Is there a difference between “==” and “is”?
The operators <, >, ==, >=, <=, and != compare the values of two objects.
equality
Why does comparing strings using either ‘==’ or ‘is’ sometimes produce a different result?
Two string variables are set to the same value. s1 == s2 always returns True, but s1 is s2 sometimes returns False.
Is False == 0 and True == 1 an implementation detail or is it guaranteed by the language?
Is it guaranteed that False == 0 and True == 1, in Python (assuming that they are not reassigned by the user)? For instance, is it in any way guaranteed that the following code will always produce the same results, whatever the version of Python (both existing and, likely, future ones)?
String comparison in Python: is vs. ==
For all built-in Python objects (like
strings, lists, dicts, functions,
etc.), if x is y, then x==y is also
True.
Elegant ways to support equivalence (“equality”) in Python classes
When writing custom classes it is often important to allow equivalence by means of the == and != operators. In Python, this is made possible by implementing the __eq__ and __ne__ special methods, respectively. The easiest way I’ve found to do this is the following method:
Compare object instances for equality by their attributes
I have a class MyClass, which contains two member variables foo and bar:
Why can a Python dict have multiple keys with the same hash?
I am trying to understand the Python hash function under the hood. I created a custom class where all instances return the same hash value.
Why don’t methods have reference equality?
I had a bug where I was relying on methods being equal to each other when using is. It turns out that’s not the case:
double equals vs is in python
I run the following in the Python interpreter: >>> foo = 10 >>> dir(foo) == dir(10) True >>> dir(foo) is dir(10) False >>> Why is this? Answers: Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as … Read more
Determine if 2 lists have the same elements, regardless of order?
Determine if 2 lists have the same elements, regardless of order?