Reindexing in pandas is a process that makes the data in a
DataFrame match a given set of labels. This is core to the functionality of pandas as it enables label alignment across multiple objects, which may originally have different indexing schemes.
This process of performing a reindex includes the following steps:
NaNmarkers where no data exists for a label.
Here is a simple example of reindexing a
Series. The following
Series has an index with numerical values, and the index is modified to be alphabetic by simply assigning a list of characters to the