为什么我的按钮不适用于 Tkinter 计算器?
Why my buttons don't work for Tkinter Calculator?
#Calculator codes
from Tkinter import*
class Calculator():
def __init__ (self):
self.total = 0
self.current = ""
self.newnumber = True
self.operation = ""
self.equal = False
def PressedNumber(self, number):
self.equal = False
t = text_box.get()
n = str(number)
if self.newnumber:
self.current = n
self.newnumber = False
else:
if n == '.':
if n in t:
return
self.current = t + n
self.Display(self.current)
def TotalCalculated(self):
self.equal = True
self.current = float(self.current)
if self.operation_pending == True:
self.calc_sum()
else:
self.total = float(text_box.get())
def Display(self, value):
text_box.delete(0, END)
text_box.insert(0, value)
def calc_sum(self):
if self.operation == "subtract":
self.total -= self.current
if self.operation == "add":
self.total += self.current
if self.operation == "divide":
self.total /= self.current
if self.operation == "multiply":
self.total *= self.current
self.newnumber = True
self.operation_pending = False
self.Display(self.total)
def operation(self, operation):
self.current = float(self.current)
if self.operation_pending:
self.calc_sum()
elif not self.equal:
self.total = self.current
self.newnumber = True
self.operation_pending = True
self.operation = operation
self.equal = False
def cancel(self):
self.equal = False
self.current = "0"
self.Display(0)
self.newnumber = True
def Cancelation_forEverything(self):
self.cancel()
self.total = 0
def sign(self):
self.equal = False
self.current = -(float(text_box.get()))
self.Display(self.current)
summ = Calculator()
root = Tk()
Calculator = Frame(root)
Calculator.grid()
root.title("Calculator")
root.configure(bg="Khaki")
root.minsize(width=220, height=20)
root.resizable(width=FALSE, height= FALSE)
text_box = Entry(Calculator, justify=RIGHT)
text_box.grid(row = 0, column = 0, columnspan=3, pady = 8, sticky=W+E)
text_box.insert(0, "0")
Numbers = "789456123"
a = 0
bttn = []
for r in range(1,4):
for c in range(3):
bttn.append(Button(Calculator, text = Numbers[a], font="Candara,20"))
bttn[a].grid(row = r, column = c, padx= 15, pady = 15)
bttn[a]["command"] = lambda x = Numbers[a]: summ.PressedNumber(x)
a += 1
bttn_0 = Button(Calculator, text = " 0 ", font="Candara,20")
bttn_0["command"] = lambda: summ.PressedNumber(0)
bttn_0.grid(columnspan = 5, sticky=N+W, padx= 20, pady = 20)
bttn_division = Button(Calculator, text = chr(247), font="Candara,20")
bttn_division["command"] = lambda: summ.operation("divide")
bttn_division.grid(row = 1, column = 3, pady = 10)
bttn_multiply = Button(Calculator, text = "x", font="Candara,20")
bttn_multiply["command"] = lambda: summ.operation("multiply")
bttn_multiply.grid(row = 2, column = 3, sticky=N, pady = 10)
bttn_subtract = Button(Calculator, text = "-", font="Candara,20")
bttn_subtract["command"] = lambda: summ.operation("subtract")
bttn_subtract.grid(row = 3, column = 3, pady = 10)
bttn_point = Button(Calculator, text = ".", font="Candara,20")
bttn_point["command"] = lambda: summ.PressedNumber(".")
bttn_point.grid(row = 4, column = 1, padx = 10, pady = 10)
bttn_addition = Button(Calculator, text = "+", font="Candara,20")
bttn_addition["command"] = lambda: summ.operation("add")
bttn_addition.grid(row = 4, column = 3, pady = 10)
bttn_neg = Button(Calculator, text = "+/-", font="Candara,20")
bttn_neg["command"] = summ.sign
bttn_neg.grid(row = 5, column = 0, pady = 10)
clear = Button(Calculator, text = "C", font="Candara,20")
clear["command"] = summ.cancel
clear.grid(row = 5, column = 1, pady = 10)
all_clear = Button(Calculator, text = "AC", font="Candara,20")
all_clear["command"] = summ.Cancelation_forEverything
all_clear.grid(row = 5, column = 2, pady = 10)
equals = Button(Calculator, text = "=", font="Candara,20")
equals["command"] = summ.TotalCalculated
equals.grid(row = 5, column = 3, pady = 10)
root.mainloop()
一旦我添加了颜色代码,计算符号就无法工作并给我一个错误...这是我按下其中一个计算符号时的错误消息:
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python27\lib\lib-tk\Tkinter.py", line 1532, in __call__
return self.func(*args)
File "C:\Users\HANY\Documents\Nona CS\Calculator3.py", line 108, in <lambda>
bttn_multiply["command"] = lambda: summ.operation("multiply")
TypeError: 'str' object is not callable
谁能告诉我该怎么做才能使代码正常工作?
我认为问题在于您在计算器 class 中将 operation
定义为字符串变量:
self.operation = ""
但是你也把它定义为一个方法:
def operation(self, operation)
因此,当您 summ.operation("multiply")
python 调用字符串变量时,而不是方法。当然,这会导致字符串不可调用的错误。
#Calculator codes
from Tkinter import*
class Calculator():
def __init__ (self):
self.total = 0
self.current = ""
self.newnumber = True
self.operation = ""
self.equal = False
def PressedNumber(self, number):
self.equal = False
t = text_box.get()
n = str(number)
if self.newnumber:
self.current = n
self.newnumber = False
else:
if n == '.':
if n in t:
return
self.current = t + n
self.Display(self.current)
def TotalCalculated(self):
self.equal = True
self.current = float(self.current)
if self.operation_pending == True:
self.calc_sum()
else:
self.total = float(text_box.get())
def Display(self, value):
text_box.delete(0, END)
text_box.insert(0, value)
def calc_sum(self):
if self.operation == "subtract":
self.total -= self.current
if self.operation == "add":
self.total += self.current
if self.operation == "divide":
self.total /= self.current
if self.operation == "multiply":
self.total *= self.current
self.newnumber = True
self.operation_pending = False
self.Display(self.total)
def operation(self, operation):
self.current = float(self.current)
if self.operation_pending:
self.calc_sum()
elif not self.equal:
self.total = self.current
self.newnumber = True
self.operation_pending = True
self.operation = operation
self.equal = False
def cancel(self):
self.equal = False
self.current = "0"
self.Display(0)
self.newnumber = True
def Cancelation_forEverything(self):
self.cancel()
self.total = 0
def sign(self):
self.equal = False
self.current = -(float(text_box.get()))
self.Display(self.current)
summ = Calculator()
root = Tk()
Calculator = Frame(root)
Calculator.grid()
root.title("Calculator")
root.configure(bg="Khaki")
root.minsize(width=220, height=20)
root.resizable(width=FALSE, height= FALSE)
text_box = Entry(Calculator, justify=RIGHT)
text_box.grid(row = 0, column = 0, columnspan=3, pady = 8, sticky=W+E)
text_box.insert(0, "0")
Numbers = "789456123"
a = 0
bttn = []
for r in range(1,4):
for c in range(3):
bttn.append(Button(Calculator, text = Numbers[a], font="Candara,20"))
bttn[a].grid(row = r, column = c, padx= 15, pady = 15)
bttn[a]["command"] = lambda x = Numbers[a]: summ.PressedNumber(x)
a += 1
bttn_0 = Button(Calculator, text = " 0 ", font="Candara,20")
bttn_0["command"] = lambda: summ.PressedNumber(0)
bttn_0.grid(columnspan = 5, sticky=N+W, padx= 20, pady = 20)
bttn_division = Button(Calculator, text = chr(247), font="Candara,20")
bttn_division["command"] = lambda: summ.operation("divide")
bttn_division.grid(row = 1, column = 3, pady = 10)
bttn_multiply = Button(Calculator, text = "x", font="Candara,20")
bttn_multiply["command"] = lambda: summ.operation("multiply")
bttn_multiply.grid(row = 2, column = 3, sticky=N, pady = 10)
bttn_subtract = Button(Calculator, text = "-", font="Candara,20")
bttn_subtract["command"] = lambda: summ.operation("subtract")
bttn_subtract.grid(row = 3, column = 3, pady = 10)
bttn_point = Button(Calculator, text = ".", font="Candara,20")
bttn_point["command"] = lambda: summ.PressedNumber(".")
bttn_point.grid(row = 4, column = 1, padx = 10, pady = 10)
bttn_addition = Button(Calculator, text = "+", font="Candara,20")
bttn_addition["command"] = lambda: summ.operation("add")
bttn_addition.grid(row = 4, column = 3, pady = 10)
bttn_neg = Button(Calculator, text = "+/-", font="Candara,20")
bttn_neg["command"] = summ.sign
bttn_neg.grid(row = 5, column = 0, pady = 10)
clear = Button(Calculator, text = "C", font="Candara,20")
clear["command"] = summ.cancel
clear.grid(row = 5, column = 1, pady = 10)
all_clear = Button(Calculator, text = "AC", font="Candara,20")
all_clear["command"] = summ.Cancelation_forEverything
all_clear.grid(row = 5, column = 2, pady = 10)
equals = Button(Calculator, text = "=", font="Candara,20")
equals["command"] = summ.TotalCalculated
equals.grid(row = 5, column = 3, pady = 10)
root.mainloop()
一旦我添加了颜色代码,计算符号就无法工作并给我一个错误...这是我按下其中一个计算符号时的错误消息:
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python27\lib\lib-tk\Tkinter.py", line 1532, in __call__
return self.func(*args)
File "C:\Users\HANY\Documents\Nona CS\Calculator3.py", line 108, in <lambda>
bttn_multiply["command"] = lambda: summ.operation("multiply")
TypeError: 'str' object is not callable
谁能告诉我该怎么做才能使代码正常工作?
我认为问题在于您在计算器 class 中将 operation
定义为字符串变量:
self.operation = ""
但是你也把它定义为一个方法:
def operation(self, operation)
因此,当您 summ.operation("multiply")
python 调用字符串变量时,而不是方法。当然,这会导致字符串不可调用的错误。