'''Traceback (most recent call last):

 "<ipython-input-2-3d5db3454687>", line 1, in <module>
numpy.mean([1,2])NameError: name 'numpy' is not defined
Traceback (most recent call last):

 "C:\Users\YOGESH\Anaconda3\lib\site-packages\spyder\utils\external\lockfile.py", line 189, in lock
kill(int(pid), 0)

 "C:\Users\YOGESH\Anaconda3\lib\site-packages\spyder\utils\external\lockfile.py", line 81, in kill
raise OSError(errno.ESRCH, None)ProcessLookupError: [Errno 3] None