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An exercise to help build the right mental model for Python data. The “Solution” link uses memory_graph to visualize execution and reveals what’s actually happening:
It's always fun to guess whether python will call __add__ or __iadd__.
__add__ is called with + and __iadd__ is called with +=, and there is a difference: https://www.reddit.com/r/PythonLearning/comments/1nw08wu/right_mental_model_for_python_data/
Except if __iadd__ doesn't exist on the type, then __add__ is called. The variable is always reassigned. Quick example:
x = (0, [1, 2])
try:
x[1] += [3] # calls list.__iadd__, then reassigns x[1]
except TypeError as e:
print(e)
x += (4,) # calls tuple.__add__, then reassigns x
print(x)
What is printed?
I so wonder what a will result in.
Yes a you get for free to set the tone, the others are more interesting.