From 005c9739bca427e33160a55d59ae22cac5b6bfc8 Mon Sep 17 00:00:00 2001
From: mamushi641 <87245618+mamushi641@users.noreply.github.com>
Date: Sat, 7 Aug 2021 15:45:39 +0800
Subject: [PATCH 1/2] Update config.py

---
 config.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/config.py b/config.py
index 1dada77..9182a53 100644
--- a/config.py
+++ b/config.py
@@ -9,6 +9,16 @@ class config_error(Exception):
 
 
 class Configuration():
+    
+    _instance_lock = threading.Lock()
+
+    def __new__(cls, *args, **kwargs):
+        if not hasattr(Configuration,"_instance"):
+            with Configuration._instance_lock:
+                if not hasattr(Configuration,"_instance"):
+                    Configuration._instance = object.__new__(cls)
+        return Configuration._instance
+    
     def __init__(self, *args, **kwargs):
         #simulation variables
         self.verbose = kwargs.get('verbose', True) #whether to print infections, recoveries and fatalities to the terminal

From 496a38e5406e0956388c017e53c349773cb96b04 Mon Sep 17 00:00:00 2001
From: mamushi641 <87245618+mamushi641@users.noreply.github.com>
Date: Sat, 7 Aug 2021 16:01:26 +0800
Subject: [PATCH 2/2] Update config.py

---
 config.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/config.py b/config.py
index 9182a53..74adb28 100644
--- a/config.py
+++ b/config.py
@@ -3,6 +3,7 @@
 '''
 
 import numpy as np
+import threading
 
 class config_error(Exception):
     pass