Python 类对象没有属性tk?
我对python相当陌生,在教程的帮助下,我试图创建一个计算器,但由于按下数字按钮时出现的一个错误,我无法纠正,因此被卡住了Python 类对象没有属性tk?,python,tkinter,python-3.4,Python,Tkinter,Python 3.4,我对python相当陌生,在教程的帮助下,我试图创建一个计算器,但由于按下数字按钮时出现的一个错误,我无法纠正,因此被卡住了 from tkinter import * root=Tk() root.title("Yuvi's CAl") global char class cal(): def __init__(self): self.string= StringVar() root=Tk() root.title("Yuvi's C
from tkinter import *
root=Tk()
root.title("Yuvi's CAl")
global char
class cal():
def __init__(self):
self.string= StringVar()
root=Tk()
root.title("Yuvi's CAl")
self.string=StringVar
enter=Entry(root,textvariable=self.string)
enter.grid(row=0,column=0,columnspan=6)
values=["1","2","3","4","5","+","6","7","=","8","9","c"]
row=1
col=0
i=0
for txt in values:
if i==3:
row=3
col=0
if i==6:
row=4
col=0
if i==9:
row=5
col=0
if txt=="+":
but=Button(root,text=txt)
but.grid(row=row,column=col)
elif txt=="=":
but=Button(root,text=txt,command=lambda:self.equals)
but.grid(row=row,column=col)
elif txt=="c":
but=Button(root,text=txt,command=lambda:self.clr)
but.grid(row=row,column=col)
else:
but=Button(root,text=txt,command=lambda txt=txt:self.add(txt))
but.grid(row=row,column=col)
col+=1
i+=1
def add(self,char):
meet=self.string.get(self)
self.string.set((str(meet)) + (str(char)))
def equals(self):
result=eval(self.string.get())
self.string.set(result)
def clr(self):
self.string.set("")
ent=cal()
root.mainloop()
Traceback (most recent call last):
File "/usr/lib/python3.4/tkinter/__init__.py", line 1541, in __call__
return self.func(*args)
File "/home/yuvi/Documents/LiClipse Workspace/GUI/src/Misiio_calcuator.py", line 40, in <lambda>
but=Button(root,text=txt,command=lambda txt=txt:self.add(txt))
File "/home/yuvi/Documents/LiClipse Workspace/GUI/src/Misiio_calcuator.py", line 46, in add
meet=self.string.get(self)
File "/usr/lib/python3.4/tkinter/__init__.py", line 339, in get
value = self._tk.globalgetvar(self._name)
AttributeError: 'cal' object has no attribute '_tk'
这就是我按数字键时的错误
from tkinter import *
root=Tk()
root.title("Yuvi's CAl")
global char
class cal():
def __init__(self):
self.string= StringVar()
root=Tk()
root.title("Yuvi's CAl")
self.string=StringVar
enter=Entry(root,textvariable=self.string)
enter.grid(row=0,column=0,columnspan=6)
values=["1","2","3","4","5","+","6","7","=","8","9","c"]
row=1
col=0
i=0
for txt in values:
if i==3:
row=3
col=0
if i==6:
row=4
col=0
if i==9:
row=5
col=0
if txt=="+":
but=Button(root,text=txt)
but.grid(row=row,column=col)
elif txt=="=":
but=Button(root,text=txt,command=lambda:self.equals)
but.grid(row=row,column=col)
elif txt=="c":
but=Button(root,text=txt,command=lambda:self.clr)
but.grid(row=row,column=col)
else:
but=Button(root,text=txt,command=lambda txt=txt:self.add(txt))
but.grid(row=row,column=col)
col+=1
i+=1
def add(self,char):
meet=self.string.get(self)
self.string.set((str(meet)) + (str(char)))
def equals(self):
result=eval(self.string.get())
self.string.set(result)
def clr(self):
self.string.set("")
ent=cal()
root.mainloop()
Traceback (most recent call last):
File "/usr/lib/python3.4/tkinter/__init__.py", line 1541, in __call__
return self.func(*args)
File "/home/yuvi/Documents/LiClipse Workspace/GUI/src/Misiio_calcuator.py", line 40, in <lambda>
but=Button(root,text=txt,command=lambda txt=txt:self.add(txt))
File "/home/yuvi/Documents/LiClipse Workspace/GUI/src/Misiio_calcuator.py", line 46, in add
meet=self.string.get(self)
File "/usr/lib/python3.4/tkinter/__init__.py", line 339, in get
value = self._tk.globalgetvar(self._name)
AttributeError: 'cal' object has no attribute '_tk'
回溯(最近一次呼叫最后一次):
文件“/usr/lib/python3.4/tkinter/\uuuuu init\uuuuuu.py”,第1541行,在调用中__
返回self.func(*args)
文件“/home/yuvi/Documents/LiClipse Workspace/GUI/src/Misiio_calculator.py”,第40行,在
但是=按钮(root,text=txt,command=lambda-txt=txt:self.add(txt))
文件“/home/yuvi/Documents/LiClipse Workspace/GUI/src/Misiio_calculator.py”,第46行,添加
meet=self.string.get(self)
get中第339行的文件“/usr/lib/python3.4/tkinter/_init__.py”
value=self.\u tk.globalgetvar(self.\u name)
AttributeError:“cal”对象没有属性“\u tk”
如果有错误,一定要改正
提前感谢您您的代码有几个问题。首先,您应该删除在
\uuuu init\uuuu
中隐藏全局变量,因为它会创建两个窗口,并且只为其中一个窗口运行mainloop
。此外,在首次创建类对象的实例之后,可以使用类对象覆盖self.string
。所以你的\uuuuu init\uuuuuu
看起来是这样的
...
def __init__(self):
self.string=StringVar()
enter=Entry(root,textvariable=self.string)
enter.grid(row=0,column=0,columnspan=6)
values=["1","2","3","4","5","+","6","7","=","8","9","c"]
row=1
col=0
i=0
...
然后在您的添加中,您不必将self
传递给self.string.get
,也就是说
...
def add(self,char):
meet=self.string.get()
self.string.set((str(meet)) + (str(char)))
...
这些更改修复了您的异常,但我想计算器中还有其他逻辑错误,但这不是问题所在,修复这些错误不会帮助您学习python