Update __init__.py

Starting line 3960 within method drawlsmask I propose changing the use of numpy.concatenate to use np.hstack to achieve the stacking of the lsmask longitude array with itself. This is due to changes in numpy concatenate in NumPy version 1.10.0+ in which an IndexError will be raised if the axis of concatenation does not exist. Numpy.hstack will function the same way and persists in newer versions of NumPy.

Author: AvlWx2014

lib/mpl_toolkits/basemap/__init__.py

@@ -3960,10 +3960,14 @@ def drawlsmask(self,land_color="0.8",ocean_color="w",lsmask=None,
             if cylproj:
                 # stack grids side-by-side (in longitiudinal direction), so
                 # any range of longitudes may be plotted on a world map.
+                # in versions of NumPy later than 1.10.0, concatenate will
+                # not stack these arrays as expected. If axis 1 is outside
+                # the dimensions of the array, concatenate will now raise
+                # an IndexError. Using hstack instead.
                 lsmask_lons = \
-                        np.concatenate((lsmask_lons,lsmask_lons[1:]+360),1)
+                        np.hstack((lsmask_lons,lsmask_lons[1:] + 360))
                 lsmask = \
-                        np.concatenate((lsmask,lsmask[:,1:]),1)
+                        np.hstack((lsmask,lsmask[:,1:]))
         else:
             if lakes: lsmask = np.where(lsmask==2,np.array(0,np.uint8),lsmask)