蟒蛇： <lambda> TypeError：“ NoneType”對象不可調用

Question

我正在嘗試從另一個名為Edit_user_admin的函數調用一個名為Add_user函數，我敢肯定我已經正確地編寫了所有內容，但是我仍然遇到相同的錯誤。

  File "G:/PVH_work/PVH_program/ParkTheReal.py", line 395, in <lambda>
    Add_user = ttk.Button(frame_27, text="Add User", command=lambda: Add_user(frame_27, data_dictionary)).grid(row=1, column=0)
  TypeError: 'NoneType' object is not callable

這是功能Edit_user_admin ：

def Edit_user_admin(form_item, data_dictionary, row_num):
    form_item.grid_forget()
    frame_27 = Frame(gui)
    frame_27.grid()

    MyProfile = ttk.Button(frame_27, text="My profile", command=lambda: My_profile_admin(frame_27, data_dictionary, row_num)).grid(row=0, column=0)
    TrainingRecord = ttk.Button(frame_27, text="Training Record", command=lambda: Training_record_admin(frame_27, data_dictionary, row_num)).grid(row=0, column=1)
    Compare = ttk.Button(frame_27, text="Compare", command=lambda: Compare_admin(frame_27, data_dictionary, row_num)).grid(row=0, column=2)
    EditUsers = ttk.Button(frame_27, text="Edit Users", command=lambda: Edit_user_admin(frame_27, data_dictionary, row_num)).grid(row=0, column=3)
    Team = ttk.Button(frame_27, text="View/Edit Team", command=lambda: Team_admin(frame_27, data_dictionary, row_num)).grid(row=0, column=4)
    Logout = ttk.Button(frame_27, text="Logout", command=lambda: Logout(frame_27)).grid(row=0, column=5)

    Add_user = ttk.Button(frame_27, text="Add User", command=lambda: Add_user(frame_27, data_dictionary, row_num)).grid(row=1, column=0)
    Edit_user = ttk.Button(frame_27, text="Edit User", command=lambda: Edit_user(frame_27, data_dictionary, row_num)).grid(row=1, column=1)
    Remove_user = ttk.Button(frame_27, text="Remove User", command=lambda: Remove_user(frame_27, data_dictionary, row_num)).grid(row=1, column=2)

這是函數Add_user ：

def Add_user(form_item, data_dictionary, row_num):
    form_item.grid_forget()
    frame_28 = Frame(gui)
    frame_28.grid()

    #Declare variables for creating a new user account
    __Username  = StringVar()
    __Name      = StringVar()
    __Age       = StringVar()
    __Email     = StringVar()
    __DoB       = StringVar()



    MyProfile = ttk.Button(frame_28, text="My profile", command=lambda: My_profile_admin(frame_28, data_dictionary, row_num)).grid(row=0, column=0)
    TrainingRecord = ttk.Button(frame_28, text="Training Record", command=lambda: Training_record_admin(frame_28, data_dictionary, row_num)).grid(row=0, column=1)
    Compare = ttk.Button(frame_28, text="Compare", command=lambda: Compare_admin(frame_28, data_dictionary, row_num)).grid(row=0, column=2)
    EditUsers = ttk.Button(frame_28, text="Edit Users", command=lambda: Edit_user_admin(frame_28, data_dictionary, row_num)).grid(row=0, column=3)
    Team = ttk.Button(frame_28, text="View/Edit Team", command=lambda: Team_admin(frame_28, data_dictionary, row_num)).grid(row=0, column=4)
    Logout = ttk.Button(frame_28, text="Logout", command=lambda: Logout_so(frame_28)).grid(row=0, column=5)

我在其他函數上遇到了此錯誤，但是我發現在要嘗試調用其名稱的函數中添加了“ _”，然后將它們的擴展名添加到了該命令中。

Answer 1

您將None分配給Add_user ； ttk.Button.grid()返回None ：

Add_user = ttk.Button(...).grid(row=1, column=0)

你不應該為按鈕參考和功能使用相同的名稱; 在這種情況下，Python將使用局部變量，而不是全局函數。

使用不同的名稱，並調用.grid() 分開 ：

add_user_button = ttk.Button(
    frame_27, text="Add User", 
    command=lambda: Add_user(frame_27, data_dictionary, row_num))
add_user_button.grid(row=1, column=0)

其他按鈕也一樣。

但是，如果您在其他任何地方都沒有使用add_user_button引用，則可以將其add_user_button一行，但是不必為分配結果而煩惱：

ttk.Button(
    frame_27, text="Add User", 
    command=lambda: Add_user(frame_27, data_dictionary, row_num)
).grid(row=1, column=0)