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3. itertools.groupby(): Group Elements of an Iterable

Sumit Rawal answered on May 13, 2023 Popularity 9/10 Helpfulness 4/10

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  • 3. itertools.groupby(): Group Elements of an Iterable

    1

    The itertools.groupby() function is a convenient way to group adjacent duplicate items of an iterable.

    For instance, we can group a long string as follows:

    from itertools import groupby

    for key, group in groupby('YAaANNGGG'):

    print(key, list(group))

    # Y ['Y']

    # A ['A']

    # a ['a']

    # A ['A']

    # N ['N', 'N']

    # G ['G', 'G', 'G']

    Furthermore, we can harness its second argument to tell the groupby() function how to determine whether two items are the same or not:

    from itertools import groupby

    for key, group in groupby('YAaANNGGG', lambda x: x.upper()):

    print(key, list(group))

    # Y ['Y']

    # A ['A', 'a', 'A']

    # N ['N', 'N']

    # G ['G', 'G', 'G']  

    Popularity 9/10 Helpfulness 4/10 Language typescript
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    Contributed on May 13 2023
    Sumit Rawal
    0 Answers  Avg Quality 2/10


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