Type of a sequence

Raised to indicate ill-formed sequence.

Make sequence from string. Raise Bad if unsuccessful.

Make sequence from buffer. Raise Bad if unsuccessful.

nth t i returns the ith nucleic acid in sequence t. Raise Failure if i is out of range.

Length of sequence.

Return string representation of sequence. Answer can be successfully converted back using of_string.

True if given character represents one of the allowed nucleic acid codes, case-insensitive.

slice first last t returns the sub-sequence, or slice, of t starting from index first to last (inclusive). Raise Failure if indices out of range or if first > last.

see String.fold_left.

String.fold_lefti

Make a sequence from given buffer or string. Every character in input should satisfy is_nucleic_acid, else returned sequence is ill-formed and behavior of operations on it are undefined.