Pentax KP has a Pentax KAF2 lens mount and currently there are 161 native lenses available for this mount.
KP also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on KP.
Since Pentax KP has a APS-C sensor, it has a focal length multiplier of 1.5× so you have to multiply lenses original focal length with this multiplier to find the Full Frame equivalent focal length of the lens when mounted on KP.
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Pentax KP Lenses with Image Stabilization
Pentax KP Lenses with Weather Sealings