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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def run(self, *args, **kwargs):
 """ The run method is merely a thin shim down to the embedded pftree run method. """

        b_status            = True
        d_pftreeRun         = {}
        d_inputAnalysis     = {}
        d_env               = self.env_check()
        b_timerStart        = False

        self.dp.qprint(
                "\tStarting pfdicom run... (please be patient while running)", 
                level = 1
                )

        for k, v in kwargs.items():
            if k == 'timerStart':   b_timerStart    = bool(v)

        if b_timerStart:
            other.tic()

        if d_env['status']:
            d_pftreeRun = self.pf_tree.run(timerStart = False)
        else:
            b_status    = False 

        str_startDir    = os.getcwd()
        os.chdir(self.str_inputDir)
        if b_status:
            if len(self.str_extension):
                d_inputAnalysis = self.pf_tree.tree_process(
                                inputReadCallback       = None,
                                analysisCallback        = self.filelist_prune,
                                outputWriteCallback     = None,
                                applyResultsTo          = 'inputTree',
                                applyKey                = 'l_file',
                                persistAnalysisResults  = True
                )
        os.chdir(str_startDir)

        d_ret = {
            'status':           b_status and d_pftreeRun['status'],
            'd_env':            d_env,
            'd_pftreeRun':      d_pftreeRun,
            'd_inputAnalysis':  d_inputAnalysis,
            'runTime':          other.toc()
        }

        if self.b_json:
            self.ret_dump(d_ret, **kwargs)

        self.dp.qprint('\tReturning from pfdicom run...', level = 1)

        return d_ret