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if I import any python script in the beginning of the code in then I haver next errors:
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
 File "/usr/lib/python2.7/atexit.py", line 24, in _run_exitfuncs
 func(*targs, **kargs)
 File "/usr/lib/python2.7/multiprocessing/util.py", line 295, in _exit_function
 p.join()
 File "/usr/lib/python2.7/multiprocessing/process.py", line 143, in join
 assert self._parent_pid == os.getpid(), 'can only join a child process'
AssertionError: can only join a child process
Error in sys.exitfunc:
Traceback (most recent call last):
 File "/usr/lib/python2.7/atexit.py", line 24, in _run_exitfuncs
 func(*targs, **kargs)
 File "/usr/lib/python2.7/multiprocessing/util.py", line 295, in _exit_function
 p.join()
 File "/usr/lib/python2.7/multiprocessing/process.py", line 143, in join
 assert self._parent_pid == os.getpid(), 'can only join a child process'
AssertionError: can only join a child process

The example you uploaded doesn't call multiprocessing, yet the traceback you show does. Can you provide more details on what you are actually doing? Note that if you are importing a module that does a fork when it is imported, you are doing something wrong.

thanks David,
scripts which I imported were relying on some librarary which I did not understand. I was able to get rid of it and I don't have these errors any more. It was bug in my program. Thank you again.