diff --git a/examples/text_labels_and_annotations/arrow_demo.py b/examples/text_labels_and_annotations/arrow_demo.py
index c76bf4e5962d..2f6b5933b007 100644
--- a/examples/text_labels_and_annotations/arrow_demo.py
+++ b/examples/text_labels_and_annotations/arrow_demo.py
@@ -147,10 +147,7 @@ def do_fontsize(k):
 
     if normalize_data:
         # find maximum value for rates, i.e. where keys are 2 chars long
-        max_val = 0
-        for k, v in data.items():
-            if len(k) == 2:
-                max_val = max(max_val, v)
+        max_val = max((v for k, v in data.items() if len(k) == 2), default=0)
         # divide rates by max val, multiply by arrow scale factor
         for k, v in data.items():
             data[k] = v / max_val * sf
@@ -158,8 +155,8 @@ def do_fontsize(k):
     def draw_arrow(pair, alpha=alpha, ec=ec, labelcolor=labelcolor):
         # set the length of the arrow
         if display == 'length':
-            length = max_head_length + data[pair] / sf * (max_arrow_length -
-                                                          max_head_length)
+            length = (max_head_length
+                      + data[pair] / sf * (max_arrow_length - max_head_length))
         else:
             length = max_arrow_length
         # set the transparency of the arrow
diff --git a/lib/matplotlib/backends/backend_pdf.py b/lib/matplotlib/backends/backend_pdf.py
index aa1b8bdd5fc6..8e2818f098e1 100644
--- a/lib/matplotlib/backends/backend_pdf.py
+++ b/lib/matplotlib/backends/backend_pdf.py
@@ -1896,7 +1896,7 @@ def draw_tex(self, gc, x, y, s, prop, angle, ismath='TeX!', mtext=None):
         fontsize = prop.get_size_in_points()
         dvifile = texmanager.make_dvi(s, fontsize)
         with dviread.Dvi(dvifile, 72) as dvi:
-            page = next(iter(dvi))
+            page, = dvi
 
         # Gather font information and do some setup for combining
         # characters into strings. The variable seq will contain a
diff --git a/lib/matplotlib/lines.py b/lib/matplotlib/lines.py
index 0166439bb4d2..149c5c09238d 100644
--- a/lib/matplotlib/lines.py
+++ b/lib/matplotlib/lines.py
@@ -657,7 +657,7 @@ def set_data(self, *args):
         *args : (N, 2) array or two 1D arrays
         """
         if len(args) == 1:
-            x, y = args[0]
+            (x, y), = args
         else:
             x, y = args
 
@@ -763,8 +763,8 @@ def draw(self, renderer):
         self.ind_offset = 0  # Needed for contains() method.
         if self._subslice and self.axes:
             x0, x1 = self.axes.get_xbound()
-            i0, = self._x_filled.searchsorted([x0], 'left')
-            i1, = self._x_filled.searchsorted([x1], 'right')
+            i0 = self._x_filled.searchsorted(x0, 'left')
+            i1 = self._x_filled.searchsorted(x1, 'right')
             subslice = slice(max(i0 - 1, 0), i1 + 1)
             self.ind_offset = subslice.start
             self._transform_path(subslice)
diff --git a/lib/matplotlib/style/core.py b/lib/matplotlib/style/core.py
index 05a7e660b161..715d479e1199 100644
--- a/lib/matplotlib/style/core.py
+++ b/lib/matplotlib/style/core.py
@@ -178,7 +178,7 @@ def iter_style_files(style_dir):
         if is_style_file(filename):
             match = STYLE_FILE_PATTERN.match(filename)
             path = os.path.abspath(os.path.join(style_dir, path))
-            yield path, match.groups()[0]
+            yield path, match.group(1)
 
 
 def read_style_directory(style_dir):
diff --git a/lib/matplotlib/table.py b/lib/matplotlib/table.py
index 6640abfecc20..8fb0ed206d09 100644
--- a/lib/matplotlib/table.py
+++ b/lib/matplotlib/table.py
@@ -518,17 +518,11 @@ def auto_set_column_width(self, col):
 
     def _auto_set_column_width(self, col, renderer):
         """Automatically set width for column."""
-        cells = [key for key in self._cells if key[1] == col]
-
-        # find max width
-        width = 0
-        for cell in cells:
-            c = self._cells[cell]
-            width = max(c.get_required_width(renderer), width)
-
-        # Now set the widths
+        cells = [cell for key, cell in self._cells.items() if key[1] == col]
+        max_width = max((cell.get_required_width(renderer) for cell in cells),
+                        default=0)
         for cell in cells:
-            self._cells[cell].set_width(width)
+            cell.set_width(max_width)
 
     def auto_set_font_size(self, value=True):
         """ Automatically set font size. """
diff --git a/lib/matplotlib/texmanager.py b/lib/matplotlib/texmanager.py
index 3841be4ecad4..98dcb8bb5ca9 100644
--- a/lib/matplotlib/texmanager.py
+++ b/lib/matplotlib/texmanager.py
@@ -463,6 +463,6 @@ def get_text_width_height_descent(self, tex, fontsize, renderer=None):
             # use dviread. It sometimes returns a wrong descent.
             dvifile = self.make_dvi(tex, fontsize)
             with dviread.Dvi(dvifile, 72 * dpi_fraction) as dvi:
-                page = next(iter(dvi))
+                page, = dvi
             # A total height (including the descent) needs to be returned.
             return page.width, page.height + page.descent, page.descent