# HG changeset patch
# User Damien Correia
# Date 1530628613 -7200
# Node ID 59452a6f51a894af411dbddaab74503689960f59
# Parent  f139914e2eeec1453ce20d27c17e26a6fcfbd61e# Parent  7d552669f29f30251b3fab0ec95099167dc96dc5
merge default

diff -r f139914e2eee -r 59452a6f51a8 src/pyams_utils/list.py
--- a/src/pyams_utils/list.py	Mon Jul 02 17:41:09 2018 +0200
+++ b/src/pyams_utils/list.py	Tue Jul 03 16:36:53 2018 +0200
@@ -15,6 +15,7 @@
 
 # import standard library
 from itertools import filterfalse
+from random import random, shuffle
 
 # import interfaces
 
@@ -102,3 +103,23 @@
             if k not in seen:
                 seen_add(k)
                 yield element
+
+
+def random_iter(iterable, limit=1):
+    """Get items randomly from an iterator
+
+    >>> from pyams_utils.list import random_iter
+    >>> mylist = [1, 2, 3, 2, 1]
+    >>> list(random_iter(mylist, 2))
+    [..., ...]
+    """
+    selected = [None] * limit
+    for index, item in enumerate(iterable):
+        if index < limit:
+            selected[index] = item
+        else:
+            selected_index = int(random() * (index+1))
+            if selected_index < limit:
+                selected[selected_index] = item
+    shuffle(selected)
+    return iter(selected)