初中python项目化实例
以下是一个简单的初中Python项目化实例，可以帮助学生掌握Python编程的基本概念和技能：
python编程入门试题
项目名称：计算器
目标：创建一个简单的计算器程序，可以进行加、减、乘、除运算。
步骤：
1. 导入需要的库：
```python
import tkinter as tk
from tkinter import messagebox
```
2. 创建主窗口：
```python
root = tk.Tk()
root.title("计算器")
```
3. 创建数字按钮和运算符按钮的函数：
```python
def button_click(number):
    number_text = str(number)
    if operation_text == "":
        entry_text = number_text
    else:
        entry_text = entry_text + number_text
button_0 = tk.Button(root, text="0", command=lambda: button_click(0))
button_1 = tk.Button(root, text="1", command=lambda: button_click(1))
button_2 = tk.Button(root, text="2", command=lambda: button_click(2))
button_3 = tk.Button(root, text="3", command=lambda: button_click(3))
button_4 = tk.Button(root, text="4", command=lambda: button_click(4))
button_5 = tk.Button(root, text="5", command=lambda: button_click(5))
button_6 = tk.Button(root, text="6", command=lambda: button_click(6))
button_7 = tk.Button(root, text="7", command=lambda: button_click(7))
button_8 = tk.Button(root, text="8", command=lambda: button_click(8))
button_9 = tk.Button(root, text="9", command=lambda: button_click(9))
button_add = tk.Button(root, text="+", command=lambda: operation("add"))
button_sub = tk.Button(root, text="-", command=lambda: operation("sub"))
button_mul = tk.Button(root, text="*", command=lambda: operation("mul"))
button_div = tk.Button(root, text="/", command=lambda: operation("div"))
```
4. 创建计算结果显示的文本框和清空按钮：
```python
entry = tk.Entry(root)
entry.pack()
result_text = ""
entry.bind("<Return>", lambda event: operation_result())
clear_button = tk.Button(root, text="Clear", command=lambda: clear())
clear_button.pack()
```
5. 创建计算结果和清空的函数：
```python
def operation_result():
    global operation_text, entry_text, result_text
    if operation_text == "":
        result_text = entry_text + " = " + str(eval(entry_text))
    else:
        result_text = entry_text + operation_text + str(eval(entry_text + operation_text)) + " = " + str(eval(entry_text + operation_text + operation_text))
    messagebox.showinfo("结果", result_text)
def clear():
    global operation_text, entry_text, result_text
    entry.delete(0, tk.END)
    operation_text = ""
    entry_text = ""
    result_text = ""
```

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