I wouldn't call it tricky, it's actually quite straightforward:
import inspect
def extract_default(function, parameter):
sig = inspect.signature(function)
param = sig.parameters[parameter]
return param.default
def do_something(count=5):
print(count)
def do_something_twice(count=None):
if count is None:
count = extract_default(do_something, "count")
do_something(count)
do_something(count)
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