[issue38146] QVariant NULL returns anomalous values in equality statements

[John Midgett]

New submission from John Midgett <jamidgett at gmail.com>:

Per PEP 8, equality comparisons to None should use the "is" or "is not" keywords. However, if x is a {QVariant}NULL, the equality statement with the "is" keyword returns FALSE whereas the "==" comparison returns TRUE.  

Hence where cond = {QVariant}NULL:

    if cond is None  # Returns False
    if cond == None  # Returns True

This can cause some unexpected code anomalies (as it did for me) when adjusting code for PEP 8 compliance.

----------
components: Interpreter Core
messages: 352227
nosy: John Midgett
priority: normal
severity: normal
status: open
title: QVariant NULL returns anomalous values in equality statements
type: behavior
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38146>
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