Fix name clash btw. input() and input

Update to Python3 changed the raw_input() function to the input()
function, which clashed with the variable `input` used in this code.

That caused odd behavior.

bin/assembly/phyluce_assembly_explode_get_fastas_file

@@ -46,7 +46,10 @@ def get_args():
         help="""Split file by taxon and not by locus""",
     )
     parser.add_argument(
-        "--split-char", type=str, default="_", help="""The character to split on"""
+        "--split-char",
+        type=str,
+        default="_",
+        help="""The character to split on""",
     )
     return parser.parse_args()
 
@@ -66,13 +69,13 @@ def main():
         os.makedirs(args.output)
     print("Reading fasta...")
     if not args.by_taxon:
-        with open(args.input, "rU") as input:
-            for seq in SeqIO.parse(input, "fasta"):
+        with open(args.input, "rU") as input_file:
+            for seq in SeqIO.parse(input_file, "fasta"):
                 uce = seq.id.split(args.split_char)[0]
                 seqdict[uce].append(seq)
     elif args.by_taxon:
-        with open(args.input, "rU") as input:
-            for seq in SeqIO.parse(input, "fasta"):
+        with open(args.input, "rU") as input_file:
+            for seq in SeqIO.parse(input_file, "fasta"):
                 taxon = "-".join(seq.id.split(args.split_char)[1:])
                 seqdict[taxon].append(seq)
     print("Writing fasta...")