src/sage/plot/plot3d/plot3d.py: Sort imports, replace relative imports, separate out lazy_import

Author: Matthias Koeppe

src/sage/plot/plot3d/plot3d.py

@@ -147,16 +147,16 @@ def f(x,y): return math.exp(x/5)*math.cos(y)
 #                  https://www.gnu.org/licenses/
 # ****************************************************************************
 
-from .tri_plot import TrianglePlot
-from .index_face_set import IndexFaceSet
-from .shapes import arrow3d
-from .base import Graphics3dGroup
+from sage.misc.lazy_import import lazy_import
+from sage.misc.sageinspect import sage_getargspec, is_function_or_cython_function
 from sage.plot.colors import rainbow
-from .texture import Texture
+from sage.plot.plot3d.base import Graphics3dGroup
+from sage.plot.plot3d.index_face_set import IndexFaceSet
+from sage.plot.plot3d.shapes import arrow3d
+from sage.plot.plot3d.texture import Texture
+from sage.plot.plot3d.tri_plot import TrianglePlot
 
-from sage.misc.lazy_import import lazy_import
 lazy_import("sage.functions.trig", ["cos", "sin"])
-from sage.misc.sageinspect import sage_getargspec, is_function_or_cython_function
 
 
 class _Coordinates: