interrupt and signal handling for Cython -- Python 3 - bare

 Since Cython optimizes for speed, Cython normally does not check
 for interrupts. The cysignals package provides mechanisms to handle
 interrupts (and other signals and errors) in Cython code.
 .
 This package installs the library for Python 3; this very library
 was not built against the PARI/GP library.