f
by()
This property is deprecated and will be removed in version 1.2.0. Please use .types instead.
.types
The tuple of each column’s stypes (“storage types”).
Tuple[stype, ...]
The length of the tuple is the same as the number of columns in the frame.
.stype – common stype for all columns
.stype
.ltypes – tuple of columns’ logical types
.ltypes