How do I undo True = False in python interactive mode?

This video explains
How do I undo True = False in python interactive mode?

--

Become part of the top 3% of the developers by applying to Toptal
https://topt.al/25cXVn

--

Music by Eric Matyas
https://www.soundimage.org
Track title: Puzzle Meditation

--

Chapters
00:00 Question
00:41 Accepted answer (Score 137)
00:56 Answer 2 (Score 47)
01:34 Answer 3 (Score 37)
01:47 Answer 4 (Score 17)
02:12 Thank you

--

Full question
https://stackoverflow.com/questions/3056...

Question links:
[here]: https://stackoverflow.com/questions/1276...

Accepted answer links:
[del]: https://docs.python.org/2/reference/simp...

--

Content licensed under CC BY-SA
https://meta.stackexchange.com/help/lice...

--

Tags
#python #boolean #python2.x

#avk47

ACCEPTED ANSWER

Score 137

You can simply del your custom name to set it back to the default:

>>> True = False
>>> True
False
>>> del True
>>> True
True
>>>

ANSWER 2

Score 47

This works:

>>> True = False
>>> True
False
>>> True = not False
>>> True
True

but fails if False has been fiddled with as well. Therefore this is better:

>>> True = not None

as None cannot be reassigned.

These also evaluate to True regardless of whether True has been reassigned to False, 5, 'foo', None, etc:

>>> True = True == True   # fails if True = float('nan')
>>> True = True is True
>>> True = not True or not not True
>>> True = not not True if True else not True
>>> True = not 0

ANSWER 3

Score 17

For completeness: Kevin mentions that you could also fetch the real True from __builtins__:

>>> True = False
>>> True
False
>>> True = __builtins__.True
>>> True
True

But that True can also be overriden:

>>> __builtins__.True = False
>>> __builtins__.True
False

So better to go with one of the other options.

ANSWER 4

Score 11

Just do this:

True = bool(1)

Or, because booleans are essentially integers:

True = 1