  We present PERISTOLE to study the various time delays associated with the
pulsar rotation and other general relativistic aspects of binary pulsars. It is
made available as an open-source python package which takes some parameters of
the double pulsar system as input and outputs the rotational and latitudinal
lensing delays along with the geometric and Shapiro delays that arise due to
gravitational lensing. This package was intended to provide a way to quickly
analyse, evaluate and study the differences between variations of the same
systems and also to quantify the consequences that different parameters have
over the system. Through this research note, we briefly describe the motivation
behind PERISTOLE and showcase its capabilities using the only double pulsar
system ever found, J0737-3039.
