CLN Replace format in test_repr_info (#31639)

Author: thomasjpfan

pandas/tests/frame/test_repr_info.py

@@ -223,8 +223,7 @@ def test_info_verbose(self):
 
         for i, line in enumerate(lines):
             if i >= start and i < start + size:
-                index = i - start
-                line_nr = " {} ".format(index)
+                line_nr = f" {i - start} "
                 assert line.startswith(line_nr)
 
     def test_info_memory(self):
@@ -236,18 +235,16 @@ def test_info_memory(self):
         bytes = float(df.memory_usage().sum())
 
         expected = textwrap.dedent(
-            """\
+            f"""\
         <class 'pandas.core.frame.DataFrame'>
         RangeIndex: 2 entries, 0 to 1
         Data columns (total 1 columns):
          #   Column  Non-Null Count  Dtype
         ---  ------  --------------  -----
          0   a       2 non-null      int64
         dtypes: int64(1)
-        memory usage: {} bytes
-        """.format(
-                bytes
-            )
+        memory usage: {bytes} bytes
+        """
         )
 
         assert result == expected
@@ -313,9 +310,7 @@ def test_info_shows_column_dtypes(self):
         )
         assert header in res
         for i, dtype in enumerate(dtypes):
-            name = " {i:d}   {i:d}       {n:d} non-null     {dtype}".format(
-                i=i, n=n, dtype=dtype
-            )
+            name = f" {i:d}   {i:d}       {n:d} non-null     {dtype}"
             assert name in res
 
     def test_info_max_cols(self):