Time for action – summarizing data

The data we will summarize will be for a whole business week, running from Monday to Friday. During the period covered by the data, there was one holiday on February 21, President's Day. This happened to be a Monday and the US stock exchanges were closed on this day. As a consequence, there is no entry for this day, in the sample. The first day in the sample is a Friday, which is inconvenient. Use the following instructions to summarize data:

1. To simplify, just have a look at the first three weeks in the sample— later, you can have a go at improving this:

   close = close[:16]
   dates = dates[:16]

   We will be building on the code from the previous Time for action section.

2. Commencing, we will find the first Monday in our sample data. Recall that Mondays have the code 0 in Python. This is what we will put in the condition of the where() function. Then, we will need to extract the first element that has index 0. The result will be a multidimensional array. Flatten this...