docs: update the error messages for using unsupported Pythons

g2p/deprecation.py

@@ -9,9 +9,10 @@
 
 import g2p._version
 
-if sys.version_info < (3, 6):  # pragma: no cover
+if sys.version_info < (3, 7):  # pragma: no cover
     sys.exit(
-        f"Python 3.6 or more recent is required by g2p. You are using {sys.version}.\n"
+        "Python 3.7 or more recent is required by g2p.\n"
+        f"You are using Python {sys.version}.\n"
         "Please use a newer version of Python."
     )
 

g2p/tests/test_studio.py

@@ -12,9 +12,18 @@
     gunicorn --worker-class eventlet  -w 1 g2p.app:APP --no-sendfile --bind 0.0.0.0:5000 --daemon
 """
 
+import sys
 from datetime import datetime
 from random import sample
 
+if sys.version_info < (3, 8):  # pragma: no cover
+    sys.exit(
+        "g2p/tests/test_studio.py relies on unittest.IsolatedAsyncioTestCase,\n"
+        "which is only available in Python 3.8 or later.\n"
+        f"You are using Python {sys.version}."
+        "Please use a newer version of Python."
+    )
+
 # flake8: noqa: C901
 from unittest import IsolatedAsyncioTestCase, main