Structured Data: polymerizing combined and remodeling "Data analysis using pandas -e2"
Data may be spread across many files or databases, the storage form is not conducive to analysis.
This section concerns the polymerization can be combined, a method of remodeling data.
- First, I will introduce a hierarchical index pandas, which are widely used in the above operations.
- I then insight into some special data manipulation.
- Finally, practical applications: In Chapter 14, you can see a variety of applications for these tools.
8.1 Hierarchical Index
Hierarchically ordered rearrangement
Depending on the level summary statistics
Use DataFrame column index
8.2 merge data sets
DataFrame consolidated database style
Merge on the index
Axial connection: connection (concatenation), binding (Binding) or stacked (stacking).
Merging overlapping data
8.3 remodeling and axial rotation
Remodeling index hierarchy
The "long form" rotate "wide format"