Loading data into NumPy arrays

- [Instructor] After the nested for loops…on line 22 through 27 finish building up…my barometric pressure and date-time list,…the next two lines in my program, 29 and 30,…convert those lists into NumPy arrays,…because I need them formatted…as arrays to use with matplotlib.…At first glance, this might seem like…an inefficient way to do things.…Instead of creating two empty lists on line 20,…I could just as easily have written the program…to create two empty arrays and then simply appended…the data values directly to those arrays.…

That would save me from having to do the final step…of converting from lists to arrays.…However, there is a reason that I chose…to assemble my data structure as a list,…and it has to do with how lists…and arrays are implemented in Python.…Looking at the webpage of frequently asked questions…about the design and history of Python,…there's a question that simply asks,…how are lists implemented?…Although the answer they gave here is a bit hand-wavy,…it's good enough to explain why I used lists in my solution.…