Python console - different variables appeared to be the same object when code copied to console as block

Hello,

This what I noticed, using Pycharm's Python console

When the code below is copied to console as block, variables 'a' and 'b' are the same objects

>>> a = 1000
b = 1000
print (a is b)
True

>>> id(a)
36079236
>>> id(b)
36079236

But in this case, when entering code line by line, both variables are different objects

>>> a = 1000
>>> b = 1000
>>> print (a is b)
False

Could it be that in the first case PyCharm doing some kind of optimization like

>>> a = b = 1000
>>> print (a is b)
True


Thanks for help