try/except/else

blah.py

#------------------------
#in else block
try:
	obj = db.create_obj():
except DBExploded as e:
	pass
else:
	#obj is guarenteed to be valid object
	obj.do_something()
	obj.save()


#------------------------
#not in else block
try:
	obj = db.create_obj():
except DBExploded as e:
	pass
#obj might not be valid object
obj.do_something()
obj.save()



#------------------------
# all in try block
try:
	obj = db.create_obj():
	obj.do_something()
	obj.save()
except DBExploded as e:
	# no idea if exploded on create_obj() or do_something() or save()
	pass

------------------------

in else block

try:
obj = db.create_obj():
except DBExploded as e:
fail, return
else:
#obj is guarenteed to be valid object
obj.do_something()
obj.save()

------------------------

not in else block

try:
obj = db.create_obj():
except DBExploded as e:
fail, return

obj is guarenteed to be valid object

obj.do_something()
obj.save()