Python Tkinter文本小部件.get方法错误

Question

我对Python还是很陌生，有点喜欢Dive into Python 2，并且想涉足一些Tkinter编程。 我试图制作一个小程序，该程序需要3个单词集，并在3个单词集中组合每个单词，以构成网站的关键字。 运行脚本时，GUI会按预期显示，但是单击“创建组合”按钮时出现以下错误

Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python2.6/lib-tk/Tkinter.py", line 1413, in __call__
    return self.func(*args)
  File "combomaker.py", line 34, in makeCombinations
    primaryraw = primaryKeyWordsBox.get()
AttributeError: 'NoneType' object has no attribute 'get'

我正在尝试修复的代码

#!/usr/bin/env python
from Tkinter import *

primaryKeyWordsLabel = None
primaryKeyWordsBox = None
secondaryKeyWordsLabel = None
secondaryKeyWordsBox = None
tertiaryKeyWordsLabel = None
tertiaryKeyWordsBox = None

class Application(Frame):
 def __init__(self, master=None, padx = 10, pady= 10):
  Frame.__init__(self, master)
  self.grid()
  self.createWidgets()

 def createWidgets(self):
  self.primaryKeyWordsLabel = LabelFrame(text="Primary Key Words", padx=10, pady=10)
  self.primaryKeyWordsLabel.grid()
  self.primaryKeyWordsBox = Text(primaryKeyWordsLabel, autoseparators=True, height=5, undo=True)
  self.primaryKeyWordsBox.grid()
  self.secondaryKeyWordsLabel = LabelFrame(text="Secondary Key Words", padx=10, pady=10)
  self.secondaryKeyWordsLabel.grid()
  self.secondaryKeyWordsBox = Text(secondaryKeyWordsLabel, autoseparators=True, height=5, undo=True)
  self.secondaryKeyWordsBox.grid()
  self.tertiaryKeyWordsLabel = LabelFrame(text="Tertiary Key Words", padx=10, pady=10)
  self.tertiaryKeyWordsLabel.grid()
  self.tertiaryKeyWordsBox = Text(tertiaryKeyWordsLabel, autoseparators=True, height=5, undo=True)
  self.tertiaryKeyWordsBox.grid()
  self.goButton = Button(text="Create Combinations", command=makeCombinations)
  self.goButton.grid()

def makeCombinations():
  primaryraw = primaryKeyWordsBox.get()
  primary = primaryraw.split(', ')
  secondaryraw = secondaryKeyWordsBox.get()
  secondary = secondaryraw.split(', ')
  tertiaryraw = tertiaryKeyWordsBox.get()
  tertiary = tertiaryraw.split(', ')
  output=[]
  filename = "output.txt" 
  for i in range(len(primary)):
   for j in range(len(secondary)):
    for k in range(len(tertiary)):
     rawcombo=str(primary[i])+" "+str(secondary[j])+" "+str(tertiary[k])
     output.append(rawcombo)
  FILE = open(filename, w)
  for combo in output:
   FILE.write(combo+",\n")
  FILE.close()
app = Application()                    
app.master.title("Keyword Generator") 
app.mainloop()    

我可能太投入GUI编程了，这是我在任何GUI工作中的第一次尝试，但不是我的第一次编程。
提前谢谢了 ：）

Answer 1

您正在尝试访问

primaryKeyWordsBox

（免费）函数makeCombinations(..)类Application之外。

通过像其他成员函数一样缩进makeCombinations(..)可以使其makeCombinations(..) Application的成员，并添加self参数：

 def makeCombinations(self):

您应该修改makeCombinations(..)与按钮的绑定：

...,command = self.makeCombinations)

然后，您必须添加self. 当您尝试访问此类的成员时：

 primaryraw = self.primaryKeyWordsBox.get(1.0,END)
 ...
 secondaryraw = self.secondaryKeyWordsBox.get(1.0,END)
 ...
 tertiaryraw = self.tertiaryKeyWordsBox.get(1.0,END)

（我发现示例如何使用get 这里 ）。

如果要打开文件进行写入，则应该执行以下操作：

 FILE = open(filename, "w")

代替

 FILE = open(filename, w)