Iterate over IntelliGenetics records (as SeqRecord objects).

handle - input file alphabet - optional alphabet

The optional free format file header lines (which start with two semi-colons) are ignored.

The free format commentary lines at the start of each record (which start with a semi-colon) are recorded as a single string with embedded new line characters in the SeqRecord’s annotations dictionary under the key ‘comment’.

Example:

 >>> with open("IntelliGenetics/TAT_mase_nuc.txt") as handle:
 ...     for record in IgIterator(handle):
 ...         print("%s length %i" % (record.id, len(record)))
 ...
 A_U455 length 303
 B_HXB2R length 306
 C_UG268A length 267
 D_ELI length 309
 F_BZ163A length 309
 O_ANT70 length 342
 O_MVP5180 length 348
 CPZGAB length 309
 CPZANT length 309
 A_ROD length 390
 B_EHOA length 420
 D_MM251 length 390
 STM_STM length 387
 VER_AGM3 length 354
 GRI_AGM677 length 264
 SAB_SAB1C length 219
 SYK_SYK length 330