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Control python imports to reduce size and overhead
import difflib

def foo():
    # uses difflib.SequenceMatcher

def bar():
    # benign function ie
    print "Hello!"
    return True

class foobar:
    def __init__():
        print "New foobar"
    def ret_true():
        return True

import pytools
...
item = pytools.foobar()
vals = pytools.bar()

from pytools import foobar, bar
...
item = foobar()
vals = bar()