[Solved] Python min value in nested lists [closed]

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Start by preprocessing a_list into something that can quickly access all values associated with an element from b_list.

import collections
a_dict = collections.defaultdict(list)
for k,v in a_list:
    a_dict[k].append(v)

# a_dict = {'1': [2.0, 3.5, 2.5], '2': [.5, .5, 1]}
# If you want to eliminate duplicate values, such as seen
# with the key '2', use a set instead of a list during the aggregation.

Now it’s just a matter of applying min to each appropriate value in a_dict

for b in b_list:
    print(min(a_dict[b]))

solved Python min value in nested lists [closed]