add python mode to the editor (can execute and run python scripts).

scripts/python/gtkgui/pythoncontext.py

@@ -0,0 +1,60 @@
+import sys
+import traceback
+
+class PythonExecutionContext(object):
+    """
+    A class representing an independent execution context.
+    It can store global symbols for the scripts executed herein, and
+    has functions to run and evaluate python code.
+    """
+    def __init__(self):
+        self._exec_dict = {}
+
+    def __setitem__(self,name,value):
+        """
+        Set a symbol into the execution context dictionary.
+        """
+        self._exec_dict[name] = value
+
+    def __getitem__(self,name):
+        """
+        Get a symbol from the execution context dictionary.
+        """
+        return self._exec_dict[name]
+
+    def __contains__(self,name):
+        """
+        See if the execution context holds some symbol.
+        """
+        return name in self._exec_dict
+
+    def RunFromFile(self,filename):
+        """
+        Run a script into this execution context directly from a file.
+        """
+        def printerr(error):
+            print " * "+filename+": "+error
+        f = open(filename,"r")
+        self.RunUserCode(f.read(),printerr)
+        f.close()
+
+    def RunUserCode(self, script, printfunc,mode="single"):
+        """
+        Run some text (python code) into this execution context.
+        """
+        assigned_object = None # if we make a print we also return the printed eval
+        # Try and run the user entered line(s)
+        try:
+                if script.startswith("print"):
+                     try:
+                         assigned_object = eval(script[5:].strip(),self._exec_dict)
+                     except:
+                         traceback.print_exc()
+                exec(script,self._exec_dict)
+        except: # Prints the REAL exception.
+                error = '%s:  %s' % (sys.exc_type.__name__, sys.exc_value)
+                for errorLine in error.split('\n'):
+                        printfunc(errorLine+"\n") # new line to type into
+                #traceback.print_exc()
+        return assigned_object
+