lightning/tests/trainer/flags/test_env_vars.py

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import os
from pytorch_lightning import Trainer
def test_passing_env_variables(tmpdir):
"""Testing overwriting trainer arguments """
trainer = Trainer()
assert trainer.logger is not None
assert trainer.max_steps is None
trainer = Trainer(False, max_steps=42)
assert trainer.logger is None
assert trainer.max_steps == 42
os.environ['PL_TRAINER_LOGGER'] = 'False'
os.environ['PL_TRAINER_MAX_STEPS'] = '7'
trainer = Trainer()
assert trainer.logger is None
assert trainer.max_steps == 7
os.environ['PL_TRAINER_LOGGER'] = 'True'
trainer = Trainer(False, max_steps=42)
assert trainer.logger is not None
assert trainer.max_steps == 7
# this has to be cleaned
del os.environ['PL_TRAINER_LOGGER']
del os.environ['PL_TRAINER_MAX_STEPS']