Pretty print by default in Python REPL

Question

How can i enable pretty print on the REPL by default?

Currently I do it by using pprint.pprint() function.

>>> pprint.pprint(data)
{'SHIP_CATEGORY': '',
 'SHIP_QUANTITY': 1,
 'SHIP_SEPARATELY': 0,
 'SHIP_SUPPLEMENT': 0,
 'SHIP_SUPPLEMENT_ONCE': 0,
 'THUMBNAIL': ''}

But I want pretty print by default

>>> data
{'SHIP_CATEGORY': '',
 'SHIP_QUANTITY': 1,
 'SHIP_SEPARATELY': 0,
 'SHIP_SUPPLEMENT': 0,
 'SHIP_SUPPLEMENT_ONCE': 0,
 'THUMBNAIL': ''}

What have I tried?
I searched on google. Didn't found anything most result points to pprint module

Answer 1

Use sys.displayhook

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)

Put Above code to PYTHONSTARTUP if you don't want type it every time you run interactive shell.

Usage:

>>> data = dict.fromkeys(range(10))
>>> data
{0: None, 1: None, 2: None, 3: None, 4: None, 5: None, 6: None, 7: None, 8: None, 9: None}
>>> pprint_on()
>>> data
{0: None,
 1: None,
 2: None,
 3: None,
 4: None,
 5: None,
 6: None,
 7: None,
 8: None,
 9: None}
>>> pprint_off()
>>> data
{0: None, 1: None, 2: None, 3: None, 4: None, 5: None, 6: None, 7: None, 8: None, 9: None}

Answer 2

Use IPython shell:

In [10]: data = {'SHIP_CATEGORY': '',  'SHIP_QUANTITY': 1, 'SHIP_SEPARATELY': 0, 'SHIP_SUPPLEMENT': 0, 'SHIP_SUPPLEMENT_ONCE': 0,}

In [11]: data
Out[11]: 
{'SHIP_CATEGORY': '',
 'SHIP_QUANTITY': 1,
 'SHIP_SEPARATELY': 0,
 'SHIP_SUPPLEMENT': 0,
 'SHIP_SUPPLEMENT_ONCE': 0}

It also has an option --no-pprint in case you want to disable this pretty printing.

IPython shell also has features like tab-completion, multi-line paste, run shell commands etc. So, it is quite better than the normal python shell.

Answer 3

Based on falsetru's accepted answer, but in the form of a one-liner:

from pprint import pprint
import sys

sys.displayhook = lambda x: exec(['_=x; pprint(x)','pass'][x is None])

and to switch back (based on kyrill's comment):

sys.displayhook = sys.__displayhook__