Boolean

Expr.all([drop_nulls])	Check if all boolean values in a Boolean column are True.
Expr.any([drop_nulls])	Check if any boolean value in a Boolean column is True.
Expr.is_between(lower_bound, upper_bound[, ...])	Check if this expression is between the given start and end values.
Expr.is_duplicated()	Get mask of duplicated values.
Expr.is_finite()	Returns a boolean Series indicating which values are finite.
Expr.is_first()	Get a mask of the first unique value.
Expr.is_in(other)	Check if elements of this expression are present in the other Series.
Expr.is_infinite()	Returns a boolean Series indicating which values are infinite.
Expr.is_nan()	Returns a boolean Series indicating which values are NaN.
Expr.is_not()	Negate a boolean expression.
Expr.is_not_nan()	Returns a boolean Series indicating which values are not NaN.
Expr.is_not_null()	Returns a boolean Series indicating which values are not null.
Expr.is_null()	Returns a boolean Series indicating which values are null.
Expr.is_unique()	Get mask of unique values.