fix last mypy warnings

.gitignore

@@ -1,6 +1,7 @@
 build
 MANIFEST
 .mypy_cache/
-.venv2/
 dist/
-*.pyc
+*.pyc
+.venv*/
+purr.egg-info/

Purr/Plugins/local_pychart/bar_plot.py

@@ -21,7 +21,7 @@
 from . import pychart_util
 from .pychart_types import *
 
-fill_styles = None
+fill_styles = iter([])  # type: ignore
 
 _keys = {
     "direction": (StringType, "vertical",

Purr/Plugins/local_pychart/line_plot.py

@@ -23,7 +23,7 @@
 from .pychart_types import *
 
 default_width = 1.2
-line_style_itr = None
+line_style_itr = iter([])  # type: ignore
 
 _keys = {
     'data': (AnyType, None, pychart_util.data_desc),

Purr/Plugins/local_pychart/pie_plot.py

@@ -33,7 +33,7 @@ class T(chart_object.T):
         "radius": (UnitType, None, "The radius of the pie."),
         "line_style": (line_style.T, line_style.default, "The style of the outer edge of each pie slice."),
 
-        "fill_styles": (ListType, fill_style.standards.list(),
+        "fill_styles": (ListType, fill_style.standards.list(),  # type: ignore
                         """The fill style of each item. The length of the
                         list should be equal to the length of the data. 
                         """),

Purr/Plugins/local_pychart/rose_plot.py

@@ -30,7 +30,7 @@ class T(chart_object.T):
         "center": (CoordType, None, ""),
         "base_radius": (NumberType, None, ""),
         "line_style": (line_style.T, line_style.T(color=color.black, width=0.3), ""),
-        "fill_styles": (list, fill_style.standards.list()[:],
+        "fill_styles": (list, fill_style.standards.list()[:],  # type: ignore
                         """The fill style of each item. The length of the
                         list should be equal to the length of the data.
                         """),