Python 3.7.5 and 3.8.0
A decorator causes inspect.getsource() to return clipped output:



from collections import defaultdict
from functools import wraps
import inspect


def foo(*args):
    def decorator(func):
        @wraps(func)
        def wrapper():
            pass
        return wrapper
    return decorator


@foo(dict(), defaultdict(lambda: 1))
def f():
    pass


print(inspect.getsource(f))



Output:

@foo(dict(), defaultdict(lambda: 1))

Expected output:

@foo(dict(), defaultdict(lambda: 1))
def f():
    pass


These changes to the decorator parameters cause the problem to disappear:

- @foo({}, defaultdict(lambda: 1))
- @foo(dict(), defaultdict(list))