Some surprising comparison behaviors in Python 2

python2-wyd

Some surprising comparison behaviors in Python 2.

You can confirm these behaviors via doctest:

    python2 -m doctest python2-wyd

Careful, though: some of the results change if the filename is more than
13 characters long.


>>> a, b, c = str(), tuple(), unicode()
>>> a < b
True
>>> b < c
True
>>> a < b < c
True
>>> a < b and b < c
True
>>> a < c
False


>>> int() == long() == float() == complex()
True

>>> complex() < None
False

>>> complex() < True
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: no ordering relation is defined for complex numbers


>>> (
...     None
...     < int()
...     < NotImplemented
...     < type('ayy', (), {})()
...     < iter
...     < bytearray()
...     < dict()
...     < iter({})
...     < Ellipsis
...     < ArithmeticError()
...     < BaseException()
...     < Exception()
...     < ZeroDivisionError()
...     < frozenset()
...     < (lambda: None)
...     < iter('')
...     < list()
...     < iter([])
...     < type('lmao', (), {})()
...     < object()
...     < property()
...     < set()
...     < iter(set())
...     < slice(None)
...     < str()
...     < tuple()
...     < iter(())
...     < bool
...     < property
...     < BaseException
...     < Exception
...     < ArithmeticError
...     < ZeroDivisionError
...     < float
...     < int
...     < list
...     < long
...     < dict
...     < set
...     < slice
...     < str
...     < tuple
...     < object
...     < type
...     < unicode
...     < unicode()
...     == str()  # ಠ_ಠ
... )
True


>>> iter('') < iter('')
True
>>> iter('') < iter('')
False
>>> iter('') < iter('')
True
>>> iter('') < iter('')
False
>>> iter('') < iter('')
False
>>> iter('') < iter('')
False
>>> iter('') < iter('')
False
>>> iter('') < iter('')
False
>>> iter('') < iter('')
True
>>> iter('') < iter('')
False
>>> iter('') < iter('')
True
>>> iter('') < iter('')
False
>>> iter('') < iter('')
False
>>> iter('') < iter('')
False
>>> iter('') < iter('')
False
>>> iter('') < iter('')
False
>>> iter('') < iter('')
True
>>> iter('') < iter('')
False
>>> iter('') < iter('')
True
>>> iter('') < iter('')
False
>>> iter('') < iter('')
False
>>> iter('') < iter('')
False
>>> iter('') < iter('')
False
>>> iter('') < iter('')
False

(Repeat as desired.)