def walk(folder, depth=2, indent=""):
    try:
        pidls = folder.EnumObjects(0, shellcon.SHCONTF_FOLDERS)
    except shell.error:
        # no items
        return
    for pidl in pidls:
        dn = folder.GetDisplayNameOf(pidl, 
                                     shellcon.SHGDN_NORMAL)
        print indent, dn
        if depth:
            try:
                child = folder.BindToObject(pidl, None, 
                                      shell.IID_IShellFolder)
            except shell.error:
                pass
            else:
                walk(child, 1-depth, indent+" ")
dataset/ETHPy150Open Jackeriss/Email_My_PC/shell/demos/walk_shell_folders.py/walk/swapped operands of `-`