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f=lambdalambda p,c:(f:=lambda p,a=0:f(p[1:],c,eval(f'(a{c[p[0]]})'))if p else a)
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replaces the '=' operator with ':=' in order to utilize python 3.8+ walrus expressions
f=lambda p,c,a=0:f(p[1:],c,eval(f'(a{c[p[0]]})'))if p else a
Try it online!
lambda c:(f:=lambda p,a=0:f(p[1:],eval(f'(a{c[p[0]]})'))if p else a)
