PY-32005 Importing matplotlib 3.0.0 crashes Python Console

Wait for full pyplot import to get access to `matplotlib.rcParams` attribute, which was changed in version 3

python/helpers/pydev/_pydev_bundle/pydev_import_hook.py

@@ -8,6 +8,7 @@ class ImportHookManager(ModuleType):
         ModuleType.__init__(self, name)
         self._system_import = system_import
         self._modules_to_patch = {}
+        self.inside_activation = False
 
     def add_module_name(self, module_name, activate_function):
         self._modules_to_patch[module_name] = activate_function
@@ -19,11 +20,13 @@ class ImportHookManager(ModuleType):
 
         module = self._system_import(name, *args, **kwargs)
         try:
-            if activate_func:
+            if activate_func and not self.inside_activation:
+                self.inside_activation = True
                 succeeded = activate_func()
                 if succeeded and name in self._modules_to_patch:
                     # Remove if only it was executed correctly
                     self._modules_to_patch.pop(name)
+                self.inside_activation = False
         except:
             sys.stderr.write("Matplotlib support failed\n")
             traceback.print_exc()
@@ -38,4 +41,4 @@ else:
 import_hook_manager = ImportHookManager(__name__ + '.import_hook', builtins.__import__)
 builtins.__import__ = import_hook_manager.do_import
 sys.modules[import_hook_manager.__name__] = import_hook_manager
-del builtins
+del builtins

python/helpers/pydev/pydev_ipython/matplotlibtools.py

@@ -85,6 +85,10 @@ def patch_is_interactive():
     matplotlib.is_interactive = patched_is_interactive
 
 
+def _get_major_version(module):
+    return int(module.__version__.split('.')[0])
+
+
 def activate_matplotlib(enable_gui_function):
     """Set interactive to True for interactive backends.
     enable_gui_function - Function which enables gui, should be run in the main thread.
@@ -93,6 +97,16 @@ def activate_matplotlib(enable_gui_function):
     if not hasattr(matplotlib, 'rcParams'):
         # matplotlib module wasn't fully imported, try later
         return False
+
+    if _get_major_version(matplotlib) >= 3:
+        # since matplotlib 3.0, accessing `matplotlib.rcParams` lead to pyplot import,
+        # so we need to wait until necessary pyplot attributes will be imported as well
+        if 'matplotlib.pyplot' not in sys.modules:
+            return False
+        pyplot = sys.modules['matplotlib.pyplot']
+        if not hasattr(pyplot, 'switch_backend'):
+            return False
+
     gui, backend = find_gui_and_backend()
     is_interactive = is_interactive_backend(backend)
     if is_interactive: