print(__file__)
import os
print(os.path.dirname(__file__))

#sys.path python 默认去根据【】的路径去找模块

print(__file__)
import os
import sys
from lib.xx import aaa
print(os.path.dirname(__file__))
sys.path.append(os.path.dirname(__file__) + "/lib/xx")
for i in sys.path:
   print(i)

os.path.join