https://codegolf.stackexchange.com/a/253302

253302.py

from pycallgraph2 import PyCallGraph
from pycallgraph2 import Config
from pycallgraph2 import GlobbingFilter
from pycallgraph2.output import GraphvizOutput

f=lambda p,r,c=0:(q:=[c:=b+c*r for b in p])!=c==0and-~f(q[:-1],r)
x = ([1, -12, 60, -160, 240, -192, 64, 0], 2)

config = Config()
config.trace_filter = GlobbingFilter(exclude=[
    'pycallgraph2.*'
])

with PyCallGraph(output=GraphvizOutput(), config=config):
    f(*x)

Output: