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| #!/usr/bin/python
#coding: utf-8
#Filename: calculator_GUI.py
#author：邢帅坤
import tkinter as TK
import re
def change(eq,count):
'''
:param eq: 刚去完括号或者乘除后的格式化列表
:param count: 发生变化的元素的索引
:return: 返回一个不存在 '+-' ,'--'类的格式化列表
'''
if eq[count] == '-':
if eq[count-1] == '-':
eq[count-1] = '+'
del eq[count]
elif eq[count-1] == '+':
eq[count-1] = '-'
del eq[count]
return eq
def remove_multiplication_division(eq):
'''
:param eq: 带有乘除号的格式化列表
:return: 去除了乘除号的格式化列表
'''
count = 0
for i in eq:
if i == '*':
if eq[count+1] != '-':
eq[count-1] = float(eq[count-1]) * float(eq[count+1])
del(eq[count])
del(eq[count])
elif eq[count+1] == '-':
eq[count] = float(eq[count-1]) * float(eq[count+2])
eq[count-1] = '-'
del(eq[count+1])
del(eq[count+1])
eq = change(eq,count-1)
return remove_multiplication_division(eq)
elif i == '/':
if eq[count+1] != '-':
eq[count-1] = float(eq[count-1]) / float(eq[count+1])
del(eq[count])
del(eq[count])
elif eq[count+1] == '-':
eq[count] = float(eq[count-1]) / float(eq[count+2])
eq[count-1] = '-'
del(eq[count+1])
del(eq[count+1])
eq = change(eq,count-1)
return remove_multiplication_division(eq)
count = count + 1
return eq
def remove_plus_minus(eq):
'''
:param eq: 只带有加减号的格式化列表
:return: 计算出整个列表的结果
'''
count = 0
if eq[0] != '-' and eq[0] != '+':
sum = float(eq[0])
else:
sum = 0.0
for i in eq:
if i == '-':
sum = sum - float(eq[count+1])
elif i == '+':
sum = sum + float(eq[count+1])
count = count + 1
if sum >= 0:
eq = [str(sum)]
else:
eq = ['-',str(-sum)]
return eq
def calculate(s_eq):
'''
:param s_eq: 不带括号的格式化列表
:return: 计算结果
'''
if '*' or '/' in s_eq:
s_eq = remove_multiplication_division(s_eq)
if '+' or '-' in s_eq:
s_eq = remove_plus_minus(s_eq)
return s_eq
def simplify(format_list):
'''
:param format_list: 输入的算式格式化列表如['60','+','7','*','8']
:return: 通过递归去括号，返回简化后的列表
'''
bracket = 0 # 用于存放左括号在格式化列表中的索引
count = 0
for i in format_list:
if i == '(':
bracket = count
elif i == ')':
temp = format_list[bracket + 1 : count]
new_temp = calculate(temp)
format_list = format_list[:bracket] + new_temp + format_list[count+1:]
format_list = change(format_list,bracket) # 解决去括号后会出现的-- +- 问题
return simplify(format_list) # 递归去括号
count = count + 1
return format_list # 当递归到最后一层的时候，不再有括号，因此返回列表
def caculator(eq):
format_list = eq_format(eq)
s_eq = simplify(format_list)
ans = calculate(s_eq)
if len(ans) == 2:
ans = -float(ans[1])
else:
ans = float(ans[0])
return ans
# 获得按下的数字或者符号
def getnum(num):
temp = equation.get()
temp2 = result.get()
print(temp)
print(temp2)
if temp2 != ' ':
temp = '0'
temp2 = ' '
result.set(temp2)
if (temp=='0'):
temp = ''
temp = temp + num
equation.set(temp)
print(equation)
# 按下Mc键时，去除最后一个字符
def clear():
equation.set('0')
result.set('0')
# 按下Mr时，调出上次运算的结果
def get_last_result():
equation.set(last_result)
result.set(0)
# 按下等于号时计算结果
def run():
global last_result
temp = equation.get()
temp = temp.replace('x','*')
temp = temp.replace('÷','/')
print(temp)
answer = caculator(temp)
answer = '%.2f'%answer
result.set(str(answer))
last_result = answer
def eq_format(eq):
'''
:param eq: 输入的算式字符串
:return: 格式化以后的列表，如['60','+','7','*','8']
'''
format_list = re.findall('[\d\.]+|\(|\+|\-|\*|\/|\)',eq)
return format_list
# 主窗口
root = TK.Tk() # 创建TK实例
root.title("邢帅坤的计算器") # 设置窗口的显示名字
root.resizable(0,0) # 设置主窗口的宽度和高度是否可以通过鼠标进行拉伸改变，此处设置为不能
root.geometry('320x420') # 这里设置主窗口的初始尺寸，因为我们在上面设定了主窗口大小 不可变，因此这个尺寸也就是主窗口一直不变的尺寸了
result = TK.StringVar() # 用来显示结果的可变文本
equation = TK.StringVar() # 用来显示算式的可变文本
result.set(' ') # 赋初始值
equation.set('0') # 赋初始值
# 结果显示框
show_uresult = TK.Label(root,bg='white',fg = 'black',font = ('Arail','15'),bd='0',textvariable =equation,anchor='se')
show_dresult = TK.Label(root,bg='white',fg = 'black',font = ('Arail','30'),bd='0',textvariable=result,anchor='se')
show_uresult.place(x='10',y='10',width='300',height='50')
show_dresult.place(x='10',y='60',width='300',height='50')
# 按钮
# 第一行按钮
button_Mc =TK.Button(root,text='Mc',bg='DarkGray',command=clear)
button_Mc.place(x = '10',y='150',width = '60',height='40')
button_Mr =TK.Button(root,text='Mr',bg='DarkGray',command = get_last_result)
button_Mr.place(x = '90',y='150',width = '60',height='40')
button_lbracket=TK.Button(root,text='(',bg='DarkGray',command= lambda : getnum('('))
button_lbracket.place(x = '170',y='150',width = '60',height='40')
button_rbracket=TK.Button(root,text=')',bg='DarkGray',command= lambda : getnum(')'))
button_rbracket.place(x = '250',y='150',width = '60',height='40')
# 第二行按钮
button_7 =TK.Button(root,text='7',bg='DarkGray',command= lambda : getnum('7'))
button_7.place(x = '10',y='205',width = '60',height='40')
button_8 =TK.Button(root,text='8',bg='DarkGray',command= lambda : getnum('8'))
button_8.place(x = '90',y='205',width = '60',height='40')
button_9 =TK.Button(root,text='9',bg='DarkGray',command= lambda : getnum('9'))
button_9.place(x = '170',y='205',width = '60',height='40')
button_division =TK.Button(root,text='÷',bg='DarkGray',command= lambda : getnum('÷'))
button_division.place(x = '250',y='205',width = '60',height='40')
# 第三行按钮
button_4 =TK.Button(root,text='4',bg='DarkGray',command= lambda : getnum('4'))
button_4.place(x = '10',y='260',width = '60',height='40')
button_5 =TK.Button(root,text='5',bg='DarkGray',command= lambda : getnum('5'))
button_5.place(x = '90',y='260',width = '60',height='40')
button_6 =TK.Button(root,text='6',bg='DarkGray',command= lambda : getnum('6'))
button_6.place(x = '170',y='260',width = '60',height='40')
button_multiplication =TK.Button(root,text='X',bg='DarkGray',command= lambda : getnum('x'))
button_multiplication.place(x = '250',y='260',width = '60',height='40')
# 第四行按钮
button_1 =TK.Button(root,text='1',bg='DarkGray',command= lambda :getnum('1'))
button_1.place(x = '10',y='315',width = '60',height='40')
button_2 =TK.Button(root,text='2',bg='DarkGray',command= lambda : getnum('2'))
button_2.place(x = '90',y='315',width = '60',height='40')
button_3 =TK.Button(root,text='3',bg='DarkGray',command= lambda : getnum('3'))
button_3.place(x = '170',y='315',width = '60',height='40')
button_minus =TK.Button(root,text='—',bg='DarkGray',command= lambda : getnum('-'))
button_minus.place(x = '250',y='315',width = '60',height='40')
# 第五行按钮
button_0 =TK.Button(root,text='0',bg='DarkGray',command= lambda : getnum('0'))
button_0.place(x = '10',y='370',width = '60',height='40')
button_point =TK.Button(root,text='.',bg='DarkGray',command= lambda : getnum('.'))
button_point.place(x = '90',y='370',width = '60',height='40')
button_equal=TK.Button(root,text='=',bg='DarkGray',command= run)
button_equal.place(x = '170',y='370',width = '60',height='40')
button_plus =TK.Button(root,text='+',bg='DarkGray',command= lambda : getnum('+'))
button_plus.place(x = '250',y='370',width = '60',height='40')
# 在编写完所有的GUI与相关函数后，我们要让这个窗口不断的循环，做成一直显示的效果，如果没有这一行，主窗口会出现一瞬间然后消失，像是程序没有运行一样
root.mainloop()
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