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Setting dtypes and saving memory

A colleague of yours is exploring a list of occupations and how they relate to salary. She has given you a list of these occupations, list_of_occupations, and has a few simple questions such as "How many different titles are there?" and "Which position is the most common?".

This exercise is part of the course

Working with Categorical Data in Python

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Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Create a Series, default dtype
series1 = ____.____(____)
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