IPython/nbconvert/transformers/__init__.py

# Class base Preprocessors
from .base import Preprocessor
from .convertfigures import ConvertFiguresPreprocessor
from .svg2pdf import SVG2PDFPreprocessor
from .extractoutput import ExtractOutputPreprocessor
from .revealhelp import RevealHelpPreprocessor
from .latex import LatexPreprocessor
from .sphinx import SphinxPreprocessor
from .csshtmlheader import CSSHTMLHeaderPreprocessor

# decorated function Preprocessors
from .coalescestreams import coalesce_streams