flink-ml-python/pyflink/ml/lib/feature/tests/__init__.py

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import os
import sys
from pathlib import Path

# Because the project and the dependent `pyflink` project have the same directory structure,
# we need to manually add `flink-ml-python` path to `sys.path` in the test of this project to change
# the order of package search.
flink_ml_python_dir = Path(__file__).parents[5]
sys.path.append(str(flink_ml_python_dir))

import pyflink

pyflink.__path__.insert(0, os.path.join(flink_ml_python_dir, 'pyflink'))