diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
index 194f2f63cbaa..85c5ada67dfe 100644
--- a/lib/matplotlib/axes/_base.py
+++ b/lib/matplotlib/axes/_base.py
@@ -197,7 +197,7 @@ def _process_plot_format(fmt):
i += 2
else:
raise ValueError(
- 'Unrecognized character %c in format string' % c)
+ f'Unrecognized character {c} in format string {fmt!r}')
if linestyle is None and marker is None:
linestyle = mpl.rcParams['lines.linestyle']
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