diff --git a/agate/mapped_sequence.py b/agate/mapped_sequence.py
index 7878d621..b87f215f 100644
--- a/agate/mapped_sequence.py
+++ b/agate/mapped_sequence.py
@@ -65,7 +65,7 @@ def __unicode__(self):
         if len(self) > 5:
             sample = '%s, ...' % sample
 
-        return '<agate.{}: ({})>'.format(type(self).__name__, sample)
+        return f'<agate.{type(self).__name__}: ({sample})>'
 
     def __str__(self):
         """
diff --git a/agate/table/__init__.py b/agate/table/__init__.py
index 8cb3b121..638c6b55 100644
--- a/agate/table/__init__.py
+++ b/agate/table/__init__.py
@@ -130,7 +130,7 @@ def __init__(self, rows, column_names=None, column_types=None, row_names=None, _
                     try:
                         row_values.append(cast_funcs[j](d))
                     except CastError as e:
-                        raise CastError(str(e) + ' Error at row {} column {}.'.format(i, self._column_names[j]))
+                        raise CastError(str(e) + f' Error at row {i} column {self._column_names[j]}.')
 
                 new_rows.append(Row(row_values, self._column_names))
         else:
diff --git a/agate/table/bins.py b/agate/table/bins.py
index 1f35c3cd..78608792 100644
--- a/agate/table/bins.py
+++ b/agate/table/bins.py
@@ -63,7 +63,7 @@ def name_bin(i, j, first_exclusive=True, last_exclusive=False):
         exclusive = format_decimal(j, format=break_formatter)
 
         output = '[' if first_exclusive else '('
-        output += '{} - {}'.format(inclusive, exclusive)
+        output += f'{inclusive} - {exclusive}'
         output += ']' if last_exclusive else ')'
 
         return output
diff --git a/agate/table/print_bars.py b/agate/table/print_bars.py
index 23f89348..25dc3a2d 100644
--- a/agate/table/print_bars.py
+++ b/agate/table/print_bars.py
@@ -175,7 +175,7 @@ def write(line):
         output.write(line + '\n')
 
     # Chart top
-    top_line = '{} {}'.format(y_label.ljust(max_label_width), x_label.rjust(max_value_width))
+    top_line = f'{y_label.ljust(max_label_width)} {x_label.rjust(max_value_width)}'
     write(top_line)
 
     # Bars
@@ -210,7 +210,7 @@ def write(line):
 
         bar = bar.ljust(plot_width)
 
-        write('{} {} {}'.format(label_text, value_text, bar))
+        write(f'{label_text} {value_text} {bar}')
 
     # Axis & ticks
     axis = horizontal_line * plot_width
diff --git a/agate/table/print_table.py b/agate/table/print_table.py
index 0ad5c5af..6d502f5a 100644
--- a/agate/table/print_table.py
+++ b/agate/table/print_table.py
@@ -137,7 +137,7 @@ def write_row(formatted_row):
 
         text = v_line.join(row_output)
 
-        write('{}{}{}'.format(v_line, text, v_line))
+        write(f'{v_line}{text}{v_line}')
 
     divider = '{v_line} {columns} {v_line}'.format(
         v_line=v_line,
diff --git a/tests/test_py3.py b/tests/test_py3.py
index f3a561a5..c50f4ea1 100644
--- a/tests/test_py3.py
+++ b/tests/test_py3.py
@@ -240,5 +240,5 @@ def test_sniffer(self):
             actual = csv_py3.Sniffer().sniff(contents).__dict__
             expected = csv.Sniffer().sniff(contents).__dict__
 
-            self.assertEqual(direct, expected, '{!r} != {!r}'.format(direct, expected))
-            self.assertEqual(actual, expected, '{!r} != {!r}'.format(actual, expected))
+            self.assertEqual(direct, expected, f'{direct!r} != {expected!r}')
+            self.assertEqual(actual, expected, f'{actual!r} != {expected!r}')