trying to solve cookie3.py from first edition

[LeonardoReyes]

Hello,

I have been trying to pull off exercise 2.1 to create the cookie example without replacement but after failing miserably I checked the GIT repository for ThinkBayes2, and found a code with the solution for the second edition....

To my surprise I saw that I was on the correct track, however when trying to re-write the solution for the first version of ThinkBayes I still could not make it work...

if I use the following to set the hypos

bowl1=dict(vanilla=30,chocolate=10)
bowl2=dict(vanilla=20,chocolate=20)
pmf=Cookie([bowl1, bowl2])

I get:

TypeError: unhashable type: 'dict'

If I use the following (as cookie3.py in ThinkBayes2 )

bowl1=Hist(dict(vanilla=30,chocolate=10))
bowl2=Hist(dict(vanilla=20,chocolate=20)) 

I get :

AttributeError: 'Hist' object has no attribute 'Normalize'

I really want to see the solution to this, any hint or suggestion will be really appreciated!

Many thanks!

Leo