本文实例介绍了基于python的Tkinter实现简易计算器的详细代码,分享给大家供大家参考,具体内容如下
第一种:使用python 的 Tkinter实现一个简易计算器
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#coding:utf-8 from Tkinter import * import time root = Tk() def cacl(input_str): if "x" in input_str: ret = input_str.split( "x" ) return int (ret[ 0 ]) * int (ret[ 1 ]) def callback(n): print n def callback1(n): print n class App: def __init__( self , master): frame1 = Frame(master) frame1.pack() frame = Frame(master) frame.pack() Button(frame, text = "1" ,command = lambda : callback( 1 ) ).grid(row = 0 ,column = 0 ) Button(frame, text = "2" ,command = lambda : callback( 2 ) ).grid(row = 0 ,column = 1 ) Button(frame, text = "3" ,command = lambda : callback( 3 ) ).grid(row = 0 ,column = 2 ) Button(frame, text = "4" ,command = lambda : callback( 4 ) ).grid(row = 1 ,column = 0 ) Button(frame, text = "5" ,command = lambda : callback( 5 ) ).grid(row = 1 ,column = 1 ) Button(frame, text = "6" ,command = lambda : callback( 6 ) ).grid(row = 1 ,column = 2 ) Button(frame, text = "7" ,command = lambda : callback( 7 ) ).grid(row = 2 ,column = 0 ) Button(frame, text = "8" ,command = lambda : callback( 8 ) ).grid(row = 2 ,column = 1 ) Button(frame, text = "9" ,command = lambda : callback( 9 ) ).grid(row = 2 ,column = 2 ) Button(frame, text = "0" ,command = lambda : callback( 0 ) ).grid(row = 3 ,column = 0 ) Button(frame, text = "+" ,command = lambda : callback1( "+" ) ).grid(row = 3 ,column = 1 ) Button(frame, text = "-" ,command = lambda : callback1( "-" ) ).grid(row = 3 ,column = 2 ) Button(frame, text = "*" ,command = lambda : callback1( "*" ) ).grid(row = 4 ,column = 1 ) Button(frame, text = "/" ,command = lambda : callback1( "/" ) ).grid(row = 4 ,column = 2 ) Button(frame, text = "=" , command = self .say_hi).grid(row = 4 ,column = 0 ) w = Label(frame1,text = "输入结果" ) w.pack() self .e = Entry(frame1) self .e.pack(padx = 5 ) w1 = Label(frame1,text = "计算结果" ) w1.pack() v = StringVar() e1 = Entry(frame1, textvariable = v) v. set ("") self .v = v e1.pack() def say_hi( self ): print "hi there, everyone!" , self .e.get() input_str = self .e.get() self .v. set (cacl(input_str)) app = App(root) root.mainloop() |
第二种:基于Tkinter用50行Python代码实现简易计算器
Tkinter一般是python自带的,所以代码不需要其他组件,本程序是在python2.7版本实现的。
主要涉及了tkinter的使用,函数定义和调用,匿名函数的使用,类成员函数定义等python基础知识,适合新手学习。
代码如下:
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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 #继承了Frame类,初始化程序界面的布局 class Calculator(Frame): def __init__( self ): Frame.__init__( self ) self .pack(expand = YES, fill = BOTH) self .master.title( 'Simple Calculater' ) display = StringVar() #添加输入框 Entry( self , relief = SUNKEN, textvariable = display).pack(side = TOP, expand = YES, fill = BOTH) #添加横条型框架以及里面的按钮 for key in ( '123' , '456' , '789' , '-0.' ): keyF = frame( self , TOP) for char in key: button(keyF, LEFT, char, lambda w = display, c = char:w. set (w.get() + c)) #添加操作符按钮 opsF = frame( self , TOP) for char in '+-*/=' : if char = = '=' : btn = button(opsF, LEFT, char) btn.bind( '<ButtonRelease - 1>' , lambda e, s = self , w = display:s.calc(w), '+' ) else : btn = button(opsF, LEFT, char, lambda w = display, s = '%s' % char:w. set (w.get() + s)) #添加清除按钮 clearF = frame( self , BOTTOM) button(clearF, LEFT, 'clear' , lambda w = display:w. set ('')) #调用eval函数计算表达式的值 def calc( self , display): try : display. set ( eval (display.get())) except : display. set ( "ERROR" ) #程序的入口 if __name__ = = '__main__' : print ( 'ok' ) Calculator().mainloop() |
实现效果如下图:
以上就是本文的全部内容,希望对大家的学习Python程序设计有所帮助。