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计算器.py

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+import tkinter as tk
+from tkinter import messagebox
+import re
+#import math
+from math import *
+
+# 创建主窗口
+window = tk.Tk()
+# 设置窗口大小和位置
+window.geometry('340x240+600+300')
+# 不允许改变窗口大小
+window.resizable(False, False)
+# 设置窗口标题
+window.title('计算器')
+# 背景颜色
+window.config(background="blue")
+# 自动刷新字符串变量，可用 set 和 get 方法进行传值和取值
+content_var = tk.StringVar(window, '')
+# 创建单行文本框
+content_entry = tk.Entry(window, textvariable=content_var)
+# 设置文本框为只读
+content_entry['state'] = 'readonly'
+# 设置文本框坐标及宽高
+content_entry.place(x=20, y=10, width=300, height=30)
+# 按钮显示内容
+value = ['e^x','√', 'π', '%', '//',
+         '**','⌫', '(', ')', '/',
+         'x!','7', '8', '9', '*',
+         'x³','4', '5', '6', '-',
+         'x²','1', '2', '3', '+',
+         'C','+/-', '0', '.', '=']
+index = 0
+# 将按钮进行 6x5 放置
+for row in range(6):
+    for col in range(5):
+        d = value[index]
+        index += 1
+        if (row==1 and (col==1 or col==2 or col==3)):
+            btn_digit = tk.Button(window, text=d, command=lambda x=d: onclick(x), bg="gray", fg="black")
+            btn_digit.place(x=20 + col * 62, y=50 + row * 30, width=50, height=20)
+        elif (row==2 and (col==1 or col==2 or col==3)):
+            btn_digit = tk.Button(window, text=d, command=lambda x=d: onclick(x), bg="LightPink", fg="red")
+            btn_digit.place(x=20 + col * 62, y=50 + row * 30, width=50, height=20)
+        elif (row==3 and (col==1 or col==2 or col==3)):
+            btn_digit = tk.Button(window, text=d, command=lambda x=d: onclick(x), bg="LightPink", fg="red")
+            btn_digit.place(x=20 + col * 62, y=50 + row * 30, width=50, height=20)
+        elif (row==4 and (col==1 or col==2 or col==3)):
+            btn_digit = tk.Button(window, text=d, command=lambda x=d: onclick(x), bg="LightPink", fg="red")
+            btn_digit.place(x=20 + col * 62, y=50 + row * 30, width=50, height=20)
+        elif (row==5 and col==2):
+            btn_digit = tk.Button(window, text=d, command=lambda x=d: onclick(x), bg="LightPink", fg="red")
+            btn_digit.place(x=20 + col * 62, y=50 + row * 30, width=50, height=20)
+        elif (row==5 and col!=2):
+            btn_digit = tk.Button(window, text=d, command=lambda x=d: onclick(x), bg="SpringGreen", fg="red")
+            btn_digit.place(x=20 + col * 62, y=50 + row * 30, width=50, height=20)
+        else:
+            btn_digit = tk.Button(window, text=d, command=lambda x=d: onclick(x), bg="DeepSkyBlue", fg="purple")
+            btn_digit.place(x=20 + col * 62, y=50 + row * 30, width=50, height=20)
+
+# 点击事件
+def onclick(key):
+    # 运算符
+    operation = ('+', '-', '*', '/', '**', '//', '%')
+    # 获取文本框中的内容
+    content = content_var.get()
+    # 如果已有内容是以小数点开头的，在前面加 0
+    if content.startswith('.'):
+        content = '0' + content  # 字符串可以直接用+来增加字符
+    # 根据不同的按钮作出不同的反应
+    if key in '0123456789':
+        # 按下 0-9 在 content 中追加
+        content += key
+    elif key == '.':
+        # 将 content 从 +-*/ 这些字符的地方分割开来
+        last_part = re.split(r'[+\-*/]', content)[-1]
+        if '.' in last_part:
+            # 信息提示对话框
+            tk.messagebox.showerror('Error', 'Repeated decimal point')
+            return
+        else:
+            content += key
+    elif key == 'C':
+        # 清除文本框
+        content = ''
+    elif key == '=':
+        try:
+            # 对输入的表达式求值
+            content = str(eval(content.replace("π", str(pi))))
+            content = str(eval(content))
+        except ZeroDivisionError:
+            tk.messagebox.showerror('Error', 'Division by zero is not allowed')
+            return
+        except Exception as e:
+            tk.messagebox.showerror('Error', f'Invalid expression: {e}')
+            return
+    elif key in operation:
+        if content.endswith(operation):
+            tk.messagebox.showerror('Error', 'Consecutive operators not allowed')
+            return
+        content += key
+
+    elif key == '+/-':
+        # 将正负号切换
+        if content.startswith('-'):
+            content = content[1:]
+        else:
+            content = '-' + content
+    elif key in '()':
+        # 直接在内容后面追加括号
+        content += key
+    elif key == '√':
+        # 从 . 处分割存入 n，n 是一个列表
+        n = content.split('.')
+        # 如果列表中所有的都是数字，就是为了检查表达式是不是正确的
+        if all(map(lambda x: x.isdigit(), n)):
+            content = sqrt(eval(content))
+        else:
+            tk.messagebox.showerror('Error', 'Invalid expression')
+            return
+    elif key == 'e^x':
+        # 添加常数e的x次方
+        content = exp(eval(content))
+    elif key == '⌫':
+        # 删除最后一个字符
+        content = content[:-1]
+    elif key == 'x²':
+        # 计算平方
+        try:
+            content = str(float(content) ** 2)
+        except Exception as e:
+            tk.messagebox.showerror('Error', f'Invalid expression: {e}')
+            return
+    elif key == 'x³':
+        # 计算立方
+        try:
+            content = str(float(content) ** 3)
+        except Exception as e:
+            tk.messagebox.showerror('Error', f'Invalid expression: {e}')
+            return
+    elif key == 'x!':
+        # 计算阶乘
+        try:
+            num = int(content)
+            if num < 0:
+                tk.messagebox.showerror('Error', 'Please enter a non-negative integer')
+                return
+            content = str(factorial(num))
+        except ValueError:
+            tk.messagebox.showerror('Error', 'Please enter a non-negative integer')
+            return
+        except Exception as e:
+            tk.messagebox.showerror('Error', f'Invalid expression: {e}')
+            return
+    elif key == 'π':
+        # 添加常数π
+        content += 'π'
+
+    # 将结果显示到文本框中
+    content_var.set(content)
+
+# 运行主循环
+window.mainloop()
+
+#x = 2 + 9 * ((3*12) - 8) // 10
+#print(x)