gokart.build hides Exceptions occured in run()

[Hi-king]

import gokart
class A(gokart.TaskOnKart):
    def run(self):
        raise Exception()
        self.dump("done")
gokart.build(A())

FileNotFoundError: [Errno 2] No such file or directory: './resources/main/A_c72fa9f02fa5c6f019adbf9fe425c9eb.pkl'

---------------------------------------------------------------------------
FileNotFoundError                         Traceback (most recent call last)
<ipython-input-34-6bff8168acc9> in <module>()
      5         raise Exception()
      6         self.dump("done")
----> 7 gokart.build(A())

~/.pyenv/versions/anaconda3-5.3.1/lib/python3.7/site-packages/gokart/build.py in build(task, verbose, return_value, reset_register)
     49     with HideLogger(verbose):
     50         luigi.build([task], local_scheduler=True)
---> 51     return _get_output(task) if return_value else None

~/.pyenv/versions/anaconda3-5.3.1/lib/python3.7/site-packages/gokart/build.py in _get_output(task)
     31     if type(output) == list:
     32         return [x.load() for x in output]
---> 33     return output.load()
     34 
     35 

~/.pyenv/versions/anaconda3-5.3.1/lib/python3.7/site-packages/gokart/target.py in load(self)
     26 
     27     def load(self) -> Any:
---> 28         return self.wrap_with_lock(self._load)()
     29 
     30     def dump(self, obj, lock_at_dump: bool = True) -> None:

~/.pyenv/versions/anaconda3-5.3.1/lib/python3.7/site-packages/gokart/target.py in _load(self)
     93 
     94     def _load(self) -> Any:
---> 95         with self._target.open('r') as f:
     96             return self._processor.load(f)
     97 

~/.pyenv/versions/anaconda3-5.3.1/lib/python3.7/site-packages/luigi/local_target.py in open(self, mode)
    163 
    164         elif rwmode == 'r':
--> 165             fileobj = FileWrapper(io.BufferedReader(io.FileIO(self.path, mode)))
    166             return self.format.pipe_reader(fileobj)
    167 

FileNotFoundError: [Errno 2] No such file or directory: './resources/__main__/A_c72fa9f02fa5c6f019adbf9fe425c9eb.pkl'

[vaaaaanquish]

Everytime I'm debugging it as follows.

gokart.build(A(), verbose=True)

I've always wanted a better way.

[Hi-king]

Thx.
I think it can be better to output task logs when final output will not be found :)

[TaylerUva]

My work arround which prints the raised exception

import gokart
class A(gokart.TaskOnKart):
    def on_failure(self, exception):
        import traceback
        traceback.print_exc()
        return super().on_failure(exception)
        
    def run(self):
        raise Exception()
        self.dump("done")
gokart.build(A())

[vaaaaanquish]

It's similar: #224

I think It is best if luigi returns stacktrace. ( spotify/luigi#3095 )
If not it would be good to implement TaylerUva's method in gokart

[Hi-king]

#237 lessened the pain. For now, gokart.build(Task(), log_level=logging.ERROR) let me know Exceptions() in run() :)

class Task(gokart.TaskOnKart):
    def run(self):
        raise Exception()

gokart.build(Task(), log_level=logging.ERROR)

Thx all!