Working Example

config.py

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+import os
+
+basedir = os.path.abspath(os.path.dirname(__file__))
+
+
+class Config(object):
+    SECRET_KEY = os.environ.get("SECRET_KEY") or "dfsads1!FASASF231(*&FADSs"
+    SQLALCHEMY_DATABASE_URI = os.environ.get("DATABASE_URL") or "sqlite:///" + os.path.join(basedir, "app.db")
+    SQLALCHEMY_TRACK_MODIFICATIONS = False