utils module was added

ProgrammingLanguageLeader · ProgrammingLanguageLeader · Feb 28, 2019 · Feb 25, 2019 · Feb 28, 2019 · Feb 28, 2019
commit bc06c343ef6fc6b7d2713946ace823384c953b9b
diff --git a/utils/__init__.py b/utils/__init__.py
diff --git a/utils/singleton.py b/utils/singleton.py
@@ -0,0 +1,9 @@
+class Singleton:
+    def __init__(self, klass):
+        self.klass = klass
+        self.instance = None
+
+    def __call__(self, *args, **kwargs):
+        if not self.instance:
+            self.instance = self.klass(*args, **kwargs)
+        return self.instance