Overview: Quilt: Dictionary-Like

Detail	`Quilt.__contains__(value)`	Inclusion of value in column labels.
Detail	`Quilt.__iter__()`	Iterator of column labels, same as Frame.keys.
Detail	`Quilt.get(key, default)`	Return the value found at the columns key, else the default if the key is not fo…
Detail	`Quilt.items()`	Iterator of pairs of column label and corresponding column Series.
Detail	`Quilt.keys()`	Iterator of column labels.
Detail	`Quilt.values`	A 2D NumPy array of all values in the Quilt. As this is a single array, heteroge…