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Primitives
==========
.. function:: isnone(x)
Checks if ``x`` is ``None``. Handy with filtering functions::
_, data = lsplit_by(isnone, dirty_data) # Skip leading nones
Plays nice with :func:`silent`, which returns ``None`` on fail::
remove(isnone, map(silent(int), strings_with_numbers))
Note that it's usually simpler to use :func:`keep` or :func:`compact` if you don't need to distinguish between ``None`` and other falsy values.
.. function:: notnone(x)
Checks if ``x`` is not ``None``. A shortcut for ``complement(isnone)`` meant to be used when ``bool`` is not specific enough. Compare::
select_values(notnone, data_dict) # removes None values
compact(data_dict) # removes all falsy values
.. function:: inc(x)
Increments its argument by 1.
.. function:: dec(x)
Decrements its argument by 1.
.. function:: even(x)
Checks if ``x`` is even.
.. function:: odd(x)
Checks if ``x`` is odd.
.. raw:: html
:file: descriptions.html
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