''' Function: tkinter 计算器 ''' import math import tkinter root = tkinter.Tk() root.resizable(width=False, height=False) '''hypeparameter''' # 是否按下了运算符 IS_CALC = False # 存储数字 STORAGE = [] # 显示框最多显示多少个字符 MAXSHOWLEN = 18 # 当前显示的数字 CurrentShow = tkinter.StringVar() CurrentShow.set('0') '''按下数字键(0-9)''' def pressNumber(number): global IS_CALC if IS_CALC: CurrentShow.set('0') IS_CALC = False if CurrentShow.get() == '0': CurrentShow.set(number) else: if len(CurrentShow.get()) < MAXSHOWLEN: CurrentShow.set(CurrentShow.get() + number) '''按下小数点''' def pressDP(): global IS_CALC if IS_CALC: CurrentShow.set('0') IS_CALC = False if len(CurrentShow.get().split('.')) == 1: if len(CurrentShow.get()) < MAXSHOWLEN: CurrentShow.set(CurrentShow.get() + '.') '''清零''' def clearAll(): global STORAGE global IS_CALC STORAGE.clear() IS_CALC = False CurrentShow.set('0') '''清除当前显示框内所有数字''' def clearCurrent(): CurrentShow.set('0') '''删除显示框内最后一个数字''' def delOne(): global IS_CALC if IS_CALC: CurrentShow.set('0') IS_CALC = False if CurrentShow.get() != '0': if len(CurrentShow.get()) > 1: CurrentShow.set(CurrentShow.get()[:-1]) else: CurrentShow.set('0') '''计算答案修正''' def modifyResult(result): result = str(result) if len(result) > MAXSHOWLEN: if len(result.split('.')[0]) > MAXSHOWLEN: result = 'Overflow' else: # 直接舍去不考虑四舍五入问题 result = result[:MAXSHOWLEN] return result '''按下运算符''' def pressOperator(operator): global STORAGE global IS_CALC if operator == '+/-': if CurrentShow.get().startswith('-'): CurrentShow.set(CurrentShow.get()[1:]) else: CurrentShow.set('-' + CurrentShow.get()) elif operator == '1/x': try: result = 1 / float(CurrentShow.get()) except: result = 'illegal operation' result = modifyResult(result) CurrentShow.set(result) IS_CALC = True elif operator == 'sqrt': try: result = math.sqrt(float(CurrentShow.get())) except: result = 'illegal operation' result = modifyResult(result) CurrentShow.set(result) IS_CALC = True elif operator == 'MC': STORAGE.clear() elif operator == 'MR': if IS_CALC: CurrentShow.set('0') STORAGE.append(CurrentShow.get()) expression = ''.join(STORAGE) try: result = eval(expression) except: result = 'illegal operation' result = modifyResult(result) CurrentShow.set(result) IS_CALC = True elif operator == 'MS': STORAGE.clear() STORAGE.append(CurrentShow.get()) elif operator == 'M+': STORAGE.append(CurrentShow.get()) elif operator == 'M-': if CurrentShow.get().startswith('-'): STORAGE.append(CurrentShow.get()) else: STORAGE.append('-' + CurrentShow.get()) elif operator in ['+', '-', '*', '/', '%']: STORAGE.append(CurrentShow.get()) STORAGE.append(operator) IS_CALC = True elif operator == '=': if IS_CALC: CurrentShow.set('0') STORAGE.append(CurrentShow.get()) expression = ''.join(STORAGE) try: result = eval(expression) # 除以0的情况 except: result = 'illegal operation' result = modifyResult(result) CurrentShow.set(result) STORAGE.clear() IS_CALC = True '''Demo''' def Demo(): root.minsize(320, 420) root.title('Calculator') # 布局 # --文本框 label = tkinter.Label(root, textvariable=CurrentShow, bg='black', anchor='e', bd=5, fg='white', font=('楷体', 20)) label.place(x=20, y=50, width=280, height=50) # --第一行 # ----Memory clear button1_1 = tkinter.Button(text='MC', bg='#666', bd=2, command=lambda: pressOperator('MC')) button1_1.place(x=20, y=110, width=50, height=35) # ----Memory read button1_2 = tkinter.Button(text='MR', bg='#666', bd=2, command=lambda: pressOperator('MR')) button1_2.place(x=77.5, y=110, width=50, height=35) # ----Memory save button1_3 = tkinter.Button(text='MS', bg='#666', bd=2, command=lambda: pressOperator('MS')) button1_3.place(x=135, y=110, width=50, height=35) # ----Memory + button1_4 = tkinter.Button(text='M+', bg='#666', bd=2, command=lambda: pressOperator('M+')) button1_4.place(x=192.5, y=110, width=50, height=35) # ----Memory - button1_5 = tkinter.Button(text='M-', bg='#666', bd=2, command=lambda: pressOperator('M-')) button1_5.place(x=250, y=110, width=50, height=35) # --第二行 # ----删除单个数字 button2_1 = tkinter.Button(text='del', bg='#666', bd=2, command=lambda: delOne()) button2_1.place(x=20, y=155, width=50, height=35) # ----清除当前显示框内所有数字 button2_2 = tkinter.Button(text='CE', bg='#666', bd=2, command=lambda: clearCurrent()) button2_2.place(x=77.5, y=155, width=50, height=35) # ----清零(相当于重启) button2_3 = tkinter.Button(text='C', bg='#666', bd=2, command=lambda: clearAll()) button2_3.place(x=135, y=155, width=50, height=35) # ----取反 button2_4 = tkinter.Button(text='+/-', bg='#666', bd=2, command=lambda: pressOperator('+/-')) button2_4.place(x=192.5, y=155, width=50, height=35) # ----开根号 button2_5 = tkinter.Button(text='sqrt', bg='#666', bd=2, command=lambda: pressOperator('sqrt')) button2_5.place(x=250, y=155, width=50, height=35) # --第三行 # ----7 button3_1 = tkinter.Button(text='7', bg='#bbbbbb', bd=2, command=lambda: pressNumber('7')) button3_1.place(x=20, y=200, width=50, height=35) # ----8 button3_2 = tkinter.Button(text='8', bg='#bbbbbb', bd=2, command=lambda: pressNumber('8')) button3_2.place(x=77.5, y=200, width=50, height=35) # ----9 button3_3 = tkinter.Button(text='9', bg='#bbbbbb', bd=2, command=lambda: pressNumber('9')) button3_3.place(x=135, y=200, width=50, height=35) # ----除 button3_4 = tkinter.Button(text='/', bg='#708069', bd=2, command=lambda: pressOperator('/')) button3_4.place(x=192.5, y=200, width=50, height=35) # ----取余 button3_5 = tkinter.Button(text='%', bg='#708069', bd=2, command=lambda: pressOperator('%')) button3_5.place(x=250, y=200, width=50, height=35) # --第四行 # ----4 button4_1 = tkinter.Button(text='4', bg='#bbbbbb', bd=2, command=lambda: pressNumber('4')) button4_1.place(x=20, y=245, width=50, height=35) # ----5 button4_2 = tkinter.Button(text='5', bg='#bbbbbb', bd=2, command=lambda: pressNumber('5')) button4_2.place(x=77.5, y=245, width=50, height=35) # ----6 button4_3 = tkinter.Button(text='6', bg='#bbbbbb', bd=2, command=lambda: pressNumber('6')) button4_3.place(x=135, y=245, width=50, height=35) # ----乘 button4_4 = tkinter.Button(text='*', bg='#708069', bd=2, command=lambda: pressOperator('*')) button4_4.place(x=192.5, y=245, width=50, height=35) # ----取导数 button4_5 = tkinter.Button(text='1/x', bg='#708069', bd=2, command=lambda: pressOperator('1/x')) button4_5.place(x=250, y=245, width=50, height=35) # --第五行 # ----3 button5_1 = tkinter.Button(text='3', bg='#bbbbbb', bd=2, command=lambda: pressNumber('3')) button5_1.place(x=20, y=290, width=50, height=35) # ----2 button5_2 = tkinter.Button(text='2', bg='#bbbbbb', bd=2, command=lambda: pressNumber('2')) button5_2.place(x=77.5, y=290, width=50, height=35) # ----1 button5_3 = tkinter.Button(text='1', bg='#bbbbbb', bd=2, command=lambda: pressNumber('1')) button5_3.place(x=135, y=290, width=50, height=35) # ----减 button5_4 = tkinter.Button(text='-', bg='#708069', bd=2, command=lambda: pressOperator('-')) button5_4.place(x=192.5, y=290, width=50, height=35) # ----等于 button5_5 = tkinter.Button(text='=', bg='#708069', bd=2, command=lambda: pressOperator('=')) button5_5.place(x=250, y=290, width=50, height=80) # --第六行 # ----0 button6_1 = tkinter.Button(text='0', bg='#bbbbbb', bd=2, command=lambda: pressNumber('0')) button6_1.place(x=20, y=335, width=107.5, height=35) # ----小数点 button6_2 = tkinter.Button(text='.', bg='#bbbbbb', bd=2, command=lambda: pressDP()) button6_2.place(x=135, y=335, width=50, height=35) # ----加 button6_3 = tkinter.Button(text='+', bg='#708069', bd=2, command=lambda: pressOperator('+')) button6_3.place(x=192.5, y=335, width=50, height=35) root.mainloop() if __name__ == '__main__': Demo()