Maybe this will help:
>>> def get(key, default):
... print("entering get")
... print(f"{key=} {default=}")
... print("exiting get")
...
>>> def generate_default():
... print("entering generate_default")
... print("exiting generate_default")
... return 1
...
>>> get("a", generate_default())
entering generate_default
exiting generate_default
entering get
key='a' default=1
exiting get
>>> -- https://mail.python.org/mailman/listinfo/python-list
