Some pep:8ball: changes.

Ok the changes in default args are more than style changes… Just a heads up.
plotly · theengineear · Jan 9, 2017 · Jan 6, 2017 · Jan 6, 2017 · Jan 6, 2017
commit bcb6da0bf360043b793300d82de9b82f56d19d7d
diff --git a/plotly/figure_factory/_dendrogram.py b/plotly/figure_factory/_dendrogram.py
@@ -33,8 +33,10 @@ def create_dendrogram(X, orientation="bottom", labels=None,
     :param (str) orientation: 'top', 'right', 'bottom', or 'left'
     :param (list) labels: List of axis category labels(observation labels)
     :param (list) colorscale: Optional colorscale for dendrogram tree
-    :param (function) distfun: Function to compute the pairwise distance from the observations
-    :param (function) linkagefun: Function to compute the linkage matrix from the pairwise distances
+    :param (function) distfun: Function to compute the pairwise distance from
+                               the observations
+    :param (function) linkagefun: Function to compute the linkage matrix from
+                                  the pairwise distances
 
         clusters
 
@@ -106,7 +108,8 @@ class _Dendrogram(object):
 
     def __init__(self, X, orientation='bottom', labels=None, colorscale=None,
                  width="100%", height="100%", xaxis='xaxis', yaxis='yaxis',
-                 distfun=None, linkagefun=lambda x: sch.linkage(x, 'complete')):
+                 distfun=None,
+                 linkagefun=lambda x: sch.linkage(x, 'complete')):
         self.orientation = orientation
         self.labels = labels
         self.xaxis = xaxis
@@ -130,7 +133,9 @@ def __init__(self, X, orientation='bottom', labels=None, colorscale=None,
             distfun = scs.distance.pdist
 
         (dd_traces, xvals, yvals,
-            ordered_labels, leaves) = self.get_dendrogram_traces(X, colorscale, distfun, linkagefun)
+            ordered_labels, leaves) = self.get_dendrogram_traces(X, colorscale,
+                                                                 distfun,
+                                                                 linkagefun)
 
         self.labels = ordered_labels
         self.leaves = leaves
@@ -245,8 +250,10 @@ def get_dendrogram_traces(self, X, colorscale, distfun, linkagefun):
 
         :param (ndarray) X: Matrix of observations as array of arrays
         :param (list) colorscale: Color scale for dendrogram tree clusters
-        :param (function) distfun: Function to compute the pairwise distance from the observations
-        :param (function) linkagefun: Function to compute the linkage matrix from the pairwise distances
+        :param (function) distfun: Function to compute the pairwise distance
+                                   from the observations
+        :param (function) linkagefun: Function to compute the linkage matrix
+                                      from the pairwise distances
         :rtype (tuple): Contains all the traces in the following order:
             (a) trace_list: List of Plotly trace objects for dendrogram tree
             (b) icoord: All X points of the dendrogram tree as array of arrays

diff --git a/plotly/figure_factory/_distplot.py b/plotly/figure_factory/_distplot.py
@@ -52,7 +52,7 @@ def validate_distplot(hist_data, curve_type):
 
 
 def create_distplot(hist_data, group_labels, bin_size=1., curve_type='kde',
-                    colors=[], rug_text=[], histnorm=DEFAULT_HISTNORM,
+                    colors=None, rug_text=None, histnorm=DEFAULT_HISTNORM,
                     show_hist=True, show_curve=True, show_rug=True):
     """
     BETA function that creates a distplot similar to seaborn.distplot
@@ -169,6 +169,11 @@ def create_distplot(hist_data, group_labels, bin_size=1., curve_type='kde',
                              validate=False)
     ```
     """
+    if colors is None:
+        colors = []
+    if rug_text is None:
+        rug_text = []
+
     validate_distplot(hist_data, curve_type)
     utils.validate_equal_length(hist_data, group_labels)
 

diff --git a/plotly/figure_factory/_gantt.py b/plotly/figure_factory/_gantt.py
@@ -78,8 +78,7 @@ def gantt(chart, colors, title, bar_width, showgrid_x, showgrid_y, height,
         'opacity': 1,
         'line': {
             'width': 0,
-        },
-        'yref': 'y',
+        }
     }
     # create the list of task names
     for index in range(len(tasks)):
@@ -206,8 +205,7 @@ def gantt_colorscale(chart, colors, title, index_col, show_colorbar, bar_width,
         'opacity': 1,
         'line': {
             'width': 0,
-        },
-        'yref': 'y',
+        }
     }
 
     # compute the color for task based on indexing column
@@ -455,8 +453,7 @@ def gantt_dict(chart, colors, title, index_col, show_colorbar, bar_width,
         'opacity': 1,
         'line': {
             'width': 0,
-        },
-        'yref': 'y',
+        }
     }
 
     index_vals = []

diff --git a/plotly/figure_factory/_trisurf.py b/plotly/figure_factory/_trisurf.py
@@ -229,7 +229,7 @@ def create_trisurf(x, y, z, simplices, colormap=None, show_colorbar=True,
                    zerolinecolor='rgb(255, 255, 255)',
                    edges_color='rgb(50, 50, 50)',
                    height=800, width=800,
-                   aspectratio=dict(x=1, y=1, z=1)):
+                   aspectratio=None):
     """
     Returns figure for a triangulated surface plot
 
@@ -452,6 +452,8 @@ def dist_origin(x, y, z):
     py.iplot(fig, filename="trisurf-plot-modern-art")
     ```
     """
+    if aspectratio is None:
+        aspectratio = {'x': 1, 'y': 1, 'z': 1}
 
     # Validate colormap
     colors.validate_colors(colormap)