Importing modules or defining functions in regular cells (without the `%%px` magic) are not known in cells where the `%%px` macro is used. The same is true for the other way around. To reproduce this try ```py # Cell 1 import ipyparallel as ipp from mpi4py import MPI # Cell 2 cluster = ipp.Cluster(engines="mpi", n=4) clients = cluster.start_and_connect_sync() # Cell 3 %%px import sys def abc(): print('abc') # Cell 4 import os def cde(): print('cde') # Cell 5: %%px os.getpid() cde() # Cell 6: sys.getsizeof(0.0) abc() ``` Cell 5 and Cell 6 will fail on both statements in each. A global `%autopx` would ensure that everything runs on the engines, which makes development kind of inconvenient (e.g. prints are done on all engines and so on). Defining different views and activating them according to how many engines are needed, e.g. one for development with a single engine, seems overkill. What is the recommended approach to solve the outlined problem?