python - python计算器程序中的AttributeError或ImportError

Question

我正在用 python 编写一个计算器程序，但我不断收到错误消息AttributeError:“应用程序”对象没有属性“response_txt”

from tkinter import *




class Application(Frame):
""" GUI application calculator. """ 
def __init__(self, master):
    """ Initialize the frame. """
    super(Application, self).__init__(master)  

    # Adds the grid layout manager
    self.grid()

    # The result string
    self.response_str = ""

    #sets up the controls in the frame
    self.create_widgets()

def create_widgets(self):
    """ Create and sequence """

    #Text Sequence
    self.sequence_txt = Text(self, height = 1, width = 30, wrap=WORD)
    self.sequence_txt.grid(row = 0, column = 0, columnspan = 2)

    # Configure the Text to center
    self.sequence_txt.tag_config("center_align", justify='center')

    # Configure the Text to center
    self.response_txt.tag_config("center_align", justify='center')

    ###buttons
    # Button 1
    Button(self,
           bg='1',
           command = self.one_btn_clicked,
           height = 2
           ).grid(row = 2, column = 0, sticky = NSEW)

#buttons clicked
def one_btn_clicked(self):
    """This method is run when the one button gets clicked"""
    #append a 1
    self.response_str+="1"
    #update text
    self.response_txt.delete(0.0, END)
    self.response_txt.insert(0.0, self.response_str, "center_align")
    #add number
    self.compare_sequences();
#main
root = Tk()
root.title("Calculator")
app = Application(root)
root.mainloop()

当我通过模块运行它时，它给了我这个错误:

AttributeError: 'Application' object has no attribute 'response_txt'

我尝试导入这样的子模块:

`import self.response_txt`

然后它给了我这个错误消息:

ImportError: No module named 'self'

我真的需要这个来工作，明天就要交作业了。任何想法都表示赞赏，我对编程非常陌生。我也知道该程序还没有真正完成，但在我进行任何其他步骤之前，我需要确保我在这里所做的事情首先能够发挥作用。谢谢。

Answer 1

您忘记初始化 self.response_txt。此外，“1”不是代码中 bg 的有效参数:

Button(self,
           bg='1',
           command = self.one_btn_clicked,
           height = 2
           ).grid(row = 2, column = 0, sticky = NSEW)

更正的代码:

from tkinter import *




class Application(Frame):
    """ GUI application calculator. """ 
    def __init__(self, master):
        """ Initialize the frame. """
        super(Application, self).__init__(master)  

        # Adds the grid layout manager
        self.grid()

        # The result string
        self.response_str = ""

        #sets up the controls in the frame
        self.create_widgets()

    def create_widgets(self):
        """ Create and sequence """

        #Text Sequence
        self.sequence_txt = Text(self, height = 1, width = 30, wrap=WORD)
        self.sequence_txt.grid(row = 0, column = 0, columnspan = 2)
        self.response_txt = Text(self, height = 1, width = 30, wrap=WORD)
        self.response_txt.grid(row = 0, column = 0, columnspan = 2)
        # Configure the Text to center
        self.sequence_txt.tag_config("center_align", justify='center')

        # Configure the Text to center
        self.response_txt.tag_config("center_align", justify='center')

        ###buttons
        # Button 1
        Button(self,
               bg='white',
               command = self.one_btn_clicked,
               height = 2
               ).grid(row = 2, column = 0, sticky = NSEW)

    #buttons clicked
    def one_btn_clicked(self):
        """This method is run when the one button gets clicked"""
        #append a 1
        self.response_str+="1"
        #update text
        self.response_txt.delete(0.0, END)
        self.response_txt.insert(0.0, self.response_str, "center_align")
        #add number
        self.compare_sequences();
#main
root = Tk()
root.title("Calculator")
app = Application(root)
root.mainloop()

此外，您还没有创建compare_sequences函数。