基于Python实现可以进制转换的科学计算器

• 利用Python GUI中的tkinter模块实现Windows简易计算器
• 基于Python实现仿Windows标准计算器

       本人已经做了两个基于Python的计算器项目，有需要的话，请看本文头部。这次基于Python制作一个科学计算器 项目，创建一个科学计算器。

1、科学计算器应包括：计算器界面、0-9数字按键、清零和各功能按键；
2、功能1：二进制、八进制、十进制、十六进制、四种进制可相互切换；
3、功能2：加减乘除基本运算、平方、开方、x^y、 x^3等；
4、功能3：tan、cos、sin、n！、log等

from tkinter import StringVar, Entry, Button
from tkinter import Tk
import  math


class calculator:
    def __init__(self):
        window = Tk()
        window.title('基于TK的科学计算器')
        window.configure(background="white")
        self.string = StringVar()
        entry = Entry(window, textvariable=self.string, )
        entry.grid(row=0, column=0, columnspan=6)
        entry.configure(background="white")
        entry.focus()

        values = ["C", "DEL", "(", ")", "%", "gcd",
                  "sin", "sqrt", "e", "pow", "/", "oct",
                  "cos", "7", "8", "9", "*", "int",
                  "tan", "4", "5", "6", "-", "hex",
                  "pi", "1", "2", "3", "+", "bin",
                  "log", ",", "0", ".", "="]

        text = 1
        i = 0
        row = 1
        col = 0
        for txt in values:
            padx = 10
            pady = 10
            if (i == 6):
                row = 2
                col = 0
            if (i == 12):
                row = 3
                col = 0
            if (i == 18):
                row = 4
                col = 0
            if (i == 24):
                row = 5
                col = 0
            if (i == 30):
                row = 6
                col = 0
            if (txt == '='):
                btn = Button(window, height=2, width=4, padx=50, pady=pady, text=txt,
                             command=lambda txt=txt: self.equals())
                btn.grid(row=row, column=col, columnspan=3, padx=2, pady=2)
                btn.configure(background="yellow")

            elif (txt == 'DEL'):
                btn = Button(window, height=2, width=4, padx=padx, pady=pady, text=txt,
                             command=lambda txt=txt: self.delete())
                btn.grid(row=row, column=col, padx=1, pady=1)
                btn.configure(background="grey")
            elif (txt == 'C'):
                btn = Button(window, height=2, width=4, padx=padx, pady=pady, text=txt,
                             command=lambda txt=txt: self.clearall())
                btn.grid(row=row, column=col, padx=1, pady=1)
                btn.configure(background="red")
            else:
                btn = Button(window, height=2, width=4, padx=padx, pady=pady, text=txt,
                             command=lambda txt=txt: self.addChar(txt))
                btn.grid(row=row, column=col, padx=1, pady=1)
                btn.configure(background="white")

            col = col + 1
            i = i + 1
        window.mainloop()

    def clearall(self):
        self.string.set("")

    def equals(self):
        result = ""
        try:
            result = eval(self.string.get())
            self.string.set(result)
        except:
            result = "无效输入"
        self.string.set(result)

    def addChar(self, char):
        i = ['log', 'sqrt', 'pi', 'sin', 'cos', 'tan', 'e', "gcd", "radians", "degrees", "ceil", "hypot"]
        if char in i:
            self.string.set(self.string.get() + 'math.' + (str(char)))
            print(self.string.get().format(())+"   "+str(char))
        else:
            self.string.set(self.string.get() + (str(char)))
            print(self.string.get() + "  " + str(char))

    def delete(self):
        self.string.set(self.string.get()[0:-1])


calculator()