python 入口小部件元组组合

Question

我一直在尝试将条目小部件与 python 2.7 tkinter 中的元组结合起来。使用此代码，我应该能够输入水果的名称，在水果碗元组中搜索它，如果它在其中，则使用一组单选按钮显示该水果的特征。

from Tkinter import*

class Fruit:
    def __init__(self, parent):

        # variables
        self.texture_option = StringVar()
        self.climate_option = StringVar()

        # layout
        self.myParent = parent

        self.main_frame = Frame(parent, background="light blue")
        self.main_frame.pack(expand=YES, fill=BOTH)

        texture_options = ["Soft", "Crunchy","?"]
        climate_options = ["Temperate", "Tropical","?"]

        self.texture_option.set("?")
        self.climate_option.set("?")

        self.texture_options_frame = Frame(self.main_frame, borderwidth=3, background="light blue")
        self.texture_options_frame.pack(side=TOP, expand=YES, anchor=W)
        Label(self.texture_options_frame, text="Texture:", relief=FLAT, font="bold", background="light blue").pack(side=LEFT,anchor=W)
        for option in texture_options:
            button = Radiobutton(self.texture_options_frame, text=str(option), indicatoron=0,
            value=option, padx=5, variable=self.texture_option, background="light blue")
            button.pack(side=LEFT)

        self.climate_options_frame = Frame(self.main_frame, borderwidth=3, background="light blue")
        self.climate_options_frame.pack(side=TOP, expand=YES, anchor=W)
        Label(self.climate_options_frame, text="Climate:", relief=FLAT, font="bold", background="light blue").pack(side=LEFT,anchor=W)
        for option in climate_options:
            button = Radiobutton(self.climate_options_frame, text=str(option), indicatoron=0,
            value=option, padx=5, variable=self.climate_option, background="light blue")
            button.pack(side=LEFT)

        #search button
        self.search_frame = Frame(self.main_frame, borderwidth=5, height=50, background="light blue")
        self.search_frame.pack(expand=NO)

        enter = Entry(self.search_frame, width=30).pack(side=LEFT, expand=NO, padx=5, pady=5, ipadx=5, ipady=5)

        self.searchbutton = Button(self.search_frame, text="Search", foreground="white", background="blue",
        width=6, padx="2m", pady="1m")
        self.searchbutton.pack(side=LEFT, pady=5)
        self.searchbutton.bind("<Button-1>", self.searchbuttonclick)
        self.searchbutton.bind("<Return>", self.searchbuttonclick)


    def searchbuttonclick(self,event):
        #fruit  texture  climate 
        fruit_bowl=[
        ('Apple', 'Crunchy','Temperate'),
        ('Orange', 'Soft','Tropical'),
        ('Pawpaw','Soft','Temperate')]

        if enter.get()==fruit_bowl[x][0]:
            self.texture_option.set()==fruit_bowl[x][1]
            self.climate_option.set()==fruit_bowl[x][2]

root = Tk()
root.title("Fruit Bowl")
fruit = Fruit(root)
root.mainloop()

我收到一条错误消息，名称错误:未定义全局名称“enter”。有谁知道为什么这不起作用？

Answer 1

问题是你在对象的一个​​方法中本地定义了“enter”变量，然后尝试在另一种方法中访问它 - 它不作为局部变量存在(因此Python将其作为全局变量搜索，并且由于它没有找到它，它会引发您看到的消息错误)。

很容易修复:只需将 Enter 变量设置为“Fruit”类的属性，在使用它的任何地方都使用 self. 前缀 - 这样它将可供所有人使用你的对象的方法 -

即，更改此行:

enter = Entry(self.search_frame, width=30).pack(side=LEFT, Expand=NO, padx=5, pady=5, ipadx=5, ipady=5)

至:

self.enter = Entry(self.search_frame, width=30).pack(side=LEFT, Expand=NO, padx=5, pady=5, ipadx=5, ipady=5)

和

if Enter.get()==fruit_bowl[x][0]:到if self.enter.get()==fruit_bowl[x][0]: