使用 Python 实现一个简单的计算器

好的，以下是一个简单的 Python 计算器的实现：

def calculator():
    num1 = float(input("请输入第一个数字: "))
    operator = input("请输入运算符 (+, -, *, /): ")
    num2 = float(input("请输入第二个数字: "))

    if operator == "+":
        print(num1 + num2)
    elif operator == "-":
        print(num1 - num2)
    elif operator == "*":
        print(num1 * num2)
    elif operator == "/":
        print(num1 / num2)
    else:
        print("无效的运算符")

calculator()

希望这个简单的计算器能够帮助你！

相关问题

用python制作一个简易计算器

好的，以下是一个简易的计算器的Python代码示例：

# 定义函数，实现加、减、乘、除四种基本运算
def add(x, y):
    return x + y

def subtract(x, y):
    return x - y

def multiply(x, y):
    return x * y

def divide(x, y):
    return x / y

# 输入两个数字和运算符
num1 = float(input("请输入第一个数字: "))
num2 = float(input("请输入第二个数字: "))
operator = input("请选择运算符（+、-、*、/）: ")

# 根据运算符调用相应的函数进行运算
if operator == "+":
    print(num1, "+", num2, "=", add(num1, num2))
elif operator == "-":
    print(num1, "-", num2, "=", subtract(num1, num2))
elif operator == "*":
    print(num1, "*", num2, "=", multiply(num1, num2))
elif operator == "/":
    print(num1, "/", num2, "=", divide(num1, num2))
else:
    print("输入错误，请重新运行程序并输入正确的运算符。")

运行程序后，输入两个数字和运算符，即可得到计算结果。注意，这个计算器只能进行简单的四则运算，不能处理复杂的表达式和函数。

Python Tkinter实现一个计算器

好的，以下是一个简单的 Python Tkinter 实现计算器的示例代码，您可以参考：

import tkinter as tk

class Calculator:
    def __init__(self):
        self.current = ""
        self.result = 0
        self.operator = ""
        self.reset = False

    def add_digit(self, digit):
        if self.reset:
            self.clear()
        self.current += str(digit)

    def add_decimal(self):
        if self.reset:
            self.clear()
        if "." not in self.current:
            self.current += "."

    def add_operator(self, operator):
        if self.reset:
            self.operator = operator
            self.reset = False
        else:
            self.calculate()
            self.operator = operator
            self.result = float(self.current)
            self.current = ""

    def calculate(self):
        if self.operator == "+":
            self.result += float(self.current)
        elif self.operator == "-":
            self.result -= float(self.current)
        elif self.operator == "*":
            self.result *= float(self.current)
        elif self.operator == "/":
            self.result /= float(self.current)
        self.operator = ""
        self.current = str(self.result)
        self.reset = True

    def clear(self):
        self.current = ""
        self.result = 0
        self.operator = ""
        self.reset = False

class CalculatorApp(tk.Frame):
    def __init__(self, parent):
        tk.Frame.__init__(self, parent)
        self.parent = parent

        self.calculator = Calculator()

        self.current_label = tk.Label(self.parent, text="0", font=("Helvetica", 20))
        self.current_label.grid(row=0, column=0, columnspan=4, sticky="nsew")

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

        self.buttons = []
        for i in range(len(buttons)):
            button = tk.Button(self.parent, text=buttons[i], font=("Helvetica", 16), command=lambda x=buttons[i]: self.button_click(x))
            button.grid(row=i//4+1, column=i%4, sticky="nsew")
            self.buttons.append(button)

        self.parent.grid_columnconfigure(0, weight=1)
        self.parent.grid_rowconfigure(0, weight=1)
        for i in range(1, 5):
            self.parent.grid_rowconfigure(i, weight=1)
            self.parent.grid_columnconfigure(i-1, weight=1)

    def button_click(self, button):
        if button in "0123456789":
            self.calculator.add_digit(button)
            self.current_label.configure(text=self.calculator.current)
        elif button == ".":
            self.calculator.add_decimal()
            self.current_label.configure(text=self.calculator.current)
        elif button in "+-*/":
            self.calculator.add_operator(button)
        elif button == "=":
            self.calculator.calculate()
            self.current_label.configure(text=self.calculator.current)
        elif button == "C":
            self.calculator.clear()
            self.current_label.configure(text=self.calculator.current)

if __name__ == "__main__":
    root = tk.Tk()
    root.title("Calculator")
    app = CalculatorApp(root)
    app.grid(sticky="nsew")
    root.grid_columnconfigure(0, weight=1)
    root.grid_rowconfigure(0, weight=1)
    root.mainloop()

在这个示例中，我们创建了一个 Calculator 类来处理所有计算逻辑，并创建了一个 CalculatorApp 类来创建用户界面。在用户界面中添加了一个 Label 来显示当前输入和计算结果，并在每个按钮上绑定一个回调函数来处理用户的输入。当用户按下“等号”时，计算器将计算结果并在屏幕上显示。当用户按下“C”按钮时，计算器将重置并返回默认状态。

您可以运行这个代码来查看它的效果，然后根据您的需求进行修改和扩展。