Try to automatically find Stata executable about stata_kernel HOT 4 CLOSED

from glob import glob
import os


def is_exe(fpath):
    return os.path.isfile(fpath) and os.access(fpath, os.X_OK)


def which(program):
    fpath, fname = os.path.split(program)
    if fpath:
        if is_exe(program):
            return program
        else:
            matches  = glob(program)
            exe_list = []
            for p in matches:
                if is_exe(p):
                    exe_list += [p]

            if len(exe_list) > 0:
                return exe_list
    else:
        for path in os.environ["PATH"].split(os.pathsep):
            exe_file = os.path.join(path, program)
            if is_exe(exe_file):
                return exe_file

        exe_list = []
        for path in os.environ["PATH"].split(os.pathsep):
            exe_file = os.path.join(path, program)
            matches  = glob(exe_file)
            for p in matches:
                if is_exe(p):
                    exe_list += [p]

        if len(exe_list) > 0:
            return exe_list

    return None