[英]Python - My class raise ValueError, but it is not handled by except
我的示例代碼:
from tkinter import *
class first:
def __init__(self):
self.top = Tk()
...
def test(self):
try:
self.value = self.dict[key]
except KeyError:
try:
second()
except ValueError:
print('Finally')
class second:
def __init__(self):
self.frame = Toplevel()
...
self.button = ttk.Button(parent=self.frame, text='GO', command=self.go_click)
...
def go_click(self):
raise ValueError('Not Valid')
那只是一個例子! 問題是ValueError由第二個類引發,但沒有由第一類的except子句處理。 下面的回溯:
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python34\lib\tkinter\__init__.py", line 1487, in __call__
return self.func(*args)
File "........", line xxx, in goclick
raise ValueError('Not Valid')
ValueError: Not Valid
我該如何正確處理?
謝謝,
嘗試這個
from tkinter import *
class first:
def __init__(self):
self.top = Tk()
...
def test(self):
try:
self.value = self.dict[key]
except KeyError:
try:
second()
except ValueError:
print('Finally')
print "OK CALLED SECOND()!!!!" #######THIS PRINT MEANS YOUR DONE HERE
class second:
def __init__(self):
self.frame = Toplevel()
...
self.button = ttk.Button(parent=self.frame, text='GO', command=self.go_click)
...
def go_click(self):
raise ValueError('Not Valid')
為了實際處理該錯誤,您需要重寫tkinters事件循環...不太容易(或一般情況下的良好做法)
更好的方法是處理go_click
函數中的錯誤,其自身類似於
def go_click(self):
try:
self.submit_form()
except ValueError:
print "VALIDATION ERROR!!"
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