AttributeError：'_tkinter.tkapp'对象没有属性'sidebar_button_event'错误

Question

我正在尝试从 CustomTkinter 网站/github 修改complex_example.py，以便我可以让它最终修改鱼喂食机中使用的一些文件参数。

当我在 PyCharm 中运行代码时，我得到了我期望的窗口（忽略明显的大小问题）。

但是，每当我单击任何按钮（例如“取消”按钮）时，我都会收到以下错误

文件 “/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/tkinter/init.py”， 第 2345 行，位于 getattr 返回 getattr(self.tk, attr)

AttributeError：“_tkinter.tkapp”对象没有属性 'sidebar_button_event'

奇怪的是，当我运行原始的complex_example.py时，按钮没有问题。

我确信这个问题是显而易见的，但我仍在学习 Python，而 Google 并不是我的朋友。

任何帮助将不胜感激。

import sys
#import tkinter
#import tkinter.messagebox
import customtkinter

customtkinter.set_appearance_mode("System")  # Modes: "System" (standard), "Dark", "Light"
customtkinter.set_default_color_theme("blue")  # Themes: "blue" (standard), "green", "dark-blue"

class App(customtkinter.CTk):
    current_speed = 0
    current_direction = "Clockwise"
    current_steps = 0

    def __init__(self):
        super().__init__()

#   Begin row count
        r=0

#   Set column to 0
        c=0

#   Set speed entry
        current_speed=0

#   Set direction
        current_direction=f"Clockwise"

#   Set steps per feeding
        current_steps_feeding=200

# configure window
        self.title("Motor Options")
        self.geometry(f"{750}x{385}")

# configure grid layout (4x4)
#        self.grid_columnconfigure((0, 1, 2, 3), weight=1)
#        self.grid_rowconfigure((0, 1, 2), weight=1)

 # create sidebar frame with widgets
        self.sidebar_frame = customtkinter.CTkFrame(self, width=750, corner_radius=0)
        self.sidebar_frame.grid(row=0, column=c, rowspan=3, sticky="nsew")
#        self.sidebar_frame.grid_rowconfigure(9, weight=1)

        self.logo_label = customtkinter.CTkLabel(self.sidebar_frame, text="Motor Options", font=customtkinter.CTkFont(size=20, weight="bold"))
        self.logo_label.grid(row=r, column=c, columnspan=4, padx=20, pady=(10,10))

        r +=1
        self.logo_label = customtkinter.CTkLabel(self.sidebar_frame, text="Speed", font=customtkinter.CTkFont(size=20, weight="bold"))
        self.logo_label.grid(row=r, column=c, padx=20, pady=(10,10))

#   Speed up
        c +=1
        self.sidebar_button_1 = customtkinter.CTkButton(self.sidebar_frame, command=lambda: self.sidebar_button_event(1))
        self.sidebar_button_1.grid(row=r, column=c, padx=20, pady=(10,10))

#   Speed down
        c +=1
        self.sidebar_button_2 = customtkinter.CTkButton(self.sidebar_frame, command=lambda: self.sidebar_button_event(2))
        self.sidebar_button_2.grid(row=r, column=c, padx=20, pady=(10,10))

# create Speed entry box
        c +=1
        self.entry_speed = customtkinter.CTkEntry(self.sidebar_frame, placeholder_text=current_speed)
        self.entry_speed.grid(row=r, column=c,  padx=20, pady=(10,10))

#   Cancel
        r +=1
        self.sidebar_button_16 = customtkinter.CTkButton(self.sidebar_frame, command=lambda: self.sidebar_button_event(16))
        self.sidebar_button_16.grid(row=r, column=c, padx=20, pady=(10,10))

# set default values
        self.sidebar_button_1.configure(text="Faster")
        self.sidebar_button_2.configure(text="Slower")
        self.sidebar_button_16.configure(text="Cancel")

        def sidebar_button_event(buttonNum):

            if buttonNum == 1:
                print(f"Faster")
                print(f"Attempt to increase speed beyond 100, speed set to 100")
            elif buttonNum == 2:
                print(f"Slower")
            elif buttonNum == 16:
                print(f"Cancel")
                sys.exit(0)

if __name__ == "__main__":
    app = App()
    app.mainloop()