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| -rw-r--r-- | Doc/reference/expressions.rst | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst index 16542cdcec..8036a491c2 100644 --- a/Doc/reference/expressions.rst +++ b/Doc/reference/expressions.rst @@ -1422,8 +1422,9 @@ built-in types. The not-a-number values ``float('NaN')`` and ``decimal.Decimal('NaN')`` are special. Any ordered comparison of a number to a not-a-number value is false. A counter-intuitive implication is that not-a-number values are not equal to - themselves. For example, if ``x = float('NaN')``, ``3 < x``, ``x < 3``, ``x - == x``, ``x != x`` are all false. This behavior is compliant with IEEE 754. + themselves. For example, if ``x = float('NaN')``, ``3 < x``, ``x < 3`` and + ``x == x`` are all false, while ``x != x`` is true. This behavior is + compliant with IEEE 754. * ``None`` and ``NotImplemented`` are singletons. :PEP:`8` advises that comparisons for singletons should always be done with ``is`` or ``is not``, |