I am trying to understand the with
statement. I understand that it is supposed to replace the try
/except
block.
Now suppose I do something like this:
try:
name = "rubicon" / 2 # to raise an exception
except Exception as e:
print("No, not possible.")
finally:
print("OK, I caught you.")
How do I replace this with a context manager?
with
doesn't really replace try
/except
, but, rather, try
/finally
. Still, you can make a context manager do something different in exception cases from non-exception ones:
class Mgr(object):
def __enter__(self): pass
def __exit__(self, ext, exv, trb):
if ext is not None: print "no not possible"
print "OK I caught you"
return True
with Mgr():
name='rubicon'/2 #to raise an exception
The return True
part is where the context manager decides to suppress the exception (as you do by not re-raising it in your except
clause).