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-rw-r--r--src/saml2/s2repoze/plugins/formswithhidden.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/saml2/s2repoze/plugins/formswithhidden.py b/src/saml2/s2repoze/plugins/formswithhidden.py
index 1483af92..8c120f07 100644
--- a/src/saml2/s2repoze/plugins/formswithhidden.py
+++ b/src/saml2/s2repoze/plugins/formswithhidden.py
@@ -92,7 +92,7 @@ class FormHiddenPlugin(FormPlugin):
query = parse_dict_querystring(environ)
hidden = []
for key, val in query.items():
- hidden.append(HIDDEN_PRE_LINE % ("_%s_" % key, val))
+ hidden.append(HIDDEN_PRE_LINE % (f"_{key}_", val))
logger.info("hidden: %s", hidden)
form = self.formbody or _DEFAULT_FORM