Error attempting to Run ArcPy Script in Anaconda's Spyder [closed]

Question

I'm attempting to switch over from running ArcPy scripts in Idle to running ArcPy scripts in Anaconda's Spyder GUI.

When I copy over the code and attempt to execute it, I get the following error:

File "C:\Program Files     (x86)\ArcGIS\Desktop10.3\arcpy\arcpy\geoprocessing\__init__.py", line 2, in <module>
from _base import *
ImportError: No module named '_base'

Here is the attached code:

import os
import sys
import string
import arcpy
from arcpy.sa import *
arcpy.CheckOutExtension("spatial")

workpath = "C:/workspace/gates/THRG/tmin_monthly_summaries/"
arcpy.env.workspace = workpath
tiffs = arcpy.ListRasters("*")
print (tiffs)