Dataframe reindex by column

1. How do I change the index of a column in a data frame?
2. How do I reindex my data frame?
3. How do I restore an index to another column?

How do I change the index of a column in a data frame?

To change the index values we need to use the set_index method which is available in pandas allows specifying the indexes. where, inplace parameter accepts True or False, which specifies that change in index is permanent or temporary. True indicates that change is Permanent.

How do I reindex my data frame?

One can reindex a single row or multiple rows by using reindex() method. Default values in the new index that are not present in the dataframe are assigned NaN.

How do I restore an index to another column?

To reset the index in pandas, you simply need to chain the function . reset_index() with the dataframe object. On applying the . reset_index() function, the index gets shifted to the dataframe as a separate column.