Python · Iterators, modules and the standard library

itertools.groupby()

Groups consecutive items with the same key. Sort by the key first.

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Syntax

itertools.groupby(iterable, key)

Example

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import itertools
items = sorted(["css", "csharp", "html"], key=lambda s: s[0])
for key, group in itertools.groupby(items, key=lambda s: s[0]):
    print(key, list(group))

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itertools.groupby()

Example

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