KnowCardPython · Decorators
What does @deco written above a function definition actually do to the name?
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A decorator's wrapper is written as def wrapper(*args, **kwargs): and calls fn(*args, **kwargs). Why both the */** in the signature AND in the call?
What does this print?
```python
def with_timing(fn):
def wrapper(*a, **k):
return fn(*a, **k)
return wrapper
@with_timing
def nap():
"""sleep"""
print(nap.__name__)
```
What does functools.wraps do, and where do you put it?
What does this print?
```python
def a(f):
def w(): print("a"); f()
return w
def b(f):
def w(): print("b"); f()
return w
@a
@b
def g(): print("g")
g()
```
@a then @b above a function is equivalent to which single assignment?
Your decorator's wrapper works, but the decorated function's call returns None even though the original returns a value. What's the bug?
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