From bef93fa4924bbc49c390c6ce8e8190d248566b88 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=98=D0=B2=D0=B0=D0=BD=20=D0=94=D0=B7=D1=8E=D0=B1=D0=B5?=
 =?UTF-8?q?=D0=BD=D0=BA=D0=BE?= <id@calculate.ru>
Date: Tue, 14 Sep 2021 09:56:41 +0300
Subject: [PATCH] fixed empty iterator console output error (StopIteration)

---
 pym/calculate/lib/utils/tools.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/pym/calculate/lib/utils/tools.py b/pym/calculate/lib/utils/tools.py
index 6358331..bf38863 100644
--- a/pym/calculate/lib/utils/tools.py
+++ b/pym/calculate/lib/utils/tools.py
@@ -195,7 +195,6 @@ class SingletonParam(type):
             cls.instance[keyarg] = create_obj(*args, **kw)
         return cls.instance[keyarg]
 
-
 def classificate(iterator):
     """
     Классифицировать элементы по признаку (first первый last последний)
@@ -209,8 +208,13 @@ def classificate(iterator):
         def __repr__(self):
             return "Mark(first=%s,last=%s)" % (self.first, self.last)
 
+
     iterator = iter(iterator)
-    obj = next(iterator)
+    try:
+        obj = next(iterator)
+    except StopIteration:
+        #empty iterator
+        return
     try:
         obj_next = next(iterator)
         yield Mark(first=True, last=False), obj