终端可以打开模块，但IDLE不能

Question

我pip安装了plotly，一个用于在python上绘图的模块。当我从终端访问它时，它导入并完美地工作。但是，如果我尝试从IDLE访问它，则会抛出以下错误：

Traceback (most recent call last):
  File "<pyshell#13>", line 1
    from plotly import plotly
  File 
 "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-
packages/plotly/__init__.py", line 31
from plotly import (plotly, dashboard_objs, graph_objs, grid_objs, 
tools,
  File 
 "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-
packages/plotly/plotly/__init__.py", line 10
from . plotly import (
  File 
 "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-
 packages/plotly/plotly/plotly.py", line 28
     from requests.compat import json as _json
   File 
 "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-
 packages/requests/__init__.py", line 97
    from . import utils
   File 
 "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-
 packages/requests/utils.py", line 24
from . import certs
   File 
 "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-
 packages/requests/certs.py", line 15
     from certifi import where
ImportError: No module named certifi