diff --git a/pypfopt/discrete_allocation.py b/pypfopt/discrete_allocation.py
index 11d00ee..d67f911 100644
--- a/pypfopt/discrete_allocation.py
+++ b/pypfopt/discrete_allocation.py
@@ -2,6 +2,7 @@
 The ``discrete_allocation`` module contains the ``DiscreteAllocation`` class, which
 offers multiple methods to generate a discrete portfolio allocation from continuous weights.
 """
+
 import collections
 
 import cvxpy as cp
diff --git a/pypfopt/plotting.py b/pypfopt/plotting.py
index e46c663..54fcf48 100644
--- a/pypfopt/plotting.py
+++ b/pypfopt/plotting.py
@@ -174,7 +174,7 @@ def _plot_cla(cla, points, ax, show_assets, show_tickers, interactive):
                 mode="markers",
                 name="Max Sharpe Portfolio",
                 marker=dict(size=12, symbol="x", color="coral"),
-                hovertemplate=f"Sharpe: %{{customdata[1]:.4}}<br>" + hovertemplate,
+                hovertemplate="Sharpe: %{{customdata[1]:.4}}<br>" + hovertemplate,
             )
         )
     else: