Pylint not catching undefined variable.

[asincero]

Steps to reproduce

Lint the following:

a = 37337
if a == 37337:
    some_value = 'fee'
    print(some_value)
else:
    print(some_value)

Current behavior

pylint doesn't catch that "some_value" is not defined in the "else" block.

Expected behavior

I'm thinking pylint should be able to catch that "some_value" is not defined in the "else" block.

pylint --version output

Using config file /home/tech/.pylintrc
pylint 1.8.2,
astroid 1.6.1
Python 3.6.4 (default, Jan 30 2018, 17:36:50)
[GCC 6.3.0 20170516]

[brycepg]

This really can't happen properly without constructing a control-flow graph of nodes for lookup, which pylint currently doesn't have the ability to do unfortunately. Currently we only do lookups by 'scope' (if statement blocks do not have scope).

Don't expect this to be fixed for a long while yet :(

Closing as duplicate of #85
Also reported as #12, #1376