Raised Exceptions are too generic, could we have a more specific one?

[stabacco]

There are a few places (example) where simple Exception s are being raised.
Would it be possible to change those for some more specialized exceptions? Otherwise they are a bit difficult to catch and they could end up masking other errors.

Thanks.

[leszekhanusz]

In fact this specific check and exception could be removed and replaced by an annotation.

If the check is removed, then an exception of type TypeError should be generated from
graphql/language/source.py#L29 (not tested)

I'll make a PR later.

[leszekhanusz]

I checked where are the other generic exception raised.

client.py#L75 Could be replaced by an assertion
dsl.py#L127 Could be replaced by a TypeError
scripts/gql-cli#L30 Could be replaced by a ValueError

[leszekhanusz]

Now Implemented in PR #95

[KingDarBoja]

Closing as resolved by #95.