文件路径获取

import sys
print(sys.argv[0])

输出：D:/git/autotest/all_cluster_test/a_biz/excel_process.py

绝对路径转相对路径

import os
print os.path.relpath("D:/git/autotest/all_cluster_test/a_testdata/demo.xlsx")

输出：..\a_testdata\demo.xlsx

相对路径转绝对路径

import os
print os.path.abspath('../a_testdata/demo.xlsx')

输出：D:/git/autotest/all_cluster_test/a_testdata/demo.xlsx