Filtering Rows and Selecting Columns (The Right Way)

You know df["column"] selects a column. You know df.head() shows the top rows. But in real analysis, you need surgical precision. Give me rows 50 through 200 where salary is above the median and department is not Sales, and only show me the name, age, and salary columns. That sentence is one Pandas expression when you know what you are doing. Three nested loops when you do not. This post is about knowing what you are doing. Two Ways to Select: loc and iloc These are the two main selectors. They