
Reuven M. Lerner
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BW #13: Python developers (solution)
Get better at: CSV files, filtering, memory optimization, speed optimization, dummy values, comprehensions
BW #13: Python developers
Get better at: CSV files, filtering, memory optimization, speed optimization, dummy values, comprehensions
BW #12: Tourism (solution)
Get better at: Excel files, cleaning data, dates and times, string operations, sorting, grouping, window functions
BW #12: Tourism
Get better at: Excel files, cleaning data, dates and times, string operations, sorting, grouping, window functions

BW #11: Software jobs (solution)
Get better at: Date and time data, CSV, plotting, pivot tables, joins, and correlations
BW #11: Software jobs
Get better at: Date and time data, CSV, plotting, pivot tables, joins, and correlations
BW #10: Oil prices (solution)
Get better at: CSV, timing operations, string manipulation, grouping, and PyArrow
BW #10: Oil prices
Get better at: CSV, timing operations, string manipulation, grouping, and PyArrow
BW #9: US house prices (solution)
Get better at: multiple files, multi-indexes, and grouping
BW #9: US house prices
Get better at: multiple files, multi-indexes, and grouping
BW #8: Happiness (solution)
Get better at: Excel, sorting, grouping, joins, and index operations.