code.py 文件源码

def recursionindex(self):
        """ return the index of the frame/TracebackEntry where recursion
            originates if appropriate, None if no recursion occurred
        """
        cache = {}
        for i, entry in enumerate(self):
            # id for the code.raw is needed to work around
            # the strange metaprogramming in the decorator lib from pypi
            # which generates code objects that have hash/value equality
            #XXX needs a test
            key = entry.frame.code.path, id(entry.frame.code.raw), entry.lineno
            #print "checking for recursion at", key
            l = cache.setdefault(key, [])
            if l:
                f = entry.frame
                loc = f.f_locals
                for otherloc in l:
                    if f.is_true(f.eval(co_equal,
                        __recursioncache_locals_1=loc,
                        __recursioncache_locals_2=otherloc)):
                        return i
            l.append(entry.frame.f_locals)
        return None