Make your Python interactive shell infinitely more usable

.pythonstartup

# .pythonstartup - executed by python interactive shell

import atexit
import os
import pprint
import readline
import rlcompleter
import sys

try:
    import builtins
except ImportError:
    builtins = __builtins__

try:
    from importlib import reload
except ImportError:
    pass

try:
    import asyncio
    loop = asyncio.get_event_loop_policy().new_event_loop()
    def run(coro):
        return loop.run_until_complete(coro)
except Exception:
    pass


# nicer output
orig_displayhook = sys.displayhook

def pprint_displayhook(value):
    if value is not None:
        builtins._ = value
        pprint.pprint(value)

builtins.pprint_on = lambda: setattr(sys, 'displayhook', pprint_displayhook)
builtins.pprint_off = lambda: setattr(sys, 'displayhook', orig_displayhook)
pprint_on()


# tab completion
if 'libedit' in readline.__doc__:
    readline.parse_and_bind("bind ^I rl_complete")
else:
    readline.parse_and_bind("tab: complete")

readline.set_completer(rlcompleter.Completer(globals()).complete)


# history file
histfile = os.path.join(os.environ['HOME'], '.pythonhistory')
try:
    readline.read_history_file(histfile)
except IOError:
    pass

atexit.register(readline.write_history_file, histfile)
del os, histfile, readline, rlcompleter