fix kmer_2.py

source/_static/code/kmer_2.py

@@ -12,6 +12,5 @@ def get_kmer_occurences(seq, kmer_len):
     for i in range(stop + 1):
         kmer = seq[i: i + kmer_len]
         kmers[kmer] += 1
-    kmers = kmers.items()
-    kmers.sort(key=itemgetter(1), reverse=True)
+    kmers = sorted(kmers.items(), key=itemgetter(1), reverse=True)
     return kmers