Page 172 - Computer Science V2.0 Class 11

Each of the variables lst1 and lst2 refers to the same modified list object.

Fig 7.7: Variables lst1 and lst2 refer to the same list object (object id 1933477279552)
Finally, examine the following:
>>> lst1 = [3, 4, 2, 1]
>>> id(lst1)
2353324714816
>>> id(lst2)
1933477279552
Note that assigning the variable lst1 to a new list object (indeed, it could as well be an object of some other type)
changes its object id. As expected, the assignment of the list object [3, 4, 2, 1] to the variable lst1, did not impact
the variable lst2, which continues to refer to the list [30, 60, 10, 20, 100] (object id 1933477279552).

Fig 7.8: The variables list1 and list2 refer to different objects

Python Datatypes

Immutable Datatypes Mutable Datatypes

Numbers Tuples Lists Sets

Strings Dictionary

Fig 7.9: Mutable and immutable data types in Python

7.3 Visualizing Execution of Python Code

To visualize the execution of Python code, online tool PythonTutor may be used through following link
http://www.pythontutor.com/visualize.html#mode=display

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