Python “is not True” and “is False” is not the same. x is not True
will be true for any value x
that is not the singleton object True
.
is not
is its own comparison operation.
The NOT operator ! negates logical expressions so that TRUE expressions become FALSE and FALSE expressions become TRUE.
Python “is not True” same as “is False”?
Simple example code disassembled bytecode, is not
is its own comparison operation
import dis
print(dis.dis("x is not True"))
print(dis.dis("x is false"))
Output:

Note: IDE: PyCharm 2021.3.3 (Community Edition)
Windows 10
Python 3.10.1
All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.