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pythondictionarylis

Remove element in list in a dictionary from specific keys

I have a dictionary like below:

my_dict = {'A' : [1, 2, 3, 4, 5], 'B' : [10, 1, 2, 5, 8], 'C': [6, 5, 3, 1]}

I want to remove values less than 3 from "A" and "C" while B remains the same, so the output looks like the below:

my_dict = {'A' : [ 3, 4, 5], 'B' : [10, 1, 2, 5, 8], 'C': [6, 5, 3]}

How to achieve this fast and easy?

Solution

  • I would use a dict/listcomp :

    my_dict = {'A' : [1, 2, 3, 4, 5], 'B' : [10, 1, 2, 5, 8], 'C': [6, 5, 3, 1]}

out = {k: [e for e in v if e >= 3] if k != "B" else v
             for k, v in my_dict.items()}

#1.29 µs ± 12.4 ns per loop (mean ± std. dev. of 7 runs, 1,000,000 loops each)

    Output :

    >>> print(out)

{'A': [3, 4, 5], 'B': [10, 1, 2, 5, 8], 'C': [6, 5, 3]}