python raise exception

1raise Exception("message")

1raise Exception('I know Python!') # Don't! If you catch, likely to hide bugs.
2

1try:
2  # Dangerous stuff
3except ValueError:
4  # If you use try, at least 1 except block is mandatory!
5  # Handle it somehow / ignore
6except (BadThingError, HorrbileThingError) as e:
7  # Hande it differently
8except:
9  # This will catch every exception.
10else:
11  # Else block is not mandatory.
12  # Dangerous stuff ended with no exception
13finally:
14  # Finally block is not mandatory.
15  # This will ALWAYS happen after the above blocks.

1>>> def catch():
2...     try:
3...         asd()
4...     except Exception as e:
5...         print e.message, e.args
6... 
7>>> catch()
8global name 'asd' is not defined ("global name 'asd' is not defined",)

1#raise exception
2raise ValueError('A very specific bad thing happened.')

1	# this raises a "NameError"
2
3>>> raise NameError('HiThere')
4
5Traceback (most recent call last):
6  File "<stdin>", line 1, in <module>
7NameError: HiThere