ashb opened a new pull request, #44186:
URL: https://github.com/apache/airflow/pull/44186
Without this change a dag like this:
```
@task()
def hello():
print("hello")
time.sleep(300)
print("goodbye")
```
would not show the output for "hello" until after the sleep!
This is analogouys to setting PYTHONUNBUFFERED environment variable when
running something like `python script.py | cat` etc.
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