Instance variable with same name as class erroneously flagged as unbound

[Godsmith]

Environment data

• Language Server version: 2020.7.3
• OS and version: Windows 10 1909
• Python version (& distribution if applicable, e.g. Anaconda): 3.8

Expected behaviour

When I have a module with the following code:

class bar:
    pass


class Foo:
    def __init__(self, bar_: bar) -> None:
        self.bar = "hello"

no problems shall be listed.

Actual behaviour

A problem appears in the Problems tab, and squiggly lines are shown under the type of the bar_ argument:

"bar" is unbound Pylance (reportUnboundVariable)

Logs

[BG] analyzing: c:\Users\filip\workspace\timereporter\timereporter\datetest.py (5ms)
[FG] parsing: c:\Users\filip\workspace\timereporter\timereporter\datetest.py (0ms)
[FG] binding: c:\Users\filip\workspace\timereporter\timereporter\datetest.py (0ms)
[BG] analyzing: c:\Users\filip\workspace\timereporter\timereporter\datetest.py ...
[BG]   parsing: c:\Users\filip\workspace\timereporter\timereporter\datetest.py (4ms)
[BG]   binding: c:\Users\filip\workspace\timereporter\timereporter\datetest.py (1ms)
[BG]   checking: c:\Users\filip\workspace\timereporter\timereporter\datetest.py (27ms)
[BG] analyzing: c:\Users\filip\workspace\timereporter\timereporter\datetest.py (33ms)
[FG] parsing: c:\Users\filip\workspace\timereporter\timereporter\datetest.py (1ms)
[FG] binding: c:\Users\filip\workspace\timereporter\timereporter\datetest.py (0ms)
[BG] analyzing: c:\Users\filip\workspace\timereporter\timereporter\datetest.py ...
[BG]   parsing: c:\Users\filip\workspace\timereporter\timereporter\datetest.py (1ms)
[BG]   binding: c:\Users\filip\workspace\timereporter\timereporter\datetest.py (0ms)
[BG]   checking: c:\Users\filip\workspace\timereporter\timereporter\datetest.py (8ms)
[BG] analyzing: c:\Users\filip\workspace\timereporter\timereporter\datetest.py (9ms)

Code Snippet / Additional information

One might think it would be rare that you would have a variable with the same name as a class, however, some packages like datetime has lowercase class names. In fact, I found this bug when I tried to name a variable date while I had imported the date class from datetime.

[erictraut]

Thanks for the bug report. I just introduced a fix for this problem. It will be addressed in the next version of Pylance.

[CatNofishing]

Good!

[jakebailey]

This issue has been fixed in version 2020.7.4, which we've just released. You can find the changelog here: https://github.com/microsoft/pylance-release/blob/master/CHANGELOG.md#202074-29-july-2020