Python 当我在另一个嵌套类函数中调用某个类函数时，该类函数失败_Python_Sqlite_Tkinter

Python 当我在另一个嵌套类函数中调用某个类函数时，该类函数失败

python sqlite tkinter

Python 当我在另一个嵌套类函数中调用某个类函数时，该类函数失败,python,sqlite,tkinter,Python,Sqlite,Tkinter,在我的程序中，我定义了如下函数： def update_household_information(self, parent): try: sub = tk.Toplevel(master=parent) sub.title(f"Update household") sub.resizable(height=False, width=False) # Cr

在我的程序中，我定义了如下函数：

    def update_household_information(self, parent):
        try:
            sub = tk.Toplevel(master=parent)
            sub.title(f"Update household")
            sub.resizable(height=False, width=False)

            # Create text entries
            id_ent = tk.Entry(sub, width=30)
            id_ent.grid(row=0, column=1, padx=20)

            # Create text labels
            id_lbl = tk.Label(sub, text="Enter the ID of the household to be updated: ")
            id_lbl.grid(row=0, column=0)

            # Create Submit Function for Database:
            def submit():
                try:
                    # Create the electric.db or connect to it
                    conn = sqlite3.connect('electric.db')
                    # Create cursor
                    c = conn.cursor()
                    c.execute("PRAGMA foreign_keys = ON")
                    # Check if area_id exist:
                    c.execute("""SELECT id FROM households""")
                    results = c.fetchall()
                    household_ids = []
                    for result in results:
                        household_ids.append(result[0])
                    if int(id_ent.get()) not in household_ids:
                        messagebox.showerror(message="Household ID does not exist")
                        sub.destroy()
                        self.update_household_information(parent)
                    else:
                        sub.destroy()
                        self.update_household_information_with_id(parent, id_ent.get())
                except Error as e:
                    return e

            # Create Submit Button
            submit_btn = tk.Button(sub, text="Submit", command=submit)
            submit_btn.grid(row=5, column=0, columnspan=2, ipadx=5, ipady=5, pady=5, padx=5)
        except Error as e:
            return e

    def update_household_information_with_id(self, parent, household_id):
        try:
            sub = tk.Toplevel(master=parent)
            sub.title(f"Update household {household_id}")
            sub.resizable(height=False, width=False)

            # Create text entries
            name_ent = tk.Entry(sub, width=30)
            name_ent.grid(row=1, column=1, padx=20)
            address_ent = tk.Entry(sub, width=30)
            address_ent.grid(row=2, column=1, padx=20)
            phone_number_ent = tk.Entry(sub, width=30)
            phone_number_ent.grid(row=3, column=1, padx=20)
            area_ent = tk.Entry(sub, width=30)
            area_ent.grid(row=4, column=1, padx=20)

            # Create text labels
            id_lbl = tk.Label(sub, text=f"Updating Household {household_id}: ")
            id_lbl.grid(row=0, column=0, columnspan=2)
            name_lbl = tk.Label(sub, text="Owner's name: ")
            name_lbl.grid(row=1, column=0)
            address_lbl = tk.Label(sub, text="Address: ")
            address_lbl.grid(row=2, column=0)
            phone_number_lbl = tk.Label(sub, text="Phone number: ")
            phone_number_lbl.grid(row=3, column=0)
            area_lbl = tk.Label(sub, text="Area: ")
            area_lbl.grid(row=4, column=0)

            # Create Submit Function for Database:
            def submit():
                try:
                    # Create the electric.db or connect to it
                    conn = sqlite3.connect('electric.db')
                    # Create cursor
                    c = conn.cursor()
                    c.execute("PRAGMA foreign_keys = ON")
                    # Check if area_id exist:
                    c.execute("""SELECT id FROM areas""")
                    results = c.fetchall()
                    area_ids = []
                    for result in results:
                        area_ids.append(result[0])
                    if int(area_ent.get()) not in area_ids:
                        messagebox.showerror(message="Area ID does not exist")
                        sub.destroy()
                        self.update_household_information_with_id(parent)
                    # Insert into table
                    c.execute(
                        f"""UPDATE households 
                        SET owner_name = :owner_name,
                          address = :address,
                          phone_number = :phone_number, 
                          area_id = :area_id
                        WHERE id = {household_id}""",
                        {
                            'owner_name': name_ent.get(),
                            'address': address_ent.get(),
                            'phone_number': phone_number_ent.get(),
                            'area_id': area_ent.get()
                        }
                    )
                    # Commit changes
                    conn.commit()
                    # Close connection
                    conn.close()
                except Error as e:
                    return e

            # Create Submit Button
            submit_btn = tk.Button(sub, text="Update Record to Database", command=submit)
            submit_btn.grid(row=5, column=0, columnspan=2, ipadx=5, ipady=5, pady=5, padx=5)
        except Error as e:
            return e

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.8_3.8.2800.0_x64__qbz5n2kfra8p0\lib\tkinter\__init__.py", line 1892, in __call__
    return self.func(*args)
  File "C:/Users/Administrator/Desktop/Git/projectpp/Electricity.py", line 389, in submit
    self.update_household_information_with_id(parent, id_ent.get())
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.8_3.8.2800.0_x64__qbz5n2kfra8p0\lib\tkinter\__init__.py", line 3043, in get
    return self.tk.call(self._w, 'get')
_tkinter.TclError: invalid command name ".!toplevel.!entry"

基本上，它尝试获取

住户id

，然后调用

住户id

，并将其传递给另一个函数

self。使用同一类中定义的

更新住户信息，如下所示：
    def update_household_information(self, parent):
        try:
            sub = tk.Toplevel(master=parent)
            sub.title(f"Update household")
            sub.resizable(height=False, width=False)

            # Create text entries
            id_ent = tk.Entry(sub, width=30)
            id_ent.grid(row=0, column=1, padx=20)

            # Create text labels
            id_lbl = tk.Label(sub, text="Enter the ID of the household to be updated: ")
            id_lbl.grid(row=0, column=0)

            # Create Submit Function for Database:
            def submit():
                try:
                    # Create the electric.db or connect to it
                    conn = sqlite3.connect('electric.db')
                    # Create cursor
                    c = conn.cursor()
                    c.execute("PRAGMA foreign_keys = ON")
                    # Check if area_id exist:
                    c.execute("""SELECT id FROM households""")
                    results = c.fetchall()
                    household_ids = []
                    for result in results:
                        household_ids.append(result[0])
                    if int(id_ent.get()) not in household_ids:
                        messagebox.showerror(message="Household ID does not exist")
                        sub.destroy()
                        self.update_household_information(parent)
                    else:
                        sub.destroy()
                        self.update_household_information_with_id(parent, id_ent.get())
                except Error as e:
                    return e

            # Create Submit Button
            submit_btn = tk.Button(sub, text="Submit", command=submit)
            submit_btn.grid(row=5, column=0, columnspan=2, ipadx=5, ipady=5, pady=5, padx=5)
        except Error as e:
            return e

    def update_household_information_with_id(self, parent, household_id):
        try:
            sub = tk.Toplevel(master=parent)
            sub.title(f"Update household {household_id}")
            sub.resizable(height=False, width=False)

            # Create text entries
            name_ent = tk.Entry(sub, width=30)
            name_ent.grid(row=1, column=1, padx=20)
            address_ent = tk.Entry(sub, width=30)
            address_ent.grid(row=2, column=1, padx=20)
            phone_number_ent = tk.Entry(sub, width=30)
            phone_number_ent.grid(row=3, column=1, padx=20)
            area_ent = tk.Entry(sub, width=30)
            area_ent.grid(row=4, column=1, padx=20)

            # Create text labels
            id_lbl = tk.Label(sub, text=f"Updating Household {household_id}: ")
            id_lbl.grid(row=0, column=0, columnspan=2)
            name_lbl = tk.Label(sub, text="Owner's name: ")
            name_lbl.grid(row=1, column=0)
            address_lbl = tk.Label(sub, text="Address: ")
            address_lbl.grid(row=2, column=0)
            phone_number_lbl = tk.Label(sub, text="Phone number: ")
            phone_number_lbl.grid(row=3, column=0)
            area_lbl = tk.Label(sub, text="Area: ")
            area_lbl.grid(row=4, column=0)

            # Create Submit Function for Database:
            def submit():
                try:
                    # Create the electric.db or connect to it
                    conn = sqlite3.connect('electric.db')
                    # Create cursor
                    c = conn.cursor()
                    c.execute("PRAGMA foreign_keys = ON")
                    # Check if area_id exist:
                    c.execute("""SELECT id FROM areas""")
                    results = c.fetchall()
                    area_ids = []
                    for result in results:
                        area_ids.append(result[0])
                    if int(area_ent.get()) not in area_ids:
                        messagebox.showerror(message="Area ID does not exist")
                        sub.destroy()
                        self.update_household_information_with_id(parent)
                    # Insert into table
                    c.execute(
                        f"""UPDATE households 
                        SET owner_name = :owner_name,
                          address = :address,
                          phone_number = :phone_number, 
                          area_id = :area_id
                        WHERE id = {household_id}""",
                        {
                            'owner_name': name_ent.get(),
                            'address': address_ent.get(),
                            'phone_number': phone_number_ent.get(),
                            'area_id': area_ent.get()
                        }
                    )
                    # Commit changes
                    conn.commit()
                    # Close connection
                    conn.close()
                except Error as e:
                    return e

            # Create Submit Button
            submit_btn = tk.Button(sub, text="Update Record to Database", command=submit)
            submit_btn.grid(row=5, column=0, columnspan=2, ipadx=5, ipady=5, pady=5, padx=5)
        except Error as e:
            return e

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.8_3.8.2800.0_x64__qbz5n2kfra8p0\lib\tkinter\__init__.py", line 1892, in __call__
    return self.func(*args)
  File "C:/Users/Administrator/Desktop/Git/projectpp/Electricity.py", line 389, in submit
    self.update_household_information_with_id(parent, id_ent.get())
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.8_3.8.2800.0_x64__qbz5n2kfra8p0\lib\tkinter\__init__.py", line 3043, in get
    return self.tk.call(self._w, 'get')
_tkinter.TclError: invalid command name ".!toplevel.!entry"

这将使用提供的id更新住户信息。
但是，当我尝试运行第一个函数时，出现了如下错误：
    def update_household_information(self, parent):
        try:
            sub = tk.Toplevel(master=parent)
            sub.title(f"Update household")
            sub.resizable(height=False, width=False)

            # Create text entries
            id_ent = tk.Entry(sub, width=30)
            id_ent.grid(row=0, column=1, padx=20)

            # Create text labels
            id_lbl = tk.Label(sub, text="Enter the ID of the household to be updated: ")
            id_lbl.grid(row=0, column=0)

            # Create Submit Function for Database:
            def submit():
                try:
                    # Create the electric.db or connect to it
                    conn = sqlite3.connect('electric.db')
                    # Create cursor
                    c = conn.cursor()
                    c.execute("PRAGMA foreign_keys = ON")
                    # Check if area_id exist:
                    c.execute("""SELECT id FROM households""")
                    results = c.fetchall()
                    household_ids = []
                    for result in results:
                        household_ids.append(result[0])
                    if int(id_ent.get()) not in household_ids:
                        messagebox.showerror(message="Household ID does not exist")
                        sub.destroy()
                        self.update_household_information(parent)
                    else:
                        sub.destroy()
                        self.update_household_information_with_id(parent, id_ent.get())
                except Error as e:
                    return e

            # Create Submit Button
            submit_btn = tk.Button(sub, text="Submit", command=submit)
            submit_btn.grid(row=5, column=0, columnspan=2, ipadx=5, ipady=5, pady=5, padx=5)
        except Error as e:
            return e

    def update_household_information_with_id(self, parent, household_id):
        try:
            sub = tk.Toplevel(master=parent)
            sub.title(f"Update household {household_id}")
            sub.resizable(height=False, width=False)

            # Create text entries
            name_ent = tk.Entry(sub, width=30)
            name_ent.grid(row=1, column=1, padx=20)
            address_ent = tk.Entry(sub, width=30)
            address_ent.grid(row=2, column=1, padx=20)
            phone_number_ent = tk.Entry(sub, width=30)
            phone_number_ent.grid(row=3, column=1, padx=20)
            area_ent = tk.Entry(sub, width=30)
            area_ent.grid(row=4, column=1, padx=20)

            # Create text labels
            id_lbl = tk.Label(sub, text=f"Updating Household {household_id}: ")
            id_lbl.grid(row=0, column=0, columnspan=2)
            name_lbl = tk.Label(sub, text="Owner's name: ")
            name_lbl.grid(row=1, column=0)
            address_lbl = tk.Label(sub, text="Address: ")
            address_lbl.grid(row=2, column=0)
            phone_number_lbl = tk.Label(sub, text="Phone number: ")
            phone_number_lbl.grid(row=3, column=0)
            area_lbl = tk.Label(sub, text="Area: ")
            area_lbl.grid(row=4, column=0)

            # Create Submit Function for Database:
            def submit():
                try:
                    # Create the electric.db or connect to it
                    conn = sqlite3.connect('electric.db')
                    # Create cursor
                    c = conn.cursor()
                    c.execute("PRAGMA foreign_keys = ON")
                    # Check if area_id exist:
                    c.execute("""SELECT id FROM areas""")
                    results = c.fetchall()
                    area_ids = []
                    for result in results:
                        area_ids.append(result[0])
                    if int(area_ent.get()) not in area_ids:
                        messagebox.showerror(message="Area ID does not exist")
                        sub.destroy()
                        self.update_household_information_with_id(parent)
                    # Insert into table
                    c.execute(
                        f"""UPDATE households 
                        SET owner_name = :owner_name,
                          address = :address,
                          phone_number = :phone_number, 
                          area_id = :area_id
                        WHERE id = {household_id}""",
                        {
                            'owner_name': name_ent.get(),
                            'address': address_ent.get(),
                            'phone_number': phone_number_ent.get(),
                            'area_id': area_ent.get()
                        }
                    )
                    # Commit changes
                    conn.commit()
                    # Close connection
                    conn.close()
                except Error as e:
                    return e

            # Create Submit Button
            submit_btn = tk.Button(sub, text="Update Record to Database", command=submit)
            submit_btn.grid(row=5, column=0, columnspan=2, ipadx=5, ipady=5, pady=5, padx=5)
        except Error as e:
            return e

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.8_3.8.2800.0_x64__qbz5n2kfra8p0\lib\tkinter\__init__.py", line 1892, in __call__
    return self.func(*args)
  File "C:/Users/Administrator/Desktop/Git/projectpp/Electricity.py", line 389, in submit
    self.update_household_information_with_id(parent, id_ent.get())
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.8_3.8.2800.0_x64__qbz5n2kfra8p0\lib\tkinter\__init__.py", line 3043, in get
    return self.tk.call(self._w, 'get')
_tkinter.TclError: invalid command name ".!toplevel.!entry"

你能告诉我为什么会出现这个错误以及如何修复它吗？
这个错误要么意味着你破坏了这个小部件，要么是在Tk
的不同实例中创建的。如果没有一个我们可以运行的合适的程序，就很难更加具体。您尝试获取id\u ent
，它是id\u ent=tk.Entry（sub..）
因此它是sub=tk.Toplevel（master=parent）
的子级，但在执行sub.destroy（）之前有一行
-因此sub
不再存在，它还删除了它的子项，如id\u ent
。您必须在sub.destroy（）之前获取此值id\u ent.get（）