Implement helper class for generating random values

tv_rand.py

@@ -0,0 +1,28 @@
+import os
+import struct
+
+
+class Rand(object):
+    def __init__(self, random=os.urandom):
+        self._random = random
+
+    def b(self, l):
+        return self._random(l)
+
+    def v(self, l, f):
+        return struct.unpack(f, self.b(l))[0]
+
+    def u8(self):
+        return self.v(1, 'b')
+
+    def u32(self):
+        return self.v(4, '<I')
+
+    def u64(self):
+        return self.v(8, '<Q')
+
+    def bool(self):
+        return self.u8() % 2 > 0
+
+    def a(self, vals):
+        return vals[self.u8() % len(vals)]