Pandas Workout

2 Data frames

Since long before the invention of computers, people have used tables to present data. That’s because tables make it easy to enter, display, understand, and analyze data. Each row in a table represents a single record or data point, and every column describes an attribute associated with each point. For example, consider table 2.1 of country names, sizes (in square kilometers), and populations, with data taken from Wikipedia toward the end of 2022.

Table 2.1 Country data

Country	Area (sq km)	Population
United States	9,833,520	331,893,745
United Kingdom	93,628	67,326,569
Canada	9,984,670	38,654,738
France	248,573	67,897,000
Germany	357,022	84,079,811

If it seems obvious ...