arcpy.da.SearchCursor RuntimeError: cannot open '.shp'

arcpy在使用arcpy.da.SearchCursor读取shp时报错RuntimeError: cannot open '.shp'，代码如下：

#coding:utf8
import arcpy

path=r'D:\work\data\temp\test.shp'
with arcpy.da.SearchCursor(path,'FID') as rows:
    print rows

错误信息：

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:\work\data\temp\test.shp'

解决方法：

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。例如：

arcpy.env.workspace = r'D:\work\data\temp'