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Python FTW: Under the Hood

Mutating the Immutable!

Explore how Python handles immutable sequences and understand the impact of in-place mutations using operators like +=. Learn to recognize common behaviors and exceptions when working with immutable data types to improve your Python programming skills.

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This might seem trivial if you know how references work in Python.

Python 3.5
>>> some_tuple = ("A", "tuple", "with", "values")
>>> another_tuple = ([1, 2], [3, 4], [5, 6])
>>> some_tuple[2] = "change this"
TypeError: 'tuple' object does not support item assignment
>>> another_tuple[2].append(1000) #This throws no error
>>> another_tuple
([1, 2], [3, 4], [5, 6, 1000])
>>> another_tuple[2] += [99, 999]
TypeError: 'tuple' object does not support item assignment
>>> another_tuple
([1, 2], [3, 4], [5, 6, 1000, 99, 999])

Let’s try these in the terminal below.

Terminal 1
Terminal
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