我使用 tkinter 創(chuàng)建了一個(gè) ATM，它在單擊余額按鈕時(shí)顯示當(dāng)前余額，它添加了不同類別的存入和提取的錢，這些錢從設(shè)置為 0 的當(dāng)前余額和余額中添加或減去被存儲(chǔ)在class SampleApp(tk.Tk): def __init__(self, *args, **kwargs): tk.Tk.__init__(self, *args, **kwargs) self.shared_data={'Balance':tk.IntVar()}剩余余額會(huì)顯示在屏幕上class BalancePage(tk.Frame): global current_balance controller.shared_data['Balance'].set(current_balance) balance_label=tk.Label(self,textvariable=controller.shared_data['Balance'],font=('orbitron',13),fg='white',bg='#3d3d5c',anchor='w') balance_label.pack(fill='x')我只想在顯示的金額前顯示一個(gè)“$”符號(hào)（即為 0 并且想要 $0）請(qǐng)幫助#WithdrawPageclass WithdrawPage(tk.Frame): def withdraw(amount): global current_balance if amount>current_balance: messagebox.showwarning('WARNING','Not sufficient funds!') else: current_balance -= amount controller.shared_data['Balance'].set(current_balance) controller.show_frame('MenuPage')#DepositPageclass DepositPage(tk.Frame): def deposit_cash(): global current_balance current_balance += int(cash.get()) controller.shared_data['Balance'].set(current_balance) controller.show_frame('MenuPage') cash.set('')
3 回答
千巷貓影
TA貢獻(xiàn)1829條經(jīng)驗(yàn) 獲得超7個(gè)贊
StringVar您可以為textvariableof設(shè)置另一個(gè)balance_label：
balance_label = tk.Label(..., textvariable=self.balance_var,...)
然后在跟蹤回調(diào)中設(shè)置和更新trace()：controller.shared_data['Balance']self.balance_var
self.balance_var.set('$'+str(self.controller.shared_data['Balance'].get()))
由于我沒(méi)有您的代碼的全貌，下面是您的代碼的建議更改：
class BalancePage(tk.Frame):
def __init__(self, parent, controller, *args, **kw):
...
self.controller = controller
self.balance_var = tk.StringVar()
controller.shared_data['Balance'].trace('w', self.on_balance_changed)
balance_label = tk.Label(self, textvariable=self.balance_var, font=('orbitron',13),
fg='white', bg='#3d3d5c', anchor='w')
balance_label.pack(fill='x')
...
def on_balance_changed(self, *args):
self.balance_var.set('$'+str(self.controller.shared_data['Balance'].get()))
慕勒3428872
TA貢獻(xiàn)1848條經(jīng)驗(yàn) 獲得超6個(gè)贊
嘗試balance_label像這樣更改文本變量：
balance_label = tk.Label(self, textvariable="$"+controller.shared_data['Balance'], font=('orbitron', 13), fg='white', bg='#3d3d5c', anchor='w')這應(yīng)該可以解決問(wèn)題。
繁花如伊
TA貢獻(xiàn)2012條經(jīng)驗(yàn) 獲得超12個(gè)贊
$使用此示例通過(guò)將與最終結(jié)果連接起來(lái)來(lái)實(shí)現(xiàn)您要執(zhí)行的操作
print ("$"+ current_balance)或這個(gè)
print ("$", current_balance)添加回答
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