I am just being curious about the syntax of python exceptions as I can't seem to understand when you are suppossed to use the syntax below to catch an exception.
try:
"""
Code that can raise an exception...
"""
except Exception as e:
pass
and
try:
"""
Code that can raise an exception...
"""
except Exception, e:
pass
What is the difference?
Note: As Martijn points out, comma variable form is deprecated in Python 3.x. So, its always better to use as form.
As per http://docs.python.org/2/tutorial/errors.html#handling-exceptions
except Exception, e:
is equivalent to
except Exception as e:
Commas are still used when you are catching multiple exceptions at once, like this
except (NameError, ValueError) as e:
Remember, the parentheses around the exceptions are mandatory when catching multiple exceptions.
as was introduced to replace the comma. It was confusing as hell when multiple exceptions were being caught. Use except (NameError, ValueError) as e: there.
except NameError, ValueError: and wonder why it didn't work, or use except (NameError, e): and wonder why you still got a NameError on e.except Exception, e is deprecated in Python 3.
The proper form is:
try:
...
except Exception as e:
...
