Python Data Analysis - Second Edition

Data aggregation with Pandas DataFrames

Data aggregation is a term used in the field of relational databases. In a database query, we can group data by the value in a column or columns. We can then perform various operations on each of these groups. The Pandas DataFrame has similar capabilities. We will generate data held in a Python dict and then use this data to create a Pandas DataFrame. We will then practice the Pandas aggregation features:

1. Seed the NumPy random generator to make sure that the generated data will not differ between repeated program runs. The data will have four columns:
   • Weather (a string)
   • Food (also a string)
   • Price (a random float)
   • Number (a random integer between one and nine)

   The use case is that we have the results of some sort ...