From a61cb0b00aac2bea3568d024bee8ddc6f36c9766 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bertrand=20N=C3=A9ron?= <bneron@pasteur.fr>
Date: Sun, 20 Jul 2014 03:18:08 +0200
Subject: [PATCH] add alt solution for exercise on kmer
add solution using a defaultdict
---
source/Collection_Data_Types.rst | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/source/Collection_Data_Types.rst b/source/Collection_Data_Types.rst
index 40de3b7..f21d84c 100644
--- a/source/Collection_Data_Types.rst
+++ b/source/Collection_Data_Types.rst
@@ -275,6 +275,16 @@ solution ::
for kmer, occurence in kmers.items():
print kmer, " = ", occurence
+we can use also a defaultdict: ::
+
+ import collections
+
+ s = s.replace('\n', '')
+ kmers = collection.defaultdict(int)
+ for i in range(len(s) - 3):
+ kmer = s[i:i+3]
+ kmers[kmer] += 1
+
solution bonus ::
list_of_kmers = kmers.items()
--
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