import bpy

#Remove default Cube
def delete_all():
    for item in bpy.context.scene.objects:
        bpy.context.scene.objects.unlink(item)

    for item in bpy.data.objects:
        bpy.data.objects.remove(item)

    for item in bpy.data.meshes:
        bpy.data.meshes.remove(item)

    for item in bpy.data.materials:
        bpy.data.materials.remove(item)

delete_all()

#Define vertex coordinates
coords=[
    (-1.0, -1.0, -1.0),
    ( 1.0, -1.0, -1.0),
    ( 1.0,  1.0, -1.0),
    (-1.0,  1.0, -1.0),
    ( 0.0,  0.0,  1.0)
]

#Define a face using this subscript
#Each face is defined by a sequence of four integers
#Triangular face must have the same first and fourth vertices
faces=[
    (2,1,0,3),
    (0,1,4,0),
    (1,2,4,1),
    (2,3,4,2),
    (3,0,4,3)
]

#Create a new mesh
me          = bpy.data.meshes.new("PyramidMesh")
#Create an object with a mesh
ob          = bpy.data.objects.new("Pyramid", me)
#Place the object at the 3D cursor position
ob.location = bpy.context.scene.cursor_location
#Link objects to scenes
bpy.context.scene.objects.link(ob)
#Fill the vertices, edges, and faces of the mesh
me.from_pydata(coords,[],faces)
#Update mesh with new data
me.update(calc_edges=True)

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