Overview and warm-up#
Day 1 connects everyday Python concepts to multidimensional cognitive-neuroscience data.
Today’s notebooks
Today’s questions#
Which Python interpreter is actually running my code?
Where should a script look for its data?
What is the difference between an object, method, and attribute?
Which dimensions does my array contain?
What exactly disappears when I average over an axis?
Retrieval warm-up#
Exercise 5 (Retrieval warm-up)
Answer before running. Write down both outputs.
values = [1, 2, 3]
alias = values
alias.append(4)
print(values)
participant = {"id": "P01", "scores": [7, 9, 8]}
participant["scores"].append(10)
print(participant["scores"][-1])
We will return to the same mental models throughout the day.
Hint
alias = values assigns another name to the same list. Index -1 selects the final
item of a sequence.
Solution to Exercise 5 (Retrieval warm-up)
The outputs are:
[1, 2, 3, 4]
10
values and alias refer to the same mutable list, so appending through alias is visible through values. The nested score list is also mutable; .append(10) adds an item, and index -1 retrieves the final value.