还是我~~~
"""计算器""":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('来啦！！！')
Calculator().mainloop()
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