[Tutor] errno module - was File copying - best way?

[Kalle Svensson]

Sez fleet@teachout.org:
> 
> I will study this and look at the rest of the exceptions listed for 'os;'
> but what about the 'errno' module?

The errno module is used for mapping a error code set by a failed C system
call to a name and the other way around:

>>> try:
...   f = open("/usr/testfile", "w")
... except IOError, e:
...   pass
... 
>>> e
<exceptions.IOError instance at 0x81103a4>
>>> dir(e)
['args', 'errno', 'filename', 'strerror']
>>> errno.errorcode[e.errno]
'EACCES'
>>> errno.EACCES
13
>>> errno.EACCES == e.errno
1
>>> print e
[Errno 13] Permission denied: '/usr/testfile'
>>> 

Peace,
  Kalle
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