python編寫計算器，供大家參考，具體內(nèi)容如下

（1）計算器界面如下：

（2）基本滿足了計算器的所有需求，使用時不可鍵盤輸入，只能鼠標(biāo)點擊左鍵才可執(zhí)行。初始時顯示0.0，每次輸入的內(nèi)容存于D:num.txt(啟動程序時自動創(chuàng)建)

（3）' AC ' 記錄清零返回初始 0.0；' delete ' 刪除上一個輸入內(nèi)容；' +/- ' 將正數(shù)為負(fù)數(shù)，負(fù)數(shù)為正數(shù)

（4）對于不同的進(jìn)制數(shù)值系統(tǒng)，小數(shù)的精準(zhǔn)值不同。因此計算機(jī)會出現(xiàn) 0.1+0.2=0.3000000000004 的現(xiàn)象能對數(shù)據(jù)進(jìn)行截斷處理，可以解決問題，但精度喪失。（此計算機(jī)沒有進(jìn)行截斷處理）

import tkinter,osfrom tkinter import *def temp(string):#空白間隔 temp=tkinter.Frame(string,width=20,height=50) temp.pack()flag=0node=0def num_work(): #更新顯示框Lable global flag global node with open('D:num.txt') as f: for length in f: string=length top_work.configure(text=string.strip(’n’)) # 重新設(shè)置標(biāo)簽文本 root.after(500,num_work) # 每隔0.5s調(diào)用函數(shù)num_work自身獲取結(jié)果def num_math_int(num1,num2):#整數(shù)運算 try: if num2[0]==’+’: string=int(num1)+int(num2[1:]) elif num2[0]==’-’: string=int(num1)-int(num2[1:]) elif num2[0]==’x’: string=int(num1)*int(num2[1:]) elif num2[0]==’/’: string=int(num1)/int(num2[1:]) with open('D:num.txt',’a’) as f: f.write(’n’+str(string)+’n’) except: with open('D:num.txt',’a’) as f:f.write(’n錯誤’)def num_math_float(num1,num2):#小數(shù)運算 try: if num2[0]==’+’: string=float(num1)+float(num2[1:]) elif num2[0]==’-’: string=float(num1)-float(num2[1:]) elif num2[0]==’x’: string=float(num1)*float(num2[1:]) elif num2[0]==’/’: string=float(num1)/float(num2[1:]) if flag==0: with open('D:num.txt',’a’) as f:f.write(’n’+str(string)+’n’) else: with open('D:num.txt',’a’) as f:f.write(’n’+str(string)) except: with open('D:num.txt',’a’) as f:f.write(’n錯誤’)def decimal(num): if num.count(’%’)>0: num=num.replace(’%’,’’) num=num.replace(’n’,’’) if num.isnumeric(): num=str(float(num)/100) else: num=num[0]+str(float(num[1:])/100) return num def work(string):#按鍵對應(yīng)的功能 if string.isnumeric(): with open('D:num.txt','a') as file: file.write(string) else: #讀取文件D:num.txt所有內(nèi)容 lists=[] with open('D:num.txt','r') as file: for length in file:lists.append(length) if string==’AC’: with open('D:num.txt','w') as file:file.write(’0.0n’) elif string==’=’: num1=lists[-2] num2=lists[-1] if num1==’n’:#解決末尾為換行的情況num1=lists[-3] #將百分?jǐn)?shù)小數(shù)化 #出現(xiàn)結(jié)果多0.0000000001 num1=decimal(num1) num2=decimal(num2) try: #判斷兩個數(shù)是整數(shù)還是小數(shù)number=int(num1)number=int(num2[1:])num_math_int(num1,num2)#兩個數(shù)進(jìn)行整數(shù)運算 except:num_math_float(num1,num2)#兩個數(shù)進(jìn)行小數(shù)運算 elif string==’.’: if lists[-1].count(’.’)==0:#判斷結(jié)尾是否有小數(shù)點，沒有寫入否則報錯with open('D:num.txt','a') as file: file.write(string) else:with open('D:num.txt','a') as file: file.write(’n錯誤’) elif string==’+/-’: if lists[-1].count(’-’)==0:#-+為-if lists[-1].count(’+’)==1: lists[-1]=lists[-1].replace(’+’,’’)lists[-1]=’-’+lists[-1] else: #--為+lists[-1]=lists[-1].replace(’-’,’+’) #更新文件 with open('D:num.txt','w') as file:pass for length in lists:with open('D:num.txt','a') as file: file.write(length) elif string==’delete’: number=lists[-1] lists[-1]=number[0:(len(number)-1)]#刪除一位 #更新文件 with open('D:num.txt','w') as file:pass for length in lists:with open('D:num.txt','a') as file: file.write(length) elif string==’%’: if lists[-1].endswith('%')==False:with open('D:num.txt','a') as file: file.write(string) else:with open('D:num.txt','a') as file: file.write(’n錯誤’) else: with open('D:num.txt','a') as file:file.write(’n’+string) def run():#計算器顯示界面主體 if os.path.exists('D:num.txt')==False: with open('D:num.txt',’w’) as f: f.write(’0.0n’)global root#定義全局變量root,方便Label更新 root=tkinter.Tk() root.title('計算器') #x = root.winfo_screenwidth() #獲取當(dāng)前屏幕的寬 #y = root.winfo_screenheight() #獲取當(dāng)前屏幕的高 #print(((x-500)//2),((y-600)//2))#為居中提供的參數(shù) root.geometry(’400x500+760+290’)#主體長400，高500，居中 top=tkinter.Frame(root,width=20,height=50) top.pack() global top_work#定義全局變量root temp(top)#空白間隔 #計算器顯示框 top_work=tkinter.Label(top,text=’’,justify=’left’,relief=SUNKEN,bd=10,bg=’white’,width=40) top_work.pack(side=’bottom’)#計算器顯示框（位置居下） num_work() temp(root)#空白間隔 number=tkinter.Frame(root)#成放計算機(jī)鍵盤的容器 number.pack() #所有按鍵，AC鍵為事例 numberAC=tkinter.Button(number,text='AC',width=10,command=lambda : work(’AC’)).grid(row=0,column=0) #左鍵點擊，執(zhí)行函數(shù)work #按鍵位置（0,0） numberdelete=tkinter.Button(number,text='delete',width=10,command=lambda : work(’delete’)).grid(row=0,column=1) numberzhengfu=tkinter.Button(number,text='+/-',width=10,command=lambda : work(’+/-’)).grid(row=0,column=2) numberchu=tkinter.Button(number,text='/',width=10,command=lambda : work(’/’)).grid(row=0,column=3) tkinter.Button(number,text='7',width=10,command=lambda : work(’7’)).grid(row=1,column=0) tkinter.Button(number,text='8',width=10,command=lambda : work(’8’)).grid(row=1,column=1) tkinter.Button(number,text='9',width=10,command=lambda : work(’9’)).grid(row=1,column=2) tkinter.Button(number,text='x',width=10,command=lambda : work(’x’)).grid(row=1,column=3) tkinter.Button(number,text='4',width=10,command=lambda : work(’4’)).grid(row=2,column=0) tkinter.Button(number,text='5',width=10,command=lambda : work(’5’)).grid(row=2,column=1) tkinter.Button(number,text='6',width=10,command=lambda : work(’6’)).grid(row=2,column=2) tkinter.Button(number,text='-',width=10,command=lambda : work(’-’)).grid(row=2,column=3) tkinter.Button(number,text='1',width=10,command=lambda : work(’1’)).grid(row=3,column=0) tkinter.Button(number,text='2',width=10,command=lambda : work(’2’)).grid(row=3,column=1) tkinter.Button(number,text='3',width=10,command=lambda : work(’3’)).grid(row=3,column=2) tkinter.Button(number,text='+',width=10,command=lambda : work(’+’)).grid(row=3,column=3) tkinter.Button(number,text='%',width=10,command=lambda : work(’%’)).grid(row=4,column=0) tkinter.Button(number,text='0',width=10,command=lambda : work(’0’)).grid(row=4,column=1) tkinter.Button(number,text='.',width=10,command=lambda : work(’.’)).grid(row=4,column=2) tkinter.Button(number,text='=',width=10,command=lambda : work(’=’)).grid(row=4,column=3) root.mainloop()if __name__==’__main__’: run()

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