Improve support for functions #1

smnp/environment/function/rand.py

@@ -0,0 +1,17 @@
+import random as r
+
+
+def random(args, env):
+    if not all(isinstance(x, list) and len(x) == 2 and isinstance(x[0], float) for x in args):
+        return # not valid signature
+    if sum([x[0] for x in args]) != 1.0:
+        return # not sums to 100%
+    choice = r.random()
+    acc = 0
+    for e in args:
+        acc += e[0]
+        if choice <= acc:
+            return e[1]
+
+
+#TODO: sample