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fix SyntaxError on !(command)...
fix SyntaxError on !(command) prefilter_line expects that trailing newlines will be trimmed, but run_cell passed it lines with a trailing \n. Single-line run_cell now uses prefilter_lines again, and appends newline explicitly. Formerly failing test included.

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multiengine2.py
28 lines | 753 B | text/x-python | PythonLexer
#-------------------------------------------------------------------------------
# Imports
#-------------------------------------------------------------------------------
import time
from IPython.parallel import Client
#-------------------------------------------------------------------------------
# Setup
#-------------------------------------------------------------------------------
mux = Client()[:]
mux.clear()
mux.block=False
ar1 = mux.apply(time.sleep, 5)
ar2 = mux.push(dict(a=10,b=30,c=range(20000),d='The dog went swimming.'))
ar3 = mux.pull(('a','b','d'), block=False)
print "Try a non-blocking get_result"
ar4 = mux.get_result()
print "Now wait for all the results"
mux.wait([ar1,ar2,ar3,ar4])
print "The last pull got:", ar4.r