private children

run.py

@@ -11,7 +11,7 @@ import subprocess
 
 
 class Server:
-    children = list()
+    _children = list()
 
     host = ('127.0.0.1', 5000)
     sock = socket.socket()
@@ -55,8 +55,8 @@ class Server:
 
     @property
     def children(self):
-        children = self.children
-        self.children = list()
+        children = self._children
+        self._children = list()
         return children