added freq02.py line-by-line with translation table

bench.py

@@ -18,6 +18,7 @@ def run1(args, src_name, num_runs):
 runs = [
 	[['java', '-jar', './bin/freq01scala.jar'], 'freq01.scala', 3],
 	[['python', './src/freq01.py'], 'freq01.py', 3],
+	[['python', './src/freq02.py'], 'freq02.py', 3],
 	[['./bin/freq03cpp' + EXE], 'freq03.cpp'],
 	[['./bin/freq02cpp' + EXE], 'freq02.cpp'],
 	[['./bin/freq01cpp' + EXE], 'freq01.cpp'],

src/freq02.py

@@ -0,0 +1,46 @@
+import string
+import sys
+from collections import Counter
+
+from itertools import chain
+
+
+if len(sys.argv) != 3:
+    print('No args')
+    exit(1)
+
+
+def sort_key(x):
+    word, fq = x
+    return -fq, word
+
+
+non_alpha = bytes(ch for ch in range(256) if chr(ch) not in string.ascii_letters)
+
+
+tab = bytes.maketrans(
+    string.ascii_uppercase.encode() + non_alpha,
+    string.ascii_lowercase.encode() + b' ' * len(non_alpha)
+)
+
+
+with open(sys.argv[1], 'rb') as in_file:
+    # Replace any non-alphabetical symbols with spaces and split the string using space separator.
+    translated = chain.from_iterable(
+        line.translate(tab).split(b' ') for line in in_file
+    )
+
+    # Ignore empty strings.
+    words = filter(None, translated)
+
+    counts = sorted(Counter(words).items(), key=sort_key)
+
+    result = b'\r\n'.join(
+        b' '.join(
+            (str(v).encode(), k)
+        )
+        for k, v in counts
+    ) + b'\r\n'
+
+with open(sys.argv[2], 'wb+') as out_file:
+    out_file.write(result)