RuntimeError: cannot open 'D:workdata emp est.shp'

#coding:utf8
import arcpy

path=r'D:workdata	emp	est.shp'



with arcpy.da.SearchCursor(path,'FID') as rows:
    print rows

上述代码报错：

Traceback (most recent call last):
File "D:/temp/test.py", line 11, in <module>
with arcpy.da.SearchCursor(path,'FID') as rows:
RuntimeError: cannot open 'D:workdata emp est.shp'

没找到原因，但是在这句之前如果设置了arcpy.env.workspace  或者执行了与文件路径相关的arcpy的函数之后就不报错了。