Python实现一个简单的计算器

简单版本

  使用 Python 的 Tkinter 模块来实现一个简单的图形化计算器。以下是一个基本的示例代码

示例效果

代码源码

import tkinter as tk

def button_click(number):
    current = entry.get()
    entry.delete(0, tk.END)
    entry.insert(0, current + str(number))

def button_clear():
    entry.delete(0, tk.END)

def button_equal():
    result = eval(entry.get())
    entry.delete(0, tk.END)
    entry.insert(0, result)

root = tk.Tk()
root.title("简易计算器")

entry = tk.Entry(root, width=35, borderwidth=5)
entry.grid(row=0, column=0, columnspan=4, padx=10, pady=10)

buttons = [
    ("7", 1, 0), ("8", 1, 1), ("9", 1, 2), ("/", 1, 3),
    ("4", 2, 0), ("5", 2, 1), ("6", 2, 2), ("*", 2, 3),
    ("1", 3, 0), ("2", 3, 1), ("3", 3, 2), ("-", 3, 3),
    ("0", 4, 0), (".", 4, 1), ("=", 4, 2), ("+", 4, 3)
]

for button_text, row, col in buttons:
    button = tk.Button(root, text=button_text, padx=20, pady=20, command=lambda text=button_text: button_click(text))
    button.grid(row=row, column=col)

clear_button = tk.Button(root, text="清除", padx=61, pady=20, command=button_clear)
clear_button.grid(row=5, column=0, columnspan=2)

equal_button = tk.Button(root, text="=", padx=61, pady=20, command=button_equal)
equal_button.grid(row=5, column=2, columnspan=2)

root.mainloop()

高级版本

  相比于基础版本增加了很多的判断，并且对UI页面也进行了优化

实现效果

代码源码

import tkinter as tk

def button_click(char):
    if calculated:
        entry.delete(0, tk.END)
        globals()['calculated'] = False
    entry.insert(tk.END, char)

def button_clear():
    entry.delete(0, tk.END)

def button_equal():
    try:
        result = eval(entry.get())
        entry.delete(0, tk.END)
        entry.insert(tk.END, str(result))
        globals()['calculated'] = True
    except:
        entry.delete(0, tk.END)
        entry.insert(tk.END, "Error")
        globals()['calculated'] = False

calculated = False

root = tk.Tk()
root.title("简易计算器")

entry = tk.Entry(root, width=35, borderwidth=5)
entry.grid(row=0, column=0, columnspan=4, padx=10, pady=10)

# 定义按钮布局和样式
buttons = [
    ("7", 1, 0), ("8", 1, 1), ("9", 1, 2), ("+", 1, 3),
    ("4", 2, 0), ("5", 2, 1), ("6", 2, 2), ("-", 2, 3),
    ("1", 3, 0), ("2", 3, 1), ("3", 3, 2), ("*", 3, 3),
    ("0", 4, 0), ("清除", 4, 1), ("=", 4, 2), ("/", 4, 3)
]

# 创建并放置按钮
for button_text, row, col in buttons:
    if button_text == "=":
        button = tk.Button(root, text=button_text, padx=20, pady=20, font=("Helvetica", 12), bg="lightgray", command=button_equal)
    elif button_text == "清除":
        button = tk.Button(root, text=button_text, padx=20, pady=20, font=("Helvetica", 12), bg="lightgray", command=button_clear)
    else:
        button = tk.Button(root, text=button_text, padx=20, pady=20, font=("Helvetica", 12), bg="lightgray", command=lambda text=button_text: button_click(text))
    button.grid(row=row, column=col, padx=5, pady=5)

root.mainloop()