Web Reference: Jul 12, 2025 · The itertools.groupby () function in Python is part of the itertools module and is used for grouping consecutive elements of an iterable that have the same value. The groupby() function takes two arguments: (1) the data to group and (2) the function to group it with. Here, lambda x: x[0] tells groupby() to use the first item in each tuple as the grouping key. 1 day ago · Loops over the input iterable and accumulates data into tuples up to size n. The input is consumed lazily, just enough to fill a batch.
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