util.py 文件源码

def py_where(program, path=None):
    # From: http://stackoverflow.com/a/377028/548792
    try:
        winprog_exts = tuple(p.upper() for p in os.environ['PATHEXT'].split(os.pathsep))
    except:
        winprog_exts = is_win and ('.BAT', 'COM', '.EXE') or ()

    def is_exec(fpath):
        return osp.isfile(fpath) and os.access(fpath, os.X_OK) and (
            os.name != 'nt' or not winprog_exts or any(fpath.upper().endswith(ext)
                                                       for ext in winprog_exts))

    progs = []
    if not path:
        path = os.environ["PATH"]
    for folder in path.split(os.pathsep):
        folder = folder.strip('"')
        if folder:
            exe_path = osp.join(folder, program)
            for f in [exe_path] + ['%s%s' % (exe_path, e) for e in winprog_exts]:
                if is_exec(f):
                    progs.append(f)
    return progs