Variable handling functions#
This set of functions find variables of a specific type in a dataframe, or check that a list of variables is of a specified data type.
The find functions take a dataframe as an argument and returns a list with the names
of the variables of the desired type.
The check functions check that the list of variables are all of the desired data type.
The retain functions select the variables in a list if they fulfill a condition.
These functions are used under-the-hood by all Feature-engine transformers to select the variables that they will modify.