[New-bugs-announce] [issue38854] Decorator breaks inspect.getsource

[Guido Imperiale]

New submission from Guido Imperiale <crusaderky at gmail.com>:

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))

----------
messages: 356993
nosy: crusaderky
priority: normal
severity: normal
status: open
title: Decorator breaks inspect.getsource
versions: Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38854>
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