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我正在尝试用 Python 创建一个拼字游戏。我想在用户输入单词时显示该单词的价值。我已经问过这个问题，因为我不知道使用什么方法。当我发现使用哪种方法时，我的问题是关于如何使用这种方法，我认为这值得提出一个新问题。我的问题是我创建了一个名为的函数，该函数bind_entry(event)应该在用户每次输入字母时设置一个标签。但是该函数bind_entry(event)不知道要设置的标签和单词所在的条目。

这是我的代码：

#this the function creating the label
def create_variabletext_intlabel(root,col,row):
    val=IntVar()
    label=Label(root,textvariable=val)
    label.grid(column=col,row=row)
    return val, label

#this is the function creating the entry
def create_entry_string(root,width,col,row,columnspan,rowspan):
    val=StringVar()
    entry=ttk.Entry(root,width=width,textvariable=val)
    entry.grid(column=col,row=row,columnspan=columnspan,rowspan=rowspan)
    entry.bind("<Any-KeyPress>",bind_entry)
    #Here is my problem, when I call the function bind_entry.
    return val, entry

def bind_entry(event):
    label.set(m.counting_point(char(event))) 
    # m.counting_point() is a function counting the word's points
    # my problem is that the function doesn't know yet the label. 
    # I don't know how to call the label. 

# I call the function create_entry_string in another file initiating
# all the widget for the GUI
val_entry_word, entry_word =g.create_entry_string(root,15,1,1,1,1)

# I call the function create_variabletext_intlabel in another file
# initiating all the widget for the GUI
val_points,label_points=g.create_variabletext_intlabel(root,1,2)

我刚刚注意到该函数m.counting_points()将仅计算用户键入的字母。在这里我应该打电话val_entry_word。

所以这是我的问题：

As val_entry_wordand val_pointsare created in an function in another file 我怎么能在函数中调用val_entry_word和？val_pointsbind_entry()

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1 回答 1

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通常，当您需要不同的函数调用来共享信息而不显式传递信息时，最佳实践是使用类。

例如

class LabelUpdater(object):
    def create_variabletext_intlabel(self,root,col,row):
        val=IntVar()
        self.label=label=Label(root,textvariable=val)
        label.grid(column=col,row=row)
        return val, label

    #this is the function creating the entry
    def create_entry_string(self,root,width,col,row,columnspan,rowspan):
        val=StringVar()
        entry=ttk.Entry(root,width=width,textvariable=val)
        entry.grid(column=col,row=row,columnspan=columnspan,rowspan=rowspan)
        entry.bind("<Any-KeyPress>",self.bind_entry)
        #Here is my problem, when I call the function bind_entry.
        return val, entry

     def bind_entry(self,event):
        self.label.set(m.counting_point(char(event))) 

#At this point, I don't understand your code anymore since I don't know what g
#is or how it's create_entry_string method calls your create_entry_string function...
#I'll assume that the module where g's class is defined imports this file...
#If that's how it works, then the following may be ok, although probably not because
#of circular imports...

container=LabelUpdater()
create_variabletext_intlabel=container.create_variabletext_intlabel
create_entry_string=container.create_entry_string

val_entry_word, entry_word =g.create_entry_string(root,15,1,1,1,1) #somehow calls create_variabletext_intlabel which is mapped to container.create_variable_intlabel???

# I call the function create_variabletext_intlabel in another file
# initiating all the widget for the GUI
val_points,label_points=g.create_variabletext_intlabel(root,1,2)

当然，您也可以使用全局变量...（尽管绝对不鼓励这样做）

最后，我经常用来在绑定回调中添加附加信息的习惯用法是将回调函数包装在另一个函数中......

def myfunc(root):
    label=Label(root,text="cow")
    label.pack()
    return label

#This is the callback we want...
#  Q: but how do we pass S? 
#  A: we need to wrap this call in another -- a perfect use for lambda functions!
def change_label(label,S):
    label.config(text=S)

root=Tk()
lbl=myfunc(root)
lbl.bind("<Enter>",lambda e: change_label("Horse"))
lbl.bind("<Leave>",lambda e: change_label("Cow"))
于 2012-04-23T12:34:27.443 回答