[python] Is there a difference between "==" and "is"?

In a nutshell, is checks whether two references point to the same object or not.== checks whether two objects have the same value or not.

a=[1,2,3]
b=a        #a and b point to the same object
c=list(a)  #c points to different object 

if a==b:
    print('#')   #output:#
if a is b:
    print('##')  #output:## 
if a==c:
    print('###') #output:## 
if a is c:
    print('####') #no output as c and a point to different object 

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