Python制作一个简易计算器
1 import tkinter
idc=tkinter.Tk() 2 idc.title("计算器") 3 #记录算式 4 expstr="" 5 #记录运算历史 6 history=[] 7 8 def onClick(key): 9 global expstr 10 11 if key=="=": 12 jieguo =round(eval(expstr),2) 13 result["text"]=jieguo 14 frame_right.pack() 15 16 t=tkinter.Label(frame_inner,text=expstr+"="+str(jieguo),bg="seashell") 17 t.pack() 18 history.append(t) 19 elif key=="AC": 20 result["text"]="" 21 expstr="" 22 else: 23 expstr=expstr+str(key) 24 result["text"]=expstr 25 26 27 frame_grap=tkinter.Frame(idc) 28 frame_grap.pack(fill="y",side="left") 29 frame_left=tkinter.Frame(idc) 30 31 result=tkinter.Label(frame_left,bg="seashell",text="0",height=2,font=("Arial",34,"bold")) 32 result.grid(row=0,column=0,columnspan=4,sticky=tkinter.E) 33 34 ac=tkinter.Button(frame_left,text="AC",width=6,height=2,command=lambda:onClick("AC")) 35 ac.grid(row=1,column=0) 36 37 negative=tkinter.Button(frame_left,text="+/-",width=6,height=2,command=lambda:onClick("-")) 38 negative.grid(row=1,column=1) 39 40 percent=tkinter.Button(frame_left,text="%",width=6,height=2,command=lambda:onClick("/100")) 41 percent.grid(row=1,column=2) 42 43 division=tkinter.Button(frame_left,text="/",width=6,height=2,command=lambda:onClick("/")) 44 division.grid(row=1,column=3) 45 46 num7=tkinter.Button(frame_left,text="7",width=6,height=2,command=lambda:onClick(7)) 47 num7.grid(row=2,column=0) 48 num8=tkinter.Button(frame_left,text="8",width=6,height=2,command=lambda:onClick(8)) 49 num8.grid(row=2,column=1) 50 num9=tkinter.Button(frame_left,text="9",width=6,height=2,command=lambda:onClick(9)) 51 num9.grid(row=2,column=2) 52 multi=tkinter.Button(frame_left,text="*",width=6,height=2,command=lambda:onClick("*")) 53 multi.grid(row=2,column=3) 54 55 num4=tkinter.Button(frame_left,text="4",width=6,height=2,command=lambda:onClick(4)) 56 num4.grid(row=3,column=0) 57 num5=tkinter.Button(frame_left,text="5",width=6,height=2,command=lambda:onClick(5)) 58 num5.grid(row=3,column=1) 59 num6=tkinter.Button(frame_left,text="6",width=6,height=2,command=lambda:onClick(6)) 60 num6.grid(row=3,column=2) 61 sub=tkinter.Button(frame_left,text="-",width=6,height=2,command=lambda:onClick("-")) 62 sub.grid(row=3,column=3) 63 64 num1=tkinter.Button(frame_left,text="1",width=6,height=2,command=lambda:onClick(1)) 65 num1.grid(row=4,column=0) 66 num2=tkinter.Button(frame_left,text="2",width=6,height=2,command=lambda:onClick(2)) 67 num2.grid(row=4,column=1) 68 num3=tkinter.Button(frame_left,text="3",width=6,height=2,command=lambda:onClick(3)) 69 num3.grid(row=4,column=2) 70 add=tkinter.Button(frame_left,text="+",width=6,height=2,command=lambda:onClick("+")) 71 add.grid(row=4,column=3) 72 73 num0=tkinter.Button(frame_left,text="0",width=6,height=2,command=lambda:onClick(0)) 74 num0.grid(row=5,column=0,columnspan=2) 75 point=tkinter.Button(frame_left,text=".",width=6,height=2,command=lambda:onClick(".")) 76 point.grid(row=5,column=2) 77 equals=tkinter.Button(frame_left,text="=",width=6,height=2,command=lambda:onClick("=")) 78 equals.grid(row=5,column=3) 79 80 frame_left.pack(fill="y",side="left") 81 frame_right=tkinter.Frame(idc,width=200) 82 tkinter.Label(frame_right,text="运算历史",font=("Arial",14,"underline bold")).pack() 83 frame_inner=tkinter.Frame(frame_right) 84 frame_inner.pack(fill="x",side="top") 85 86 def clean_history(): 87 for x in history: 88 print(x) 89 x.destroy() 90 91 cls_button=tkinter.Button(frame_right,text="清空",command=lambda:clean_history()) 92 cls_button.pack(fill="x",side="top") 93 94 idc.mainloop()