(python2.7) (23:28:22) ~$ python
Python 2.7.14 |Anaconda, Inc.| (default, Dec 7 2017, 17:05:42)
[GCC 7.2.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import six
>>> six.__version__
'1.5.2'
>>> quit()
(python2.7) (23:30:09) ~$ conda install six
Fetching package metadata ...........
Solving package specifications: .
# All requested packages already installed.
# packages in environment at /home/hyejinj/anaconda3/envs/python2.7:
#
six 1.11.0 py27h5f960f1_1
我需要版本为1.11.0的六个软件包，但我在conda环境中的python仍然使用默认的六个版本，其版本为1.5.2。我该如何解决这个问题？