fix preamble for matplotlib v2

Author: amueller

preamble.py

@@ -5,23 +5,20 @@
 import mglearn
 from cycler import cycler
 
-#set_matplotlib_formats('png', 'svg')
 set_matplotlib_formats('pdf', 'png')
 plt.rcParams['savefig.dpi'] = 300
 plt.rcParams['image.cmap'] = "viridis"
 plt.rcParams['image.interpolation'] = "none"
 plt.rcParams['savefig.bbox'] = "tight"
 plt.rcParams['lines.linewidth'] = 2
 plt.rcParams['legend.numpoints'] = 1
-plt.rc('axes', prop_cycle=(cycler('color', mglearn.plot_helpers.cm_cycle.colors) +
-                           cycler('linestyle', ['-', '--', ':',
-                                                '-.', '--'])
-                           )
-       )
+plt.rc('axes', prop_cycle=(
+    cycler('color', mglearn.plot_helpers.cm_cycle.colors) +
+    cycler('linestyle', ['-', '-', "--", (0, (3, 3)), (0, (1.5, 1.5))])))
 
 np.set_printoptions(precision=3, suppress=True)
 
 pd.set_option("display.max_columns", 8)
 pd.set_option('precision', 2)
 
-np, mglearn
+__all__ = ['np', 'mglearn', 'display', 'plt', 'pd']