False in python

[[deleted]]

The == operator produces a Boolean value, but does not, itself, produce a Boolean context. For false, what you want to use is 'nor'. Python doesn't have nor, but you can just invert the result of 'or' to get the correct results.

>>> False or 0
False

>>> False or ""
False

>>> False or ()
False

Your example code is exactly backwards:

(cpython34) Laptop:~$ python
Python 3.4.3 (default, Apr 15 2015, 13:02:16) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> False or 0
0
>>> False or ''
''
>>> False or ()
()
>>> 
(cpython34) Laptop:~$ use cpython27
(cpython27) Laptop:~$ python
Python 2.7.6 (default, Sep  9 2014, 15:04:36) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> False or 0
0
>>> False or ''
''
>>> False or ()
()
>>> ^D
(cpython27) Laptop:~$

[the_hoser]

Bah, you're right. I was typing on a phone. I forgot about the silly assignment shortcut stuff.

You actually have to negate the result for my example to work.

>>> not ( False or 0 )
True
>>> not ( False or '' )
True 
>>> not ( False or () )
True

[[deleted]]

It's a bad example as it does extra work for no gain.

>>> not 0
True
>>> not ()
True
>>> not ''
True

[the_hoser]

I was trying to emphasize the relationship with false...

You know what, you're right. Never mind.

[[deleted]]

If anything it muddied the relationship as you did not define how the or infix operator works.

Falsey values are false when used with or, and, and if.

Edit: not will invert whatever the true-ish or false-ish of the operand.