Python Tkinter实现的简单计算器

最近初次接触Python，就用计算器来练练手吧。

from tkinter import *
def GetInputValue(ShowNumEntry, Value):#用来显示值
ShowNumEntry.insert(END,Value)
def GetNumOne():#按钮1并显示
GetInputValue(ShowNumEntry,"1")
def GetNumTwo():#按钮2并显示
GetInputValue(ShowNumEntry,"2")
def GetNumThree():#按钮3并显示
GetInputValue(ShowNumEntry,"3")
def GetNumFour():#按钮4并显示
GetInputValue(ShowNumEntry,"4")
def GetNumFive():#按钮5并显示
GetInputValue(ShowNumEntry,"5")
def GetNumSix():#按钮6并显示
GetInputValue(ShowNumEntry,"6")
def GetNumSeven():#按钮7并显示
GetInputValue(ShowNumEntry,"7")
def GetNumEight():#按钮8并显示
GetInputValue(ShowNumEntry,"8")
def GetNumNine():#按钮9并显示
GetInputValue(ShowNumEntry,"9")
def GetNumZero():#按钮0并显示
GetInputValue(ShowNumEntry,"0")
def GetDot():#按钮.并显示
GetInputValue(ShowNumEntry,".")
def GetPlus():#按钮+并显示
GetInputValue(ShowNumEntry,"+")
def GetMinus():#按钮-并显示
GetInputValue(ShowNumEntry,"-")
def GetClean():#清除
ShowNumEntry.delete(0,END)
def GetMultiply():#按钮*并显示
GetInputValue(ShowNumEntry,"*")
def GetDivision():#按钮/并显示
GetInputValue(ShowNumEntry,"/")
def GetResult():#计算结果并显示
result = eval(ShowNumEntry.get())
GetClean()
ShowNumEntry.insert(0,str(result))
root = Tk()
root.wm_minsize(400,160)#设置窗口大小
ShowNumEntry = Entry(root, width=8, justify="right", font=12 )
ShowNumEntry.grid(row=0, column=5)
NumOneBtn = Button(root,text = "1", width = 8,height = 2,command = GetNumOne)
NumOneBtn.grid(row=1, column=0)
NumTwoBtn = Button(root,text = "2", width = 8,height = 2,command = GetNumTwo)
NumTwoBtn.grid(row=1, column=1)
NumThreeBtn = Button(root,text = "3", width = 8,height = 2,command = GetNumThree)
NumThreeBtn.grid(row=1, column=2)
PlusBtn = Button(root,text = "+", width = 8,height = 2,command = GetPlus)
PlusBtn.grid(row=1, column=3)
MinusBtn = Button(root,text = "-", width = 8,height = 2,command = GetMinus)
MinusBtn.grid(row=1, column=4)
CleanBtn = Button(root,text = "C", width = 8,height = 2,command = GetClean)
CleanBtn.grid(row=1, column=5)
NumFourBtn = Button(root,text = "4", width = 8,height = 2,command = GetNumFour)
NumFourBtn.grid(row=2, column=0)
NumFiveBtn = Button(root,text = "5", width = 8,height = 2,command = GetNumFive)
NumFiveBtn.grid(row=2, column=1)
NumSixBtn = Button(root,text = "6", width = 8,height = 2,command = GetNumSix)
NumSixBtn.grid(row=2, column=2)
DotBtn = Button(root,text = ".", width = 8,height = 2,command =GetDot)
DotBtn.grid(row=2, column=3)
MultiplyBtn = Button(root,text = "*", width = 8,height = 2,command = GetMultiply)
MultiplyBtn.grid(row=2, column=4)
ResultBtn = Button(root,text = "=", width = 8, height = 2,background = "green",command=GetResult)
ResultBtn.grid(row=2, column=5)
NumSevenBtn = Button(root,text = "7",width = 8, height = 2, command = GetNumSeven)
NumSevenBtn.grid(row=3, column=0)
NumEightBtn = Button(root,text = "8", width = 8, height = 2, command = GetNumEight)
NumEightBtn.grid(row=3, column=1)
NumNineBtn = Button(root,text = "9", width = 8, height = 2, command = GetNumNine)
NumNineBtn.grid(row=3, column=2)
NumZeroBtn = Button(root,text = "0", width = 8, height = 2, command = GetNumZero)
NumZeroBtn.grid(row=3, column=3)
DivisionBtn = Button(root,text = "/", width = 8, height = 2, command = GetDivision)
DivisionBtn.grid(row=3, column=4)
root.mainloop()

这个计算器的ui，我自己都不忍心看。



对于代码的一些优化：

①由于用到很多的按钮，我们可以用for循环来简化代码，参考代码如下：

from tkinter import *
#创建横条型框架
def frame(root, side):
w = Frame(root)
w.pack(side = side, expand = YES, fill = BOTH)
return w
#创建按钮
def button(root, side, text, command = None):
w = Button(root, text = text, command = command)
w.pack(side = side, expand = YES, fill = BOTH)
return w
root =Tk()
for key in ('123', '456', '789', '-0.'):
KeyF =frame(root,TOP)
for char in key:
button(KeyF, LEFT, char)
root.mainloop()

②可以用lambda表达式，来简化代码：这样可以少写一个污染函数，是代码更加简洁

NumNineBtn = Button(root,text = "9", width = 8, height = 2, command = lambda : GetInputValue(ShowNumEntry,"9"))

NumNineBtn .grid(row=3, column=2)

//对于上述代码的一些疑问：

//如果将grid直接写在后面，点击之后就会报错：

def GetInputValue(entry, argu):
entry.insert(END, argu)
def GetNumOne():
GetInputValue(ShowNumEntry,"1")
from tkinter import *
root = Tk()
ShowNumEntry = Entry(root, justify="right", font=12).grid(row=0, column=0)
button = Button(root,text="测试",command=GetNumOne).grid(row=1, column=0)
root.mainloop()