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Big data & Spark

PySpark jobs, partitioning, batch processing, and large-dataset transform patterns.

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Big data & Spark easy

How to Shuffle Items by Group in Python

Randomly shuffle items within each group while keeping groups contiguous, using a seed for reproducible results.

random shuffle grouping
Python 
import random

def shuffle_sort_groups(items, group_key, seed=None):
    """Randomize order within groups, keeping groups contiguous."""
    rng = random.Random(seed)
    
    groups = {}
    for item in items:
        key = group_key(item)
        groups.setdefault(key, []).append(item)
    
    result = []
    for k…
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