From 6faee48f35f74cf2cb0ddaaa40283f23952ff467 Mon Sep 17 00:00:00 2001
From: Alex Odinayev <aodinaev@gmail.com>
Date: Mon, 18 May 2020 10:08:16 -0400
Subject: [PATCH] added freq02.py

---
 src/freq02.py | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 src/freq02.py

diff --git a/src/freq02.py b/src/freq02.py
new file mode 100644
index 0000000..c3c624f
--- /dev/null
+++ b/src/freq02.py
@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+
+import re
+import mmap
+import sys
+from collections import defaultdict
+
+def usage():
+    print(f'{sys.argv[0]} <input> <output>')
+    sys.exit(1)
+
+def main():
+    if len(sys.argv) != 3:
+        usage()
+
+    xpr = re.compile(b'[a-z]+', re.I)
+    with open(sys.argv[1]) as fh:
+        fh.seek(0, 2)
+        fsz = fh.tell()
+        data = mmap.mmap(fh.fileno(), fsz, access=mmap.ACCESS_READ)
+        words = xpr.finditer(data)
+
+        freq = defaultdict(int)
+        for w in words:
+            freq[w[0].lower()] += 1
+
+        with open(sys.argv[2], "w") as out:
+            for k, v in sorted(freq.items(), key=lambda u: (-u[1], u[0])):
+                out.write('%d %s\n' % (v, k.decode(encoding='UTF-8')))
+
+if __name__ == '__main__':
+    main()