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Everything object

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Background Context

Now that we understand that everything is an object and have a little bit of knowledge, let’s pause and look a little bit closer at how Python works with different types of objects.

BTW, have you ever modified a variable without knowing it or wanting to? I mean:

>>> a = 1
>>> b = a
>>> a = 2
>>> b
1
>>>

OK, But what about this?

>>> l = [1, 2, 3]
>>> m = l
>>> l[0] = 'x'
>>> m
['x', 2, 3]
>>>

meme

Resources

  1. Objects and Values
  2. Aliasing
  3. Immutable vs mutable types
  4. Mutation
  5. Cloning lists
  6. Python tuples - Immutable but potentially changing

Learning objectives

By the end of this project, you should be able to explain to anyone the following concepts without the help of Google.

  • What is an object
  • What is the difference between a class and an object or instance
  • What is the difference between immutable object and mutable object
  • What is a reference
  • What is an assignment
  • What is an alias
  • How to know if two variables are identical
  • How to know if two variables are linked to the same object
  • How to display the variable identifier (which is the memory address in the CPython implementation)
  • What is mutable and immutable
  • What are the built-in mutable types
  • What are the built-in immutable types
  • How does Python pass variables to functions