python tkinter收银台

以下是一个使用Python Tkinter模块编写的简单收银台示例代码：

from tkinter import *

def calculate():
    # 获取输入值
    price = float(price_entry.get())
    quantity = int(quantity_entry.get())
    discount = float(discount_entry.get()) / 100

    # 计算总价和折扣
    total_price = price * quantity
    total_discount = total_price * discount

    # 计算应付和找零
    payable = total_price - total_discount
    paid = float(paid_entry.get())
    change = paid - payable

    # 更新标签
    payable_label.config(text=f"应付: {payable}")
    change_label.config(text=f"找零: {change}")

# 创建主窗口
root = Tk()
root.title("收银台")

# 添加标签和输入框
Label(root, text="单价:").grid(row=0, column=0)
price_entry = Entry(root)
price_entry.grid(row=0, column=1)

Label(root, text="数量:").grid(row=1, column=0)
quantity_entry = Entry(root)
quantity_entry.grid(row=1, column=1)

Label(root, text="折扣(%):").grid(row=2, column=0)
discount_entry = Entry(root)
discount_entry.grid(row=2, column=1)

Label(root, text="实付:").grid(row=3, column=0)
paid_entry = Entry(root)
paid_entry.grid(row=3, column=1)

# 添加计算按钮
Button(root, text="计算", command=calculate).grid(row=4, column=0)

# 添加结果标签
payable_label = Label(root, text="应付: ")
payable_label.grid(row=5, column=0)

change_label = Label(root, text="找零: ")
change_label.grid(row=6, column=0)

# 运行主循环
root.mainloop()

该代码创建了一个简单的收银台GUI界面，用户可以输入单价、数量、折扣和实付金额，单击“计算”按钮后，程序将计算应付和找零，并在窗口中显示结果。