calcgc.py

+#!/usr/bin/env python
+import sys
+
+def calc_gc_perc(seq):
+    atc,gcc = 0, 0
+    for c in seq.upper():
+        if c in ('A', 'T'):
+            atc += 1
+        elif c in ('C', 'G'):
+            gcc += 1
+    return gcc * 100 / (gcc + atc)
+
+inpseq = sys.argv[1]
+print "the sequence is 'CAGG', and has a GC% of {:.2f}".format( calc_gc_perc(inpseq) )
+ 

comblist.py

+#!/usr/bin/env python
+
+i = 0
+for i in range(100):
+    print "({0},{1})".format(i,i)
+