What is difference between 'is' and '==' in python ?

Question

a = [1,2,3]
b = [1,2,3]
print (a is b) # false
print (a == b) # true
I'm puzzled by these outputs.

Answer 1

https://code.sololearn.com/cARyHC62Rq0E/?ref=app

Hopefully this code can help you understand. Variable equality and list equality are a little different in Python. Variables are stored by value and lists are stored by reference. The equality operator (==) compares variables and lists alike by value. Since a and b have the same values, a == b. The is keyword is a little different. It checks if a list is an alias to the same list. The alias variable (in my code it is list c) has the same values as the original list yes (a list) but c was assigned with c or really the reference to the a list making c an alias to a. Basically, c IS another name for a in my code, but b is separate from a even if it has the same values making b IS NOT c.

Answer 2

"==" returns true if 2 quantities are equal in value.
"is" returns true if 2 quantities have the same value, and originate from the same source.
for mutable objects, "==" can return true but "is" may return false.
for immutable objects, both are essentially the same

Answer 3

You will find your answer here
Refer the 6th point:
https://www.sololearn.com/discuss/1187881/?ref=app

Answer 4

but there are many things like this in python so how can I manage to remember all this ?