ZhigangPu

# check exsitence of file
import os
if not os.path.exists(file):                                                                                                       raise ValueError('The given requirements file does not exist.')

# get absolute path and set it as default path prefix
import os
from functools import partial
here = os.path.abspath(os.path.dirname(__file__))
get_path = partial(os.path.join, here)