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General Tech QA/Testing 2 years ago
Posted on 16 Aug 2022, this text provides information on QA/Testing related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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I've got a Python program where two variables are set to the value 'public'. In a conditional expression I have the comparison var1 is var2 which fails, but if I change it to var1 == var2 it returns True.
'public'
var1 is var2
var1 == var2
True
Now if I open my Python interpreter and do the same "is" comparison, it succeeds.
>>> s1 = 'public' >>> s2 = 'public' >>> s2 is s1 True
What am I missing here?
is is identity testing, == is equality testing. what happens in your code would be emulated in the interpreter like this:
is
==
>>> a = 'pub' >>> b = ''.join(['p', 'u', 'b']) >>> a == b True >>> a is b False
so, no wonder they're not the same, right?
In other words: is is the id(a) == id(b)
id(a) == id(b)
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