collection of compile-time Python AST analyzers

 Collection of compile-time analyzers of Python Abstract Syntax Trees
 that can be used as building blocks to write static analyzers or
 compilers:
  * Ancestors: map a node to the list of its enclosing nodes
  * DefUseChains: map a node to the list of definition points in that
    node
  * UseDefChains: map a node to its list of potential definitions
 .
 This package contains the Python 3 version of the library.