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今天小編給大家分享一下怎么用python制作簡單計算器功能的相關(guān)知識點,內(nèi)容詳細,邏輯清晰,相信大部分人都還太了解這方面的知識,所以分享這篇文章給大家參考一下,希望大家閱讀完這篇文章后有所收獲,下面我們一起來了解一下吧。
效果如圖:
主要思路:
用列表保存按下的鍵,按下等于,轉(zhuǎn)換為字符串,利用內(nèi)置函數(shù)eval計算字符串的值。
代碼:
from tkinter import * W = 280 #窗口寬度 H = 460 #窗口高度 process_H = 110 #顯示運算過程的標(biāo)簽高度 result_H = 50 #顯示運算結(jié)果的標(biāo)簽高度 msFont = '微軟雅黑' #字體 fontSize = 20 #字體大小 btnBoderWidth = 0.5 #邊框?qū)挾? btnColor = '#4F4F4F' #按鈕顏色 btnWidth = 70 #按鈕寬度 btnHeight = 60 #按鈕高度 mainWindows = Tk() mainWindows.title('計算器') mainWindows.minsize(W,H) str_process = StringVar() str_process.set("") str_result = StringVar() str_result.set("0") process = Label(mainWindows,font=(msFont,fontSize),bg='orange',anchor='se',wraplength='280',textvariable=str_process) process.place(width=W,height=process_H) #顯示運算過程的標(biāo)簽 result = Label(mainWindows,font=(msFont,fontSize+10),bg='orange',anchor='se',textvariable=str_result) result.place(y=process_H,width=W,height=result_H) #顯示運算結(jié)果的標(biāo)簽 button_AC = Button(mainWindows,font=(msFont,fontSize),text='AC',fg='orange',bd=btnBoderWidth,command=lambda :clickAC()) button_AC.place(x=0,y=process_H+result_H,width=btnWidth,height=btnHeight) button_back = Button(mainWindows,font=(msFont,fontSize),text='←',fg=btnColor,bd=btnBoderWidth,command=lambda :clickBack()) button_back.place(x=btnWidth,y=process_H+result_H,width=btnWidth,height=btnHeight) button_div = Button(mainWindows,font=(msFont,fontSize),text='÷',fg=btnColor,bd=btnBoderWidth,command=lambda :clickOper('/')) button_div.place(x=btnWidth*2,y=process_H+result_H,width=btnWidth,height=btnHeight) button_mul = Button(mainWindows,font=(msFont,fontSize),text='×',fg=btnColor,bd=btnBoderWidth,command=lambda :clickOper('*')) button_mul.place(x=btnWidth*3,y=process_H+result_H,width=btnWidth,height=btnHeight) button_7 = Button(mainWindows,font=(msFont,fontSize),text='7',fg=btnColor,bd=btnBoderWidth,command=lambda :clickNum('7')) button_7.place(x=0,y=process_H+result_H+btnHeight,width=btnWidth,height=btnHeight) button_8 = Button(mainWindows,font=(msFont,fontSize),text='8',fg=btnColor,bd=btnBoderWidth,command=lambda :clickNum('8')) button_8.place(x=btnWidth,y=process_H+result_H+btnHeight,width=btnWidth,height=btnHeight) button_9 = Button(mainWindows,font=(msFont,fontSize),text='9',fg=btnColor,bd=btnBoderWidth,command=lambda :clickNum('9')) button_9.place(x=btnWidth*2,y=process_H+result_H+btnHeight,width=btnWidth,height=btnHeight) button_minus = Button(mainWindows,font=(msFont,fontSize),text='-',fg=btnColor,bd=btnBoderWidth,command=lambda :clickOper('-')) button_minus.place(x=btnWidth*3,y=process_H+result_H+btnHeight,width=btnWidth,height=btnHeight) button_4 = Button(mainWindows,font=(msFont,fontSize),text='4',fg=btnColor,bd=btnBoderWidth,command=lambda :clickNum('4')) button_4.place(x=0,y=process_H+result_H+btnHeight*2,width=btnWidth,height=btnHeight) button_5 = Button(mainWindows,font=(msFont,fontSize),text='5',fg=btnColor,bd=btnBoderWidth,command=lambda :clickNum('5')) button_5.place(x=btnWidth,y=process_H+result_H+btnHeight*2,width=btnWidth,height=btnHeight) button_6 = Button(mainWindows,font=(msFont,fontSize),text='6',fg=btnColor,bd=btnBoderWidth,command=lambda :clickNum('6')) button_6.place(x=btnWidth*2,y=process_H+result_H+btnHeight*2,width=btnWidth,height=btnHeight) button_add = Button(mainWindows,font=(msFont,fontSize),text='+',fg=btnColor,bd=btnBoderWidth,command=lambda :clickOper('+')) button_add.place(x=btnWidth*3,y=process_H+result_H+btnHeight*2,width=btnWidth,height=btnHeight) button_1 = Button(mainWindows,font=(msFont,fontSize),text='1',fg=btnColor,bd=btnBoderWidth,command=lambda :clickNum('1')) button_1.place(x=0,y=process_H+result_H+btnHeight*3,width=btnWidth,height=btnHeight) button_2 = Button(mainWindows,font=(msFont,fontSize),text='2',fg=btnColor,bd=btnBoderWidth,command=lambda :clickNum('2')) button_2.place(x=btnWidth,y=process_H+result_H+btnHeight*3,width=btnWidth,height=btnHeight) button_3 = Button(mainWindows,font=(msFont,fontSize),text='3',fg=btnColor,bd=btnBoderWidth,command=lambda :clickNum('3')) button_3.place(x=btnWidth*2,y=process_H+result_H+btnHeight*3,width=btnWidth,height=btnHeight) button_equal = Button(mainWindows,font=(msFont,fontSize),text='=',bg='orange',fg=btnColor,bd=btnBoderWidth,command=lambda :clickEqual()) button_equal.place(x=btnWidth*3,y=process_H+result_H+btnHeight*3,width=btnWidth,height=btnHeight*2) button_percent = Button(mainWindows,font=(msFont,fontSize),text='%',fg=btnColor,bd=btnBoderWidth,command=lambda :clickOper("%")) button_percent.place(x=0,y=process_H+result_H+btnHeight*4,width=btnWidth,height=btnHeight) button_0 = Button(mainWindows,font=(msFont,fontSize),text='0',fg=btnColor,bd=btnBoderWidth,command=lambda :clickNum('0')) button_0.place(x=btnWidth,y=process_H+result_H+btnHeight*4,width=btnWidth,height=btnHeight) button_point = Button(mainWindows,font=(msFont,fontSize),text='.',fg=btnColor,bd=btnBoderWidth,command=lambda :clickPoint()) button_point.place(x=btnWidth*2,y=process_H+result_H+btnHeight*4,width=btnWidth,height=btnHeight) process_list = [] s_result = "" isNum = [False] #上一位按下的是否是數(shù)字 point = [True] #小數(shù)點使用情況 def clickNum(num): #按下數(shù)字 isNum.append(True) point.append(point[-1]) #按下數(shù)字,小數(shù)點的標(biāo)志不變 process_list.append(num) s_process = "".join(process_list) str_process.set(s_process) def clickOper(sign):#按下運算符 global isNum,point if isNum[-1]: process_list.append(sign) isNum.append(False) point.append(True) #按下運算符,小數(shù)點標(biāo)志為可以按下小數(shù)點 else: process_list.pop() process_list.append(sign) s_process = "".join(process_list) str_process.set(s_process) def clickEqual():#按下等于 global s_result s_process = "".join(process_list) s_result = eval(s_process) s_result = str(s_result)[0:11] #結(jié)果只顯示11位 str_process.set(s_process) str_result.set(s_result) def clickAC():#按下清除 global s_result,isNum,point s_result = "0" isNum = [False] #狀態(tài)回到初始時候 point = [True] process_list.clear() str_result.set(s_result) str_process.set("") def clickBack(): #按下退格鍵 global point, isNum if len(process_list) > 0: isNum.pop(-1) #刪除最后一位的狀態(tài) point.pop(-1) process_list.pop() s_process = "".join(process_list) str_process.set(s_process) def clickPoint():#按下小數(shù)點 global point,isNum if isNum[-1] and point[-1]: process_list.append(".") s_process = "".join(process_list) str_process.set(s_process) isNum.append(False) point.append(False) mainWindows.mainloop()
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