python displayhook for pprint by default

sys_displayhook

#lifted from http://stackoverflow.com/questions/17248383/pretty-print-by-default-in-python-repl

import pprint
import sys

orig_displayhook = sys.displayhook

def myhook(value):
    if value != None:
        __builtins__._ = value
        pprint.pprint(value)

__builtins__.pprint_on = lambda: setattr(sys, 'displayhook', myhook)
__builtins__.pprint_off = lambda: setattr(sys, 'displayhook', orig_displayhook)