From @ajmichaels on September 19, 2017 8:49

Environment data

VS Code version: 1.6.1
Python Extension version: 0.7.0
Python Version: 3.6.2
OS and version: OSX 10.11.6

Actual behavior

Go to definition doesn't work when a function's default arguments includes one or more numbers with underscores

Expected behavior

A number having underscores should not affect go to definition.

Copied from original issue: DonJayamanne/pythonVSCode#1220