fix issues with new versions of pandas and matplotlib (#117)

* fix issues with new versions of pandas and matplotlib

* support MIN as a key

Author: samuelduchesne

energy_pandas/energypandas.py

@@ -549,6 +549,8 @@ def plot3d(
                 y = z.index.values
 
                 x, y = meshgrid(x, y)
+                # Remove edgecolors from kwargs
+                kwargs.pop("edgecolors", None)
                 ax.contour3D(x, y, z.values, 150, cmap=cmap, **kwargs)
             else:
                 raise NameError('plot kind "{}" is not supported'.format(kind))
@@ -767,16 +769,16 @@ def plot2d(
 
             offset_n = f"{offset.n}-" if offset.n > 1 else ""
             ylabel = (
-                f"{offset_n}{RESOLUTION_NAME[offset.name]} of "
-                f"{RESOLUTION_NAME[yperiod.resolution_string][0:-1]}"
+                f"{offset_n}{RESOLUTION_NAME[str(offset.name).upper()]} of "
+                f"{RESOLUTION_NAME[yperiod.resolution_string.upper()][0:-1]}"
             )
 
         stacked, timeindex = tsam.unstackToPeriods(
             copy.deepcopy(self), int(periodlength)
         )
         if xlabel is None:
             xperiod = (periodlength * offset).delta
-            xlabel = f"{RESOLUTION_NAME[xperiod.resolution_string]}"
+            xlabel = f"{RESOLUTION_NAME[xperiod.resolution_string.upper()]}"
         cmap = plt.get_cmap(cmap)
         if vcenter is not None:
             norm = TwoSlopeNorm(vcenter, vmin=vmin, vmax=vmax)
@@ -820,6 +822,7 @@ def plot2d(
     D="Days",
     H="Hours",
     T="Minutes",
+    MIN="Minutes",
     S="Seconds",
     L="Milliseconds",
     U="Microseconds",

energy_pandas/plotting.py

@@ -144,12 +144,12 @@ def _plot_surface(ax, x, y, z, cmap=None, **kwargs):
         **kwargs:
     """
     if cmap is None:
-        cmap = cm.gist_earth
+        cmap = plt.get_cmap("gist_earth")
 
     ls = LightSource(270, 45)
     # To use a custom hillshading mode, override the built-in shading and pass
     # in the rgb colors of the shaded surface calculated from "shade".
-    rgb = ls.shade(z, cmap=cm.get_cmap(cmap), vert_exag=0.1, blend_mode="soft")
+    rgb = ls.shade(z, cmap=plt.get_cmap(cmap), vert_exag=0.1, blend_mode="soft")
     surf = ax.plot_surface(
         x,
         y,