I'm currently trying to develop a LAStools specific routine, setting all the parameters for lasheight then using the output of that to run lasclassify. The closest thing I've found to being able to write this in python is in https://gis.stackexchange.com/questions/191045

In the above post I'm a bit curious where the input and output .las files are. Also, not exactly sure how that Bat functionality is working. Does anyone have an example of a complete script they would be willing to post? 

EDIT: Here's what I have so far, I can't seem to get it to work though. I think it has something to do with the environments setting.  I'm running the exact text from the bat file in the command line and it's working now that I updated the default PATH to where my LAStools bin folder is.

    import os, random, sys, subprocess

    input_path = "D:\Working_D\LAStools_scratch\input\\*.laz"
    height_path = "D:\Working_D\LAStools_scratch\height"
    arg_cores = "-cores 16"

    directory = r'D:\Working_D\scripts\batch_files'
    with open(os.path.join(directory, 'batch_temp.bat'), 'w') as OPATH:
          OPATH.writelines(["lasheight ",
                            "-i {0} ".format('"' + input_path + '"'),
                            "{0} ".format(arg_cores),
                            "{0} ".format("-odir"),
                            "{0} ".format('"' + height_path + '"'),
                            "{0} ".format("-olaz"),
                            "\n "])

    BatFile = 'D:\Working_D\scripts\batch_files\batch_temp.bat'

    proc=subprocess.Popen(BatFile,stdout=subprocess.PIPE,stderr=subprocess.PIPE,shell=True)
    output,error=proc.communicate()

    os.remove(BatFile)

    print 'process complete.'