added random(sample, shuffle, randrange) methods in helper_random

src/helper_random.py

@@ -1,9 +1,41 @@
 import os
-
+import random
 from pyelliptic.openssl import OpenSSL
 
 def randomBytes(n):
+	"""Method randomBytes."""
     try:
         return os.urandom(n)
     except NotImplementedError:
         return OpenSSL.rand(n)
+
+def randomshuffle(population):
+    """Method randomShuffle.
+
+    shuffle the sequence x in place.
+    shuffles the elements in list in place,
+    so they are in a random order.
+    """
+    return random.shuffle(population)
+
+
+def randomsample(population, k):
+    """Method randomSample.
+
+    return a k length list of unique elements
+    chosen from the population sequence.
+    Used for random sampling
+    without replacement
+    """
+    return random.sample(population, k)
+
+
+def randomrandrange(x, y):
+    """Method randomRandrange.
+
+    return a randomly selected element from
+    range(start, stop). This is equivalent to
+    choice(range(start, stop)),
+    but doesnt actually build a range object.
+    """
+    return random.randrange(x, y)