[Tutor] Getting the real exception clause

[Mark Lawrence]

On 16/06/2013 21:26, Jim Mooney wrote:
> '''I'm using general Exception to print out what the exception is
> until I learn them, but
> it will print out "[Errno 2] No such file or directory" in this case,
> when the real
> exception I'd need to use in an except clause is FileNotFoundError.
> How do I get the
> exception I need to use in the except clause from the more English-like message?
> '''
>
> #Using C:\Python33\python.exe on Win 7 in c:\python33\jimprogs
> try:
>      fh = open('nosuchdirectory/text/truthyfalsey.txt')
>      for line in fh:
>          print(line,end='')
>      fh.close()
> except Exception as err:
>      print(err)
>
> Jim
> After indictment the bacon smuggler was put on the no-fry list

Easy, strip out the exception handling you have above.

c:\Users\Mark\MyPython>type a.py
with open('nosuchdirectory/text/truthyfalsey.txt') as fh:
     for line in fh:
         print(line,end='')

c:\Users\Mark\MyPython>a
Traceback (most recent call last):
   File "C:\Users\Mark\MyPython\a.py", line 1, in <module>
     with open('nosuchdirectory/text/truthyfalsey.txt') as fh:
FileNotFoundError: [Errno 2] No such file or directory: 
'nosuchdirectory/text/truthyfalsey.txt'

A slight aside, note I've used the 'with' clause so there's no need to 
explicity close the file, good ole Python does it for you.

-- 
"Steve is going for the pink ball - and for those of you who are 
watching in black and white, the pink is next to the green." Snooker 
commentator 'Whispering' Ted Lowe.

Mark Lawrence