【python实践】用tkinter写计算器的GUI并实装功能

 

import tkinter as tk
from tkinter import messagebox


def btn_click(value):
    """按钮点击事件处理"""
    if value == '=':
        try:
            result = eval(entry.get())
            entry.delete(0, tk.END)
            entry.insert(tk.END, str(result))
        except ZeroDivisionError:
            messagebox.showerror(" 错误", "除数不能为零！")
            entry.delete(0, tk.END)
        except Exception as e:
            messagebox.showerror(" 错误", "无效表达式")
            entry.delete(0, tk.END)
    elif value == 'C':
        entry.delete(0, tk.END)  # 清空输入框
    elif value == '←':
        entry.delete(len(entry.get()) - 1)  # 删除最后一个字符
    else:
        entry.insert(tk.END, value)  # 追加输入内容


# 创建主窗口
root = tk.Tk()
root.title(" 简易计算器")
root.geometry("300x400")
root.resizable(0, 0)  # 禁止调整窗口大小

# 输入框
entry = tk.Entry(root, font=('Arial', 20), justify='right', bg='#f0f0f0')
entry.grid(row=0, column=0, columnspan=4, sticky='nsew', padx=5, pady=5)

# 按钮布局
buttons = [
    ('C', '←', '%', '/'),
    ('7', '8', '9', '*'),
    ('4', '5', '6', '-'),
    ('1', '2', '3', '+'),
    ('00', '0', '.', '=')
]

# 生成按钮
for row_idx, row in enumerate(buttons, start=1):
    for col_idx, text in enumerate(row):
        btn = tk.Button(root, text=text, font=('Arial', 16),
                        command=lambda t=text: btn_click(t),
                        bg='#e6e6e6', activebackground='#d9d9d9')
        btn.grid(row=row_idx, column=col_idx, sticky='nsew', padx=2, pady=2)

        # 特殊按钮颜色设置
        if text in ['=', '+', '-', '*', '/']:
            btn.config(bg='#ff9933', activebackground='#cc7a00')
        elif text in ['C', '←']:
            btn.config(bg='#ff6666', activebackground='#cc0000')

# 网格布局权重设置
for i in range(5):
    root.grid_rowconfigure(i, weight=1)
for i in range(4):
    root.grid_columnconfigure(i, weight=1)

root.mainloop()