python catch exception and continue try block

Question

Can I return to executing try-block after exception occurs   The goal is to write less  For Example   try      do smth1   except      pass  try      do smth2   except      pass   vs  try      do smth1       do smth2   except            magic word to proceed to do smth2   if there was exception in do smth1

User · Answer

one way you could handle this is with a generator. Instead of calling the function, yield it; then whatever is consuming the generator can send the result of calling it back into the generator, or a sentinel if the generator failed: The trampoline that accomplishes the above might look like so:

def consume_exceptions(gen):
    action = next(gen)
    while True:
        try:
            result = action()
        except Exception:
            # if the action fails, send a sentinel
            result = None

        try:
            action = gen.send(result)
        except StopIteration:
            # if the generator is all used up, result is the return value.
            return result

a generator that would be compatible with this would look like this:

def do_smth1():
    1 / 0

def do_smth2():
    print "YAY"

def do_many_things():
    a = yield do_smth1
    b = yield do_smth2
    yield "Done"

>>> consume_exceptions(do_many_things())
YAY

Note that do_many_things() does not call do_smth*, it just yields them, and consume_exceptions calls them on its behalf

User · Answer

No  you cannot do that   That s just the way Python has its syntax   Once you exit a try-block because of an exception  there is no way back in   What about a for-loop though   funcs   do smth1  do smth2  for func in funcs      try          func       except Exception          pass    or you could use  continue    Note however that it is considered a bad practice to have a bare except   You should catch for a specific exception instead   I captured for Exception because that s as good as I can do without knowing what exceptions the methods might throw

User · Answer

I don t think you want to do this  The correct way to use a try statement in general is as precisely as possible  I think it would be better to do   try      do smth1   except Stmnh1Exception        handle Stmnh1Exception  try      do smth2   except Stmnh2Exception        handle Stmnh2Exception

User · Answer

special func to avoid try-except repetition   def special func test case dict       final dict          exception dict           def try except avoider test case dict            try              for k v in test case dict items                    final dict k  eval v   If no exception evaluate the function and add it to final dict          except Exception as e              exception dict k  e  extract exception             test case dict pop k              try except avoider test case dict   recursive function to handle remaining functions          finally    cleanup             final dict update exception dict              return final dict  combine exception dict and  final dict      return try except avoider test case dict     Run code   def add a b       return  a b  def sub a b       return  a-b  def mul a b       return  a b   case     AddFunc   add 8 8    SubFunc   sub p 5    MulFunc   mul 9 6    solution   special func case    Output looks like     AddFunc   16   MulFunc   54   SubFunc   NameError  name  p  is not defined      To convert to variables   locals   update solution    Variables would look like   AddFunc   16  MulFunc   54  SubFunc   NameError  name  p  is not defined

User · Answer

You could iterate through your methods     for m in  do smth1  do smth2       try          m       except          pass

User · Answer

You can achieve what you want  but with a different syntax  You can use a  finally  block after the try except  Doing this way  python will execute the block of code regardless the exception was thrown  or not   Like this   try      do smth1   except      pass finally      do smth2     But  if you want to execute do smth2   only if the exception was not thrown  use a  else  block   try      do smth1   except      pass else      do smth2     You can mix them too  in a  try except else finally clause  Have fun

User · Answer

Depending on where and how often you need to do this  you could also write a function that does it for you   def live dangerously fn   args    kw       try          return fn  args    kw      except Exception          pass  live dangerously do smth1  live dangerously do smth2    But as other answers have noted  having a null except is generally a sign something else is wrong with your code

User · Answer

continue  is allowed within an  except  or  finally  only if the try block is in a loop   continue  will cause the next iteration of the loop to start    So you can try put your two or more functions in a list and use loop to call your function   Like this   funcs    f g  for func in funcs      try  func       except  continue   For full information you can go to this link

User · Answer

While the other answers and the accepted one are correct and should be followed in real code  just for completeness and humor  you can try the fuckitpy   https   github com ajalt fuckitpy   module   Your code can be changed to the following    fuckitpy def myfunc        do smth1       do smth2     Then calling myfunc   would call do smth2   even if there is an exception in do smth1     Note  Please do not try it in any real code  it is blasphemy

[python] python catch exception and continue try block

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