rewrite dict as literal, use list comprehension

Author: MarcoGorelli

pymc3/memoize.py

@@ -96,7 +96,7 @@ def hashable(a) -> int:
     if isinstance(a, (tuple, list)):
         # lists are mutable and not hashable by default
         # for memoization, we need the hash to depend on the items
-        return hash(tuple(map(hashable, a)))
+        return hash(tuple(hashable(i) for i in a))
     try:
         return hash(a)
     except TypeError:

pymc3/tests/test_memo.py

@@ -57,13 +57,11 @@ def test_hashing_of_rv_tuples():
             random=pm.Normal.dist(mu, sd).random,
             observed=obs,
         )
-        print()
         for freerv in [mu, sd, dd] + pmodel.free_RVs:
             for structure in [
                 freerv,
-                dict(alpha=freerv, omega=None),
+                {"alpha": freerv, "omega": None},
                 [freerv, []],
                 (freerv, []),
             ]:
-                print(f"testing hashing of: {structure}")
                 assert isinstance(memoize.hashable(structure), int)