Detect bare `raise` outside of `except` block

Rule request

Thesis

Report raise statements outside of except block

# bad
def smth():
    raise

# good
def smth():
    try:
        ...
    except:
        raise

Reasoning

It causes runtime error:

>>> smth()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 2, in smth
RuntimeError: No active exception to reraise

It is possible that the function smth is meant to be called only from except block and so it won’t fail but I’d say it is quite obscure and is a bad practice.

[amansr02]

Hi. We are first-time contributors (@bhargavi247) and were wondering if we could take a look at this issue if possible? Do let us know if we can work on it. Thank you!

[sobolevn]

Please, add a new one.