Intellisense for a module fails in the conditional block when same module used in the if-statement (works for if-not)

From @bgse on July 17, 2017 12:6

Environment data

VS Code version: 1.14.1 (issue also present in 1.13.x) Python Extension version: 0.6.7 Python Version: 2.7.12 OS and version: Ubuntu 16.04

Actual behavior

Intellisense for a specific module (and only this module) fails in the conditional block after the module is used in if-statement, does work for example after module is used in if-not-statement.

Expected behavior

The intellisense for the specific module should not break down depending on how it is used in a conditional statement.

Steps to reproduce:

Try the following example code, see intellisense is broken for the ‘fails’ cases, and is working for the ‘works’ cases.

import os
import sys

if not os.path.isfile('test.txt'):
    works = os.path.isfile('test.txt')
if os.path.isfile('test.txt'):
    fails = os.path.isfile('test.txt')
    works = sys.version_info
    fails = os.path.isfile('test.txt')

if sys.version_info is not None:
    works = sys.version_info

if os.path.isfile('test.txt') is True:
    fails = os.path.isfile('test.txt')

if os.path.isfile('test.txt') is not False:
    fails = os.path.isfile('test.txt')

if os.path.isfile('test.txt') is not True:
    works = os.path.isfile('test.txt')

if os.path.isfile('test.txt') is False:
    works = os.path.isfile('test.txt')

if os.path.isfile('test.txt') is not None:
    works = os.path.isfile('test.txt')

if os.path.isfile('test.txt') is None:
    fails = os.path.isfile('test.txt')

while os.path.isfile('test.txt'):
    works = os.path.isfile('test.txt')

while os.path.isfile('test.txt') is True:
    works = os.path.isfile('test.txt')

while os.path.isfile('test.txt') is not True:
    works = os.path.isfile('test.txt')

Copied from original issue: DonJayamanne/pythonVSCode#1090

[MikhailArkhipov]

This works in VS engine

[brettcannon]

Fixed thanks to the Jedi 0.12.0 upgrade.