核心語句:

eval語句,具有自動計算功能
借助tkinter完成圖形界面描述
流程如下:

創建界面:

from tkinter import * win=Tk() win.title('計算器') win.geometry('450x680')

結果如下:

2.放置按鈕:

but7=Button(win,text=7,width=3,font=('Arial',31),command=lambda :numinput(7))#如果只是先添加命令可以先不添加command關鍵字 but8=Button(win,text=8,width=3,font=('Arial',31),command=lambda :numinput(8)) but9=Button(win,text=9,width=3,font=('Arial',31),command=lambda :numinput(9)) but4=Button(win,text=4,width=3,font=('Arial',31),command=lambda :numinput(4)) but5=Button(win,text=5,width=3,font=('Arial',31),command=lambda :numinput(5)) but6=Button(win,text=6,width=3,font=('Arial',31),command=lambda :numinput(6)) but1=Button(win,text=1,width=3,font=('Arial',31),command=lambda :numinput(1)) but2=Button(win,text=2,width=3,font=('Arial',31),command=lambda :numinput(2)) but3=Button(win,text=3,width=3,font=('Arial',31),command=lambda :numinput(3)) but0=Button(win,text=0,width=3,font=('Arial',31),command=lambda :numinput(0)) bu1=Button(win,text='ans',width=3,font=('Arial',31),command=ans_) bu2=Button(win,text='π',width=3,font=('Arial',31),command=lambda :numinput(pi)) bu3=Button(win,text='e',width=3,font=('Arial',31),command=lambda :numinput(e)) bu4=Button(win,text='CE',width=3,font=('Arial',31),command=clear) bu5=Button(win,text='del',width=3,font=('Arial',31),command=delete_n) bu6=Button(win,text='x^2',width=3,font=('Arial',31),command=mi_2) bu7=Button(win,text='1/x',width=3,font=('Arial',31),command=x_1) bu8=Button(win,text='|x|',width=3,font=('Arial',31),command=juedui) bu9=Button(win,text='exp',width=3,font=('Arial',31),command=lambda :add_char('exp')) bu0=Button(win,text='mod',width=3,font=('Arial',31),command=lambda:add_char('%')) b1=Button(win,text='sqrt()',width=3,font=('Arial',31),command=sqrt_) b2=Button(win,text='(',width=3,font=('Arial',31),command=lambda :add_char('(')) b3=Button(win,text=')',width=3,font=('Arial',31),command=lambda :add_char(')')) b4=Button(win,text='n!',width=3,font=('Arial',31),command=jiechen) b5=Button(win,text='/',width=3,font=('Arial',31),command=lambda :add_char('/')) b6=Button(win,text='x^y',width=3,font=('Arial',31),command=lambda :add_char('^')) b7=Button(win,text='*',width=3,font=('Arial',31),command=lambda :add_char('*')) b8=Button(win,text='10^x',width=3,font=('Arial',31),command=zhi_10) b9=Button(win,text='-',width=3,font=('Arial',31),command=lambda :add_char('-')) b0=Button(win,text='log',width=3,font=('Arial',31),command=log_) b11=Button(win,text='+',width=3,font=('Arial',31),command=lambda :add_char('+')) b12=Button(win,text='ln',width=3,font=('Arial',31),command=IN_) b13=Button(win,text='+/-',width=3,font=('Arial',31),command=fu) b14=Button(win,text='.',width=3,font=('Arial',31),command=lambda :add_char('.')) b15=Button(win,text='=',width=3,font=('Arial',31),command=end1) b6.place(x=0,y=320) but7.place(x=90,y=320) but8.place(x=180,y=320) but9.place(x=270,y=320) b7.place(x=360,y=320)but4.place(x=90,y=410) but5.place(x=180,y=410) but6.place(x=270,y=410) b8.place(x=0,y=410) b9.place(x=360,y=410)but1.place(x=90,y=500) but2.place(x=180,y=500) but3.place(x=270,y=500) b0.place(x=0,y=500) b11.place(x=360,y=500)b13.place(x=90,y=590) but0.place(x=180,y=590) b14.place(x=270,y=590) b12.place(x=0,y=590) b15.place(x=360,y=590)bu2.place(x=90,y=50) bu3.place(x=180,y=50) bu4.place(x=270,y=50) bu1.place(x=0,y=50) bu5.place(x=360,y=50)bu7.place(x=90,y=140) bu8.place(x=180,y=140) bu9.place(x=270,y=140) bu6.place(x=0,y=140) bu0.place(x=360,y=140)b2.place(x=90,y=230) b3.place(x=180,y=230) b4.place(x=270,y=230) b1.place(x=0,y=230) b5.place(x=360,y=230) en=Entry(win,width=30,font=('Arial',20)) en.place(x=0,y=0)

結果如下:

為按鈕添加執行命令(前面button創建時已經添加了,如果不添加可以先不加上command=關鍵字段):

ans=0.0 flag=0 falg=0 def er_yuan():num=str(en.get())for i in range(0,len(num)):if (str.isdigit(num[i]) or num[i] == '.') == 0:number=eval(num[0:i])print(number)en.delete(0,END)if num[i]=='^':en.insert(0,str(number**(eval(num[i+1:]))))else:en.insert(0,str(number*(10**eval(num[i+3:]))))return def numinput(number):global flagif (flag):en.delete(0,END)flag=0first_num=en.get()en.delete(0,END)en.insert(0,str(first_num)+str(number)) def clear():en.delete(0,END) def delete_n():en.delete(len(str(en.get()))-1,END) def x_1():num=str(en.get())n=1# if(num[-1]==')'):#如果想要整體做1/x可以使用加括號的方法# en.delete(0,END)# en.insert(0,str(1/eval(num[1:-2])))# returnif(num[-1]==')'):for i in range(len(num)-2,0,-1):if(num[i]==')'):n+=1elif num[i]=='(':n-=1if(n==0):en.delete(0,END)# print(num[i+1:-2])en.insert(0,num[0:i]+str(1/eval(num[i+1:-1])))#注意切片也是滿足左開右閉的情況，只有右側不取數字時才有# 可以得到從對應位置到最后的結果returnfor i in range(len(num)-1,0,-1):if (str.isdigit(num[i]) or num[i]=='.')==0:pp=float(num[i+1:])if pp==0:en.delete(0,END)en.insert('error')print('ok')en.delete(0,END)en.insert(0,num[0:i+1]+str(1/pp))returnen.delete(0,END)en.insert(0,str(1/float(num[0:]))) def mi_2():num=str(en.get())for i in range(len(num)-1,0,-1):#只需要讀到第二個字符即可，因為如果第二個字符都不是字符#則即使前面是字符也是屬于單目符號(這里只有 自取負符號-）對結果無關緊要if (str.isdigit(num[i]) or num[i]=='.')==0:en.delete(0,END)en.insert(0,num[0:i+1]+str(eval(num[i:])*eval(num[i:])))returnen.delete(0,END)en.insert(0,str(eval(num)*eval(num))) #當點了=之后如果第一個為數字則就可以重新開始若要使用之前的數據可以使用ans # 但是如果是使用的符號則需要使用之前的數字不做修改 def add_char(x):global falgif (x=='exp' or x=='^'):falg=1num = en.get()en.delete(0,END)global flagif(flag):en.insert(0,str(ans)+x)flag=0else:en.insert(0, str(num) +x) def end1():global ansglobal flagglobal falg# for i in str(en.get()):if falg:er_yuan()falg=0returnnum=eval(str(en.get()))en.delete(0,END)en.insert(0,str(num))ans=numflag=1 def ans_():global ansnum=en.get()en.delete(0, END)en.insert(0, str(num)+str(ans)) def juedui():num = str(en.get())en.delete(0, END)en.insert(0, str(abs(eval(num)))) def jiechen():num = str(en.get())en.delete(0, END)sum=1k=abs(eval(num))for i in range(2,k+1,1):sum*=ien.insert(0, str(sum)) def sqrt_():num = str(en.get())for i in range(len(num) - 1, 0, -1):if (str.isdigit(num[i]) or num[i]=='.')==0:en.delete(0, END)en.insert(0, num[0:i+1] + str(math.sqrt(eval(num[i+1:]))))returnen.delete(0, END)en.insert(0, str(math.sqrt(eval(num)))) def zhi_10():num = str(en.get())for i in range(len(num) - 1, 0, -1):if (str.isdigit(num[i]) or num[i]=='.')==0:en.delete(0, END)en.insert(0, num[0:i+1] + str(10**(eval(num[i+1:]))))returnen.delete(0, END)en.insert(0, str(10**(eval(num)))) def fu():num=en.get()en.delete(0,END)en.insert(0,'-'+str(num)) def log_():num = str(en.get())for i in range(len(num) - 1, 0, -1):if (str.isdigit(num[i]) or num[i] == '.') == 0:en.delete(0, END)en.insert(0, num[0:i + 1] + str(math.log10(eval(num[i + 1:]))))returnen.delete(0, END)if eval(num[0:])<=0:en.insert(0,'error')returnen.insert(0, str(math.log10(eval(num[0:]))))def IN_():num = str(en.get())for i in range(len(num) - 1, 0, -1):if (str.isdigit(num[i]) or num[i] == '.') == 0:en.delete(0, END)en.insert(0, num[0:i + 1] + str(math.log(eval(num[i + 1:]))))returnen.delete(0, END)if eval(num[0:]) <= 0:en.insert(0, 'error')returnen.insert(0, str(math.log(eval(num[0:]))))

結果如下:

完整代碼:

from tkinter import * from math import pi from math import e import math win=Tk() win.title('計算器') win.geometry('450x680') ans=0.0 flag=0 falg=0 def er_yuan():num=str(en.get())for i in range(0,len(num)):if (str.isdigit(num[i]) or num[i] == '.') == 0:number=eval(num[0:i])print(number)en.delete(0,END)if num[i]=='^':en.insert(0,str(number**(eval(num[i+1:]))))else:en.insert(0,str(number*(10**eval(num[i+3:]))))return def numinput(number):global flagif (flag):en.delete(0,END)flag=0first_num=en.get()en.delete(0,END)en.insert(0,str(first_num)+str(number)) def clear():en.delete(0,END) def delete_n():en.delete(len(str(en.get()))-1,END) def x_1():num=str(en.get())n=1# if(num[-1]==')'):#如果想要整體做1/x可以使用加括號的方法# en.delete(0,END)# en.insert(0,str(1/eval(num[1:-2])))# returnif(num[-1]==')'):for i in range(len(num)-2,0,-1):if(num[i]==')'):n+=1elif num[i]=='(':n-=1if(n==0):en.delete(0,END)# print(num[i+1:-2])en.insert(0,num[0:i]+str(1/eval(num[i+1:-1])))#注意切片也是滿足左開右閉的情況，只有右側不取數字時才有# 可以得到從對應位置到最后的結果returnfor i in range(len(num)-1,0,-1):if (str.isdigit(num[i]) or num[i]=='.')==0:pp=float(num[i+1:])if pp==0:en.delete(0,END)en.insert('error')print('ok')en.delete(0,END)en.insert(0,num[0:i+1]+str(1/pp))returnen.delete(0,END)en.insert(0,str(1/float(num[0:]))) def mi_2():num=str(en.get())for i in range(len(num)-1,0,-1):#只需要讀到第二個字符即可，因為如果第二個字符都不是字符#則即使前面是字符也是屬于單目符號(這里只有 自取負符號-）對結果無關緊要if (str.isdigit(num[i]) or num[i]=='.')==0:en.delete(0,END)en.insert(0,num[0:i+1]+str(eval(num[i:])*eval(num[i:])))returnen.delete(0,END)en.insert(0,str(eval(num)*eval(num))) #當點了=之后如果第一個為數字則就可以重新開始若要使用之前的數據可以使用ans # 但是如果是使用的符號則需要使用之前的數字不做修改 def add_char(x):global falgif (x=='exp' or x=='^'):falg=1num = en.get()en.delete(0,END)global flagif(flag):en.insert(0,str(ans)+x)flag=0else:en.insert(0, str(num) +x) def end1():global ansglobal flagglobal falg# for i in str(en.get()):if falg:er_yuan()falg=0returnnum=eval(str(en.get()))en.delete(0,END)en.insert(0,str(num))ans=numflag=1 def ans_():global ansnum=en.get()en.delete(0, END)en.insert(0, str(num)+str(ans)) def juedui():num = str(en.get())en.delete(0, END)en.insert(0, str(abs(eval(num)))) def jiechen():num = str(en.get())en.delete(0, END)sum=1k=abs(eval(num))for i in range(2,k+1,1):sum*=ien.insert(0, str(sum)) def sqrt_():num = str(en.get())for i in range(len(num) - 1, 0, -1):if (str.isdigit(num[i]) or num[i]=='.')==0:en.delete(0, END)en.insert(0, num[0:i+1] + str(math.sqrt(eval(num[i+1:]))))returnen.delete(0, END)en.insert(0, str(math.sqrt(eval(num)))) def zhi_10():num = str(en.get())for i in range(len(num) - 1, 0, -1):if (str.isdigit(num[i]) or num[i]=='.')==0:en.delete(0, END)en.insert(0, num[0:i+1] + str(10**(eval(num[i+1:]))))returnen.delete(0, END)en.insert(0, str(10**(eval(num)))) def fu():num=en.get()en.delete(0,END)en.insert(0,'-'+str(num)) def log_():num = str(en.get())for i in range(len(num) - 1, 0, -1):if (str.isdigit(num[i]) or num[i] == '.') == 0:en.delete(0, END)en.insert(0, num[0:i + 1] + str(math.log10(eval(num[i + 1:]))))returnen.delete(0, END)if eval(num[0:])<=0:en.insert(0,'error')returnen.insert(0, str(math.log10(eval(num[0:]))))def IN_():num = str(en.get())for i in range(len(num) - 1, 0, -1):if (str.isdigit(num[i]) or num[i] == '.') == 0:en.delete(0, END)en.insert(0, num[0:i + 1] + str(math.log(eval(num[i + 1:]))))returnen.delete(0, END)if eval(num[0:]) <= 0:en.insert(0, 'error')returnen.insert(0, str(math.log(eval(num[0:])))) but7=Button(win,text=7,width=3,font=('Arial',31),command=lambda :numinput(7)) but8=Button(win,text=8,width=3,font=('Arial',31),command=lambda :numinput(8)) but9=Button(win,text=9,width=3,font=('Arial',31),command=lambda :numinput(9)) but4=Button(win,text=4,width=3,font=('Arial',31),command=lambda :numinput(4)) but5=Button(win,text=5,width=3,font=('Arial',31),command=lambda :numinput(5)) but6=Button(win,text=6,width=3,font=('Arial',31),command=lambda :numinput(6)) but1=Button(win,text=1,width=3,font=('Arial',31),command=lambda :numinput(1)) but2=Button(win,text=2,width=3,font=('Arial',31),command=lambda :numinput(2)) but3=Button(win,text=3,width=3,font=('Arial',31),command=lambda :numinput(3)) but0=Button(win,text=0,width=3,font=('Arial',31),command=lambda :numinput(0)) bu1=Button(win,text='ans',width=3,font=('Arial',31),command=ans_) bu2=Button(win,text='π',width=3,font=('Arial',31),command=lambda :numinput(pi)) bu3=Button(win,text='e',width=3,font=('Arial',31),command=lambda :numinput(e)) bu4=Button(win,text='CE',width=3,font=('Arial',31),command=clear) bu5=Button(win,text='del',width=3,font=('Arial',31),command=delete_n) bu6=Button(win,text='x^2',width=3,font=('Arial',31),command=mi_2) bu7=Button(win,text='1/x',width=3,font=('Arial',31),command=x_1) bu8=Button(win,text='|x|',width=3,font=('Arial',31),command=juedui) bu9=Button(win,text='exp',width=3,font=('Arial',31),command=lambda :add_char('exp')) bu0=Button(win,text='mod',width=3,font=('Arial',31),command=lambda:add_char('%')) b1=Button(win,text='sqrt()',width=3,font=('Arial',31),command=sqrt_) b2=Button(win,text='(',width=3,font=('Arial',31),command=lambda :add_char('(')) b3=Button(win,text=')',width=3,font=('Arial',31),command=lambda :add_char(')')) b4=Button(win,text='n!',width=3,font=('Arial',31),command=jiechen) b5=Button(win,text='/',width=3,font=('Arial',31),command=lambda :add_char('/')) b6=Button(win,text='x^y',width=3,font=('Arial',31),command=lambda :add_char('^')) b7=Button(win,text='*',width=3,font=('Arial',31),command=lambda :add_char('*')) b8=Button(win,text='10^x',width=3,font=('Arial',31),command=zhi_10) b9=Button(win,text='-',width=3,font=('Arial',31),command=lambda :add_char('-')) b0=Button(win,text='log',width=3,font=('Arial',31),command=log_) b11=Button(win,text='+',width=3,font=('Arial',31),command=lambda :add_char('+')) b12=Button(win,text='ln',width=3,font=('Arial',31),command=IN_) b13=Button(win,text='+/-',width=3,font=('Arial',31),command=fu) b14=Button(win,text='.',width=3,font=('Arial',31),command=lambda :add_char('.')) b15=Button(win,text='=',width=3,font=('Arial',31),command=end1) b6.place(x=0,y=320) but7.place(x=90,y=320) but8.place(x=180,y=320) but9.place(x=270,y=320) b7.place(x=360,y=320)but4.place(x=90,y=410) but5.place(x=180,y=410) but6.place(x=270,y=410) b8.place(x=0,y=410) b9.place(x=360,y=410)but1.place(x=90,y=500) but2.place(x=180,y=500) but3.place(x=270,y=500) b0.place(x=0,y=500) b11.place(x=360,y=500)b13.place(x=90,y=590) but0.place(x=180,y=590) b14.place(x=270,y=590) b12.place(x=0,y=590) b15.place(x=360,y=590)bu2.place(x=90,y=50) bu3.place(x=180,y=50) bu4.place(x=270,y=50) bu1.place(x=0,y=50) bu5.place(x=360,y=50)bu7.place(x=90,y=140) bu8.place(x=180,y=140) bu9.place(x=270,y=140) bu6.place(x=0,y=140) bu0.place(x=360,y=140)b2.place(x=90,y=230) b3.place(x=180,y=230) b4.place(x=270,y=230) b1.place(x=0,y=230) b5.place(x=360,y=230) en=Entry(win,width=30,font=('Arial',20)) en.place(x=0,y=0)mainloop()

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