def uploadCSVfile1(token, ThePlaceTOupload):
files = {'file': open('E:\sample.csv','rb'),
(...)
def uploadCSVfile2(token, ThePlaceTOupload):
query_dict = {'file': open('E:\sample.csv','rb'),
(...)
open('E:\\sample.csv','rb')
open('E:/sample.csv','rb')
open(r'E:\sample.csv','rb')