From 84c0ea13d00a68f27f4f7a08c45d2a542c5ea11f Mon Sep 17 00:00:00 2001
From: Declan Millar <declan.millar@ibm.com>
Date: Mon, 12 Sep 2022 21:11:27 +0100
Subject: [PATCH] Use lazy formatting in log messages

---
 qiskit/algorithms/minimum_eigensolvers/vqe.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/qiskit/algorithms/minimum_eigensolvers/vqe.py b/qiskit/algorithms/minimum_eigensolvers/vqe.py
index 47135b596d2d..eee636aefd28 100644
--- a/qiskit/algorithms/minimum_eigensolvers/vqe.py
+++ b/qiskit/algorithms/minimum_eigensolvers/vqe.py
@@ -188,7 +188,9 @@ def compute_minimum_eigenvalue(
         result.optimizer_time = eval_time
 
         logger.info(
-            f"Optimization complete in {eval_time} seconds.\nFound opt_params {result.optimal_point}."
+            "Optimization complete in %s seconds.\nFound opt_params %s",
+            eval_time,
+            result.optimal_point,
         )
 
         if aux_operators:
@@ -254,7 +256,7 @@ def _check_operator_ansatz(
         if operator.num_qubits != ansatz.num_qubits:
             try:
                 logger.info(
-                    f"Trying to resize ansatz to match operator on {operator.num_qubits} qubits."
+                    "Trying to resize ansatz to match operator on %s qubits.", operator.num_qubits
                 )
                 ansatz.num_qubits = operator.num_qubits
             except AttributeError as error: