changed the script to be importable

calcgc.py

@@ -30,6 +30,8 @@ def calc_gc_perc(seq):
     except ZeroDivisionError:
         return 0.0
 
-inpseq = sys.argv[1]
-print "the sequence is 'CAGG', and has a GC% of {:.2f}".format( calc_gc_perc(inpseq) )
+if __name__ == '__main__':
+    inpseq = sys.argv[1]
+    print "The sequence '{}' has %GC of {:.2f}".format(
+              inpseq, calc_gc_perc(inpseq))