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Big data & Spark

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

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Big data & Spark medium

Accumulators Global Counter Mock in Python

Shows an accumulator-style global counter with a mock patch to control its value in tests.

accumulator global state mock
Python 
import unittest
from unittest.mock import patch

# Module-level global counter accumulator
counter = 0

def increment(by=1):
    """Increment the global counter in place (accumulator pattern)."""
    global counter
    counter += by
    return counter

def reset():
    """Reset the counter to zero."""
    global count…
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