def __init__(self, progress_queue, progress_db):
    _ThreadBase.__init__(self)

    self.progress_queue = progress_queue
    self.db = progress_db
    self.entities_transferred = 0
Return string to add the foreign key via ALTER TABLE
dataset/ETHPy150Open GoogleCloudPlatform/python-compat-runtime/appengine-compat/exported_appengine_sdk/google/appengine/tools/bulkloader.py/_ProgressThreadBase.__init__--crossover with--dataset/ETHPy150Open perseas/Pyrseas/pyrseas/dbobject/constraint.py/ForeignKey.add