Warning: the following requirements are not fully satisfied in the current scripts. This issue needs to be fixed.

Formatting

PEP8 with an exception of using 120-column-limit.

yapf users can easily ensure this rule by the following command:

find . -name "*.py" | xargs -I {} yapf --style='{based_on_style: pep8, column_limit: 120}' -i {}

Typing

mypy *.py --ignore-missing-import --strict --implicit-reexport

Note that the current codes do not satisfy this above condition. This needs to be fixed.

A function named create_XXX instantiates an bpy.types.Object/bpy.types.Node to the specified scene/node_tree. This function returns the newly created bpy.types.Object/bpy.types.Node.
A function named create_XXXs instantiates a set of bpy.types.Object/bpy.types.Node to the specified scene/node_tree. This function returns a tuple of the newly created bpy.types.Object/bpy.types.Node.
A function named build_XXX manipulates the specified scene/node_tree by various operations; for example, by instantiating a set of objects. This function does not return anything.
A function named set_XXX changes parameters of specified objects etc. This function does not instantiate new objects. This function does not return anything.
A function named add_XXX_constraint/modifier adds either a constraint or modifier to an object. This function does not instantiate new objects. This function does not return anything.
A function named add_XXX_YYY adds a data-block to data-blocks in bpy.data.YYYs. This function does not instantiate any bpy.types.Object/bpy.types.Node to scene/node_tree. This function returns the newly added YYY.

A variable named XXX_object (or object) has the type bpy.types.Object. In addition, an instance of bpy.types.Object that has its type of YYY (e.g., Mesh) should have a name like XXX_YYY_object (e.g., cube_mesh_object).
A variable named XXX_node (or node) has the type bpy.types.Node.
An instance of a subclass of bpy.types.ID, say bpy.type.Camera for example, should have a name like XXX_camera.