explain defaults

import numpy as np

import os

import re

from shutil import which

import subprocess

import sys

opt = dict()

def measure_data(time):

    # libmsp430.so must be available

    if not 'LD_LIBRARY_PATH' in os.environ:

        os.environ['LD_LIBRARY_PATH'] = '{}/var/projects/msp430/MSP430Flasher_1.3.7'.format(os.environ['HOME'])

    # https://github.com/carrotIndustries/energytrace-util must be available

    energytrace_cmd = 'energytrace'

    if which(energytrace_cmd) is None:

        energytrace_cmd = '{}/var/source/energytrace-util/energytrace'.format(os.environ['HOME'])

    res = subprocess.run([energytrace_cmd, str(duration)], stdout = subprocess.PIPE, universal_newlines = True)