diff --git a/customtkinter/windows/widgets/ctk_button.py b/customtkinter/windows/widgets/ctk_button.py
index bc3c4fa..0cac576 100644
--- a/customtkinter/windows/widgets/ctk_button.py
+++ b/customtkinter/windows/widgets/ctk_button.py
@@ -538,7 +538,7 @@ class CTkButton(CTkBaseClass):
 
     def bind(self, sequence: str = None, command: Callable = None, add: Union[str, bool] = True):
         """ called on the tkinter.Canvas """
-        if add != "+" or add is not True:
+        if not (add == "+" or add is True):
             raise ValueError("'add' argument can only be '+' or True to preserve internal callbacks")
         self._canvas.bind(sequence, command, add=True)
         self._text_label.bind(sequence, command, add=True)
diff --git a/customtkinter/windows/widgets/ctk_checkbox.py b/customtkinter/windows/widgets/ctk_checkbox.py
index 0b643d6..3d9b496 100644
--- a/customtkinter/windows/widgets/ctk_checkbox.py
+++ b/customtkinter/windows/widgets/ctk_checkbox.py
@@ -437,7 +437,7 @@ class CTkCheckBox(CTkBaseClass):
 
     def bind(self, sequence: str = None, command: Callable = None, add: Union[str, bool] = True):
         """ called on the tkinter.Canvas """
-        if add != "+" or add is not True:
+        if not (add == "+" or add is True):
             raise ValueError("'add' argument can only be '+' or True to preserve internal callbacks")
         self._canvas.bind(sequence, command, add=True)
         self._text_label.bind(sequence, command, add=True)
diff --git a/customtkinter/windows/widgets/ctk_combobox.py b/customtkinter/windows/widgets/ctk_combobox.py
index 5218d68..6970070 100644
--- a/customtkinter/windows/widgets/ctk_combobox.py
+++ b/customtkinter/windows/widgets/ctk_combobox.py
@@ -400,7 +400,7 @@ class CTkComboBox(CTkBaseClass):
 
     def bind(self, sequence=None, command=None, add=True):
         """ called on the tkinter.Entry """
-        if add != "+" or add is not True:
+        if not (add == "+" or add is True):
             raise ValueError("'add' argument can only be '+' or True to preserve internal callbacks")
         self._entry.bind(sequence, command, add=True)
 
diff --git a/customtkinter/windows/widgets/ctk_entry.py b/customtkinter/windows/widgets/ctk_entry.py
index 2c52937..6a2560b 100644
--- a/customtkinter/windows/widgets/ctk_entry.py
+++ b/customtkinter/windows/widgets/ctk_entry.py
@@ -283,7 +283,7 @@ class CTkEntry(CTkBaseClass):
 
     def bind(self, sequence=None, command=None, add=True):
         """ called on the tkinter.Entry """
-        if add != "+" or add is not True:
+        if not (add == "+" or add is True):
             raise ValueError("'add' argument can only be '+' or True to preserve internal callbacks")
         self._entry.bind(sequence, command, add=True)
 
diff --git a/customtkinter/windows/widgets/ctk_label.py b/customtkinter/windows/widgets/ctk_label.py
index 490fdd0..d6b6984 100644
--- a/customtkinter/windows/widgets/ctk_label.py
+++ b/customtkinter/windows/widgets/ctk_label.py
@@ -249,12 +249,12 @@ class CTkLabel(CTkBaseClass):
 
     def bind(self, sequence: str = None, command: Callable = None, add: str = True):
         """ called on the tkinter.Label and tkinter.Canvas """
-        if add != "+" or add is not True:
+        if not (add == "+" or add is True):
             raise ValueError("'add' argument can only be '+' or True to preserve internal callbacks")
         self._canvas.bind(sequence, command, add=True)
         self._label.bind(sequence, command, add=True)
 
-    def unbind(self, sequence: str, funcid: Optional[str] = None):
+    def unbind(self, sequence: str = None, funcid: Optional[str] = None):
         """ called on the tkinter.Label and tkinter.Canvas """
         if funcid is not None:
             raise ValueError("'funcid' argument can only be None, because there is a bug in" +
diff --git a/customtkinter/windows/widgets/ctk_optionmenu.py b/customtkinter/windows/widgets/ctk_optionmenu.py
index 3e6400c..8ca8186 100644
--- a/customtkinter/windows/widgets/ctk_optionmenu.py
+++ b/customtkinter/windows/widgets/ctk_optionmenu.py
@@ -398,7 +398,7 @@ class CTkOptionMenu(CTkBaseClass):
 
     def bind(self, sequence: str = None, command: Callable = None, add: Union[str, bool] = True):
         """ called on the tkinter.Canvas """
-        if add != "+" or add is not True:
+        if not (add == "+" or add is True):
             raise ValueError("'add' argument can only be '+' or True to preserve internal callbacks")
         self._canvas.bind(sequence, command, add=True)
         self._text_label.bind(sequence, command, add=True)
diff --git a/customtkinter/windows/widgets/ctk_progressbar.py b/customtkinter/windows/widgets/ctk_progressbar.py
index 110800c..084354d 100644
--- a/customtkinter/windows/widgets/ctk_progressbar.py
+++ b/customtkinter/windows/widgets/ctk_progressbar.py
@@ -291,7 +291,7 @@ class CTkProgressBar(CTkBaseClass):
 
     def bind(self, sequence: str = None, command: Callable = None, add: Union[str, bool] = True):
         """ called on the tkinter.Canvas """
-        if add != "+" or add is not True:
+        if not (add == "+" or add is True):
             raise ValueError("'add' argument can only be '+' or True to preserve internal callbacks")
         self._canvas.bind(sequence, command, add=True)
 
diff --git a/customtkinter/windows/widgets/ctk_radiobutton.py b/customtkinter/windows/widgets/ctk_radiobutton.py
index 4fc652d..d5eba87 100644
--- a/customtkinter/windows/widgets/ctk_radiobutton.py
+++ b/customtkinter/windows/widgets/ctk_radiobutton.py
@@ -405,7 +405,7 @@ class CTkRadioButton(CTkBaseClass):
 
     def bind(self, sequence: str = None, command: Callable = None, add: Union[str, bool] = True):
         """ called on the tkinter.Canvas """
-        if add != "+" or add is not True:
+        if not (add == "+" or add is True):
             raise ValueError("'add' argument can only be '+' or True to preserve internal callbacks")
         self._canvas.bind(sequence, command, add=True)
         self._text_label.bind(sequence, command, add=True)
diff --git a/customtkinter/windows/widgets/ctk_scrollbar.py b/customtkinter/windows/widgets/ctk_scrollbar.py
index 1c03095..1038282 100644
--- a/customtkinter/windows/widgets/ctk_scrollbar.py
+++ b/customtkinter/windows/widgets/ctk_scrollbar.py
@@ -259,7 +259,7 @@ class CTkScrollbar(CTkBaseClass):
 
     def bind(self, sequence=None, command=None, add=True):
         """ called on the tkinter.Canvas """
-        if add != "+" or add is not True:
+        if not (add == "+" or add is True):
             raise ValueError("'add' argument can only be '+' or True to preserve internal callbacks")
         self._canvas.bind(sequence, command, add=True)
 
diff --git a/customtkinter/windows/widgets/ctk_slider.py b/customtkinter/windows/widgets/ctk_slider.py
index 04e312c..3016a5c 100644
--- a/customtkinter/windows/widgets/ctk_slider.py
+++ b/customtkinter/windows/widgets/ctk_slider.py
@@ -375,7 +375,7 @@ class CTkSlider(CTkBaseClass):
 
     def bind(self, sequence: str = None, command: Callable = None, add: Union[str, bool] = True):
         """ called on the tkinter.Canvas """
-        if add != "+" or add is not True:
+        if not (add == "+" or add is True):
             raise ValueError("'add' argument can only be '+' or True to preserve internal callbacks")
         self._canvas.bind(sequence, command, add=True)
 
diff --git a/customtkinter/windows/widgets/ctk_switch.py b/customtkinter/windows/widgets/ctk_switch.py
index 0b6b8ef..3745bdd 100644
--- a/customtkinter/windows/widgets/ctk_switch.py
+++ b/customtkinter/windows/widgets/ctk_switch.py
@@ -444,7 +444,7 @@ class CTkSwitch(CTkBaseClass):
 
     def bind(self, sequence: str = None, command: Callable = None, add: Union[str, bool] = True):
         """ called on the tkinter.Canvas """
-        if add != "+" or add is not True:
+        if not (add == "+" or add is True):
             raise ValueError("'add' argument can only be '+' or True to preserve internal callbacks")
         self._canvas.bind(sequence, command, add=True)
         self._text_label.bind(sequence, command, add=True)
diff --git a/customtkinter/windows/widgets/ctk_textbox.py b/customtkinter/windows/widgets/ctk_textbox.py
index 7d1ad9d..1fa1331 100644
--- a/customtkinter/windows/widgets/ctk_textbox.py
+++ b/customtkinter/windows/widgets/ctk_textbox.py
@@ -328,7 +328,7 @@ class CTkTextbox(CTkBaseClass):
 
     def bind(self, sequence: str = None, command: Callable = None, add: Union[str, bool] = True):
         """ called on the tkinter.Canvas """
-        if add != "+" or add is not True:
+        if not (add == "+" or add is True):
             raise ValueError("'add' argument can only be '+' or True to preserve internal callbacks")
         self._textbox.bind(sequence, command, add=True)