` 当我在交易屏幕中说“清除”时（清除我为输入日期、单位代码等输入的值或名称），它不会清除“单位代码、客户编号和组代码的第一个数字”。我也手动删除不了你能解决这个问题吗？其他工作正常（例如输入日期、客户名称、货币、类型……）。我创建新客户时也无法删除。假设单元代码是 25567，如果我按照“5,2,5,7”的顺序手动删除，那么 6 是唯一剩下的数字，我无法删除 6。
代码：
import tkinter as tk
from tkinter import messagebox
from tkcalendar import DateEntry
`# Define the main application class
class Application(tk.Tk):
def __init__(self):
super().__init__()
self.title("Banking Application")
self.geometry("800x600")
self.current_frame = None
self.transactions = []
self.show_login_screen()
# Method to show the login screen
def show_login_screen(self):
if self.current_frame is not None:
self.current_frame.destroy()
self.current_frame = LoginFrame(self)
self.current_frame.pack(fill="both", expand=True)
# Method to show the menu screen
def show_menu_screen(self):
if self.current_frame is not None:
self.current_frame.destroy()
self.current_frame = MenuFrame(self)
self.current_frame.pack(fill="both", expand=True)
# Method to show the transaction info screen
def show_transaction_info_screen(self):
if self.current_frame is not None:
self.current_frame.destroy()
self.current_frame = TransactionInfoFrame(self)
self.current_frame.pack(fill="both", expand=True)
# Method to show the new customer screen
def show_new_customer_screen(self):
if self.current_frame is not None:
self.current_frame.destroy()
self.current_frame = NewCustomerFrame(self)
self.current_frame.pack(fill="both", expand=True)
# Define the login frame class
class LoginFrame(tk.Frame):
def __init__(self, master):
super().__init__(master)
self.master = master
# Create a frame for the username and password labels and entries
login_frame = tk.Frame(self)
login_frame.pack(pady=20)
# Username label and entry
tk.Label(login_frame, text="Username:").grid(row=0, column=0, padx=10, pady=10)
self.username_entry = tk.Entry(login_frame)
self.username_entry.grid(row=0, column=1, padx=10, pady=10)
# Password label and entry
tk.Label(login_frame, text="Password:").grid(row=1, column=0, padx=10, pady=10)
self.password_entry = tk.Entry(login_frame, show="*")
self.password_entry.grid(row=1, column=1, padx=10, pady=10)
# Submit and Logout buttons
button_frame = tk.Frame(self)
button_frame.pack(pady=20)
tk.Button(button_frame, text="Submit", command=self.login).grid(row=0, column=0, padx=10)
tk.Button(button_frame, text="Logout", command=self.logout).grid(row=0, column=1, padx=10)
# Method to handle login
def login(self):
username = self.username_entry.get()
password = self.password_entry.get()
# Add login validation logic here
if username == "admin" and password == "password": # Example validation
self.master.show_menu_screen()
else:
messagebox.showerror("Login Failed", "Invalid username or password")
# Method to handle logout
def logout(self):
self.master.destroy()
# Define the menu frame class
class MenuFrame(tk.Frame):
def __init__(self, master):
super().__init__(master)
self.master = master
# Menu label and buttons
tk.Label(self, text="Menu").pack(pady=20)
tk.Button(self, text="Transaction Info", command=self.master.show_transaction_info_screen).pack(pady=10)
tk.Button(self, text="New Customer", command=self.master.show_new_customer_screen).pack(pady=10)
# Define the transaction info frame class
class TransactionInfoFrame(tk.Frame):
def __init__(self, master):
super().__init__(master)
self.master = master
# Transaction info label and listbox with scrollbar
tk.Label(self, text="Transaction Info").pack(pady=20)
self.transaction_list_frame = tk.Frame(self)
self.transaction_list_frame.pack(pady=20, fill=tk.BOTH, expand=True)
self.transaction_list_scrollbar = tk.Scrollbar(self.transaction_list_frame)
self.transaction_list_scrollbar.pack(side=tk.RIGHT, fill=tk.Y)
self.transaction_list = tk.Listbox(self.transaction_list_frame, yscrollcommand=self.transaction_list_scrollbar.set)
self.transaction_list.pack(side=tk.LEFT, fill=tk.BOTH, expand=True)
self.transaction_list_scrollbar.config(command=self.transaction_list.yview)
self.refresh_transactions()
# Update, Cancel, and Exit buttons
tk.Button(self, text="Update", command=self.update_transaction).pack(pady=10)
tk.Button(self, text="Cancel", command=self.cancel_transaction).pack(pady=10)
tk.Button(self, text="Exit", command=self.master.show_menu_screen).pack(pady=10)
# Method to refresh the transaction list
def refresh_transactions(self):
self.transaction_list.delete(0, tk.END)
for transaction in self.master.transactions:
self.transaction_list.insert(tk.END, transaction["Customer Name"])
# Method to handle update transaction
def update_transaction(self):
selected_index = self.transaction_list.curselection()
if selected_index:
selected_transaction = self.master.transactions[selected_index[0]]
self.master.show_new_customer_screen()
self.master.current_frame.fill_form(selected_transaction, selected_index[0])
# Method to handle cancel transaction
def cancel_transaction(self):
selected_index = self.transaction_list.curselection()
if selected_index:
del self.master.transactions[selected_index[0]]
self.refresh_transactions()
# Define the new customer frame class
class NewCustomerFrame(tk.Frame):
def __init__(self, master):
super().__init__(master)
self.master = master
self.edit_index = None
self.create_form()
# Submit, Clear, Back, Delete, and Exit buttons
tk.Button(self, text="Submit", command=self.submit_customer).pack(pady=10)
tk.Button(self, text="Clear", command=self.clear_form).pack(pady=10)
tk.Button(self, text="Back", command=self.master.show_menu_screen).pack(pady=10)
tk.Button(self, text="Delete", command=self.delete_customer).pack(pady=10)
tk.Button(self, text="Exit", command=self.master.show_menu_screen).pack(pady=10)
# Method to create the new customer form with scrollbar
def create_form(self):
form_frame = tk.Frame(self)
form_frame.pack(pady=20, fill=tk.BOTH, expand=True)
form_canvas = tk.Canvas(form_frame)
form_canvas.pack(side=tk.LEFT, fill=tk.BOTH, expand=True)
scrollbar = tk.Scrollbar(form_frame, orient="vertical", command=form_canvas.yview)
scrollbar.pack(side=tk.RIGHT, fill=tk.Y)
form_scrollable_frame = tk.Frame(form_canvas)
form_scrollable_frame.bind(
"<Configure>",
lambda e: form_canvas.configure(
scrollregion=form_canvas.bbox("all")
)
)
form_canvas.create_window((0, 0), window=form_scrollable_frame, anchor="nw")
form_canvas.configure(yscrollcommand=scrollbar.set)
form_scrollable_frame.bind_all("<MouseWheel>", lambda event: form_canvas.yview_scroll(int(-1*(event.delta/120)), "units"))
fields = [
("Entry Date", "Enter the date the customer was added."),
("Unit Code", "Enter the branch number (max 3 digits)."),
("Customer Number", "Enter the customer number (max 5 digits)."),
("Group Code", "Enter the group code (max 1 digit)."),
("Customer Name", "Enter the customer's full name."),
("Currency Type", "Enter the type of currency (e.g., USD, EUR)."),
("Interest Rate", "Enter the interest rate."),
("Minimum Amount", "Enter the minimum amount."),
("Maximum Amount", "Enter the maximum amount."),
("Balance", "Enter the balance."),
("Maturity Start", "Enter the start date of the maturity period."),
("Maturity End", "Enter the end date of the maturity period."),
("Number of Days", "Calculated number of days between maturity start and end."),
("Pricing Authority", "Enter the pricing authority.")
]
self.entries = {}
for field, instruction in fields:
frame = tk.Frame(form_scrollable_frame)
frame.pack(fill=tk.X, padx=5, pady=5)
tk.Label(frame, text=field).pack(side=tk.LEFT)
if "Date" in field or "Maturity" in field:
entry = DateEntry(frame, date_pattern='dd/mm/yyyy')
else:
entry = tk.Entry(frame)
if "Customer Number" in field:
entry.config(validate="key", validatecommand=(frame.register(self.validate_customer_number), '%P'))
elif "Unit Code" in field:
entry.config(validate="key", validatecommand=(frame.register(self.validate_unit_code), '%P'))
elif "Group Code" in field:
entry.config(validate="key", validatecommand=(frame.register(self.validate_group_code), '%P'))
entry.pack(side=tk.RIGHT, fill=tk.X, expand=True)
tk.Label(frame, text=instruction, fg="grey").pack(side=tk.RIGHT, padx=5)
self.entries[field] = entry
def validate_customer_number(self, value):
return value.isdigit() and len(value) <= 5
def validate_unit_code(self, value):
return value.isdigit() and len(value) <= 3
def validate_group_code(self, value):
return value.isdigit() and len(value) <= 1
# Method to handle submit customer
def submit_customer(self):
customer_data = {field: entry.get() for field, entry in self.entries.items()}
if self.edit_index is not None:
self.master.transactions[self.edit_index] = customer_data
self.edit_index = None
else:
self.master.transactions.append(customer_data)
messagebox.showinfo("Submitted", "Customer information has been submitted")
print(customer_data)
self.master.show_menu_screen()
# Method to fill the form with existing data
def fill_form(self, data, index):
self.edit_index = index
for field, value in data.items():
self.entries[field].delete(0, tk.END)
self.entries[field].insert(0, value)
# Method to clear the form
def clear_form(self):
for entry in self.entries.values():
entry.delete(0, tk.END)
# Method to delete the customer
def delete_customer(self):
if self.edit_index is not None:
del self.master.transactions[self.edit_index]
self.edit_index = None
messagebox.showinfo("Deleted", "Customer information has been deleted")
self.clear_form()
self.master.show_menu_screen()
else:
messagebox.showerror("Error", "No customer selected to delete")
# Main application entry point
if __name__ == "__main__":
app = Application()
app.mainloop()
问题出在这三个条目的验证函数上，您对所有条目都使用这个表达式
value.isdigit() and len(value) <= 5
现在，当您按下清除按钮时，实际传递的键是一个空字符串
"" def validate_customer_number(self, value):
return (value.isdigit() and len(value) <= 5) or not value
def validate_unit_code(self, value):
return (value.isdigit() and len(value) <= 3) or not value
def validate_group_code(self, value):
return (value.isdigit() and len(value) <= 1) or not value
添加
or not value