>
+                <string>W: 95,  8: Use of exec (exec-used)</string>
+                <string>W:119,  8: Use of exec (exec-used)</string>
+                <string>W:125,  8: Use of exec (exec-used)</string>
+                <string>W:220,  4: Using the global statement (global-statement)</string>
+                <string>W:320,  2: Using the global statement (global-statement)</string>
               </tuple>
             </value>
         </item>