Forbid to raise exceptions that are caught in except cases

[sobolevn]

Rule request

Thesis

We need to disallow code like this:

try:
    print(1)
    raise ValueError()
except ValueError:
    print(2)

This is just a goto statement.

Related:

Finding except clauses that raise a different exception class than they catch:

$ astpath "//ExceptHandler[body//Raise/exc//Name and not(contains(body//Raise/exc//Name/@id, type/Name/@id))]" | head -5
./hashlib.py:144        >except ImportError:
./plistlib.py:89        >        except KeyError:
./plistlib.py:103       >        except KeyError:
./nntplib.py:868        >        except ValueError:
./argparse.py:1116      >        except KeyError:

From: https://github.com/hchasestevens/astpath

Reasoning

We do not need a goto in our code.

[sobolevn]

Nope, this is not going to be implemented for two reasons:

1. We still can't catch things like raise IndexError() and except LookupError: in one of the cases
2. Sometimes this goto is useful

Sorry.