Pandas for Everyone: Python Data Analysis, First Edition

I. Lists

Lists are a fundamental data structure in Python. They are used to store heterogeneous data, and are created with a pair of square brackets, [].

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my_list = ['a', 1, True, 3.14]

We can subset the list using square brackets and provide the index of the item we want.

# get the first item print(my_list[0])

a

We can also pass in a range of values (Appendix L).

# get the first 3 values print(my_list[:3])

['a', 1, True]

We can reassign values when we subset values from the list.

# reassign the first value my_list[0] = 'zzzzz' print(my_list)

['zzzzz', 1, True, 3.14]

Lists are objects in Python (Appendix S), so they will have methods that they can perform. For example, we can append values to the list.

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