Update __init__.py

Revise docstring to match behavior specified by Serhiy. Rearrange code to match.
python · GiovaLomba · Jan 6, 2020 · Jan 6, 2020 · Jan 11, 2020 · Jan 15, 2020
commit 597ef390423d5d143e768d0c044ed6141be75b8e
diff --git a/Lib/tkinter/__init__.py b/Lib/tkinter/__init__.py
@@ -1385,14 +1385,20 @@ def bind(self, sequence=None, func=None, add=None):
         return self._bind(('bind', self._w), sequence, func, add)
 
     def unbind(self, sequence, funcid=None):
-        """Unbind for this widget the event SEQUENCE. if
-        FUNCID is given, delete the command also."""
-        funcs = self.tk.call('bind', self._w, sequence, None)
-        self.tk.call('bind', self._w, sequence, '')
-        if funcid:
-            self.deletecommand(funcid)
-            keep = '\n'.join(f for f in funcs.split('\n') if not f.startswith(f'if {{"[{funcid}'))
+        """Unbind for this widget the event SEQUENCE.
+
+        If FUNCID is given, only unbind the function identified with FUNCID.
+        and also delete that command.
+        """
+        if funcid is None:
+            self.tk.call('bind', self._w, sequence, None)
+        else:
+            funcs = self.tk.call('bind', self._w, sequence, None).split('\n')
+            keep = '\n'.join(f for f in funcs.split('\n')
+                             if not f.startswith(f'if {{"[{funcid}'))
             self.tk.call('bind', self._w, sequence, keep)
+            self.deletecommand(funcid)
+
 
     def bind_all(self, sequence=None, func=None, add=None):
         """Bind to all widgets at an event SEQUENCE a call to function FUNC.