python編寫計算器，供大家參考，具體內容如下

（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，只能鼠標點擊左鍵才可執行。初始時顯示0.0，每次輸入的內容存于D:\num.txt(啟動程序時自動創建)

（3）" AC " 記錄清零返回初始 0.0；" delete " 刪除上一個輸入內容；" +/- " 將正數為負數，負數為正數

（4）對于不同的進制數值系統，小數的精準值不同。

因此計算機會出現 0.1+0.2=0.3000000000004 的現象

能對數據進行截斷處理，可以解決問題，但精度喪失。

（此計算機沒有進行截斷處理）

import tkinter,os

from tkinter import *

def temp(string):#空白間隔

temp=tkinter.Frame(string,width=20,height=50)

temp.pack()

flag=0

node=0

def 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')) # 重新設置標簽文本

root.after(500,num_work) # 每隔0.5s調用函數num_work自身獲取結果

def num_math_int(num1,num2):#整數運算

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('0.0\n')

elif string=='=':

num1=lists[-2]

num2=lists[-1]

if num1=='\n':#解決末尾為換行的情況

num1=lists[-3]

#將百分數小數化

#出現結果多0.0000000001

num1=decimal(num1)

num2=decimal(num2)

try: #判斷兩個數是整數還是小數

number=int(num1)

number=int(num2[1:])

num_math_int(num1,num2)#兩個數進行整數運算

except:

num_math_float(num1,num2)#兩個數進行小數運算

elif string=='.':

if lists[-1].count('.')==0:#判斷結尾是否有小數點，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('0.0\n')

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()

#獲取當前屏幕的寬

#y = root.winfo_screenheight()

#獲取當前屏幕的高

#print(((x-500)//2),((y-600)//2))#為居中提供的參數

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，執行函數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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