isnone(x)
Checks if x is None. Handy with filtering functions:
_, data = lsplit_by(isnone, dirty_data) # Skip leading nonesPlays nice with silent, which returns None on fail:
remove(isnone, map(silent(int), strings_with_numbers))Note that it's usually simpler to use keep or compact if you don't need to distinguish between None and other falsy values.
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 valuesinc(x)
Increments its argument by 1.
dec(x)
Decrements its argument by 1.
even(x)
Checks if x is even.
odd(x)
Checks if x is odd.