python api docs & examples for registrable Menu/Panel/Operator/PropertyGroup classes.

doc/python_api/examples/bpy.ops.1.py

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+"""
+Execution Context
++++++++++++++++++
+
+When calling an operator you may want to pass the execution context.
+
+This determines the context thats given to the operator to run in, and weather
+invoke() is called or execute().
+
+'EXEC_DEFAULT' is used by default but you may want the operator to take user
+interaction with 'INVOKE_DEFAULT'.
+
+The execution context is as a non keyword, string argument in:
+('INVOKE_DEFAULT', 'INVOKE_REGION_WIN', 'INVOKE_REGION_CHANNELS',
+'INVOKE_REGION_PREVIEW', 'INVOKE_AREA', 'INVOKE_SCREEN', 'EXEC_DEFAULT',
+'EXEC_REGION_WIN', 'EXEC_REGION_CHANNELS', 'EXEC_REGION_PREVIEW', 'EXEC_AREA',
+'EXEC_SCREEN')
+"""
+
+# group add popup
+import bpy
+bpy.ops.object.group_instance_add('INVOKE_DEFAULT')