Placeholders in some error will use curly brackets

This way, it will remain visible even if it is rendered on web.

The choice of curly brackets is influenced by URL Template RFC 6570.

Author: rayluo

msal/authority.py

@@ -163,9 +163,9 @@ def canonicalize(authority_or_auth_endpoint):
     raise ValueError(
         "Your given address (%s) should consist of "
         "an https url with a minimum of one segment in a path: e.g. "
-        "https://login.microsoftonline.com/<tenant> "
-        "or https://<tenant_name>.ciamlogin.com/<tenant> "
-        "or https://<tenant_name>.b2clogin.com/<tenant_name>.onmicrosoft.com/policy"
+        "https://login.microsoftonline.com/{tenant} "
+        "or https://{tenant_name}.ciamlogin.com/{tenant} "
+        "or https://{tenant_name}.b2clogin.com/{tenant_name}.onmicrosoft.com/policy"
         % authority_or_auth_endpoint)
 
 def _instance_discovery(url, http_client, instance_discovery_endpoint, **kwargs):