修改
来自python.org的官方python 2.7.11安装程序有一个主要错误（来自嵌入式CPython的PyInitialize导致硬崩溃），这可以通过遵循此错误报告中的说明来避免：
https://bugs.python.org/issue25824
ORIGINAL
安装新软件包时是否可以阻止conda在Windows上更新python？问题是我需要使用官方CPython安装。
e.g。
conda install numba
Fetching package metadata: ....
Solving package specifications: .........
Package plan for installation in environment C:\Python\Python27_32b:
The following packages will be downloaded:
package | build
---------------------------|-----------------
python-2.7.11 | 4 22.3 MB
enum34-1.1.2 | py27_0 54 KB
funcsigs-0.4 | py27_0 19 KB
numpy-1.10.4 | py27_0 2.8 MB
llvmlite-0.10.0 | py27_0 4.6 MB
numexpr-2.5.1 | np110py27_0 141 KB
scipy-0.17.0 | np110py27_0 10.8 MB
numba-0.25.0 | np110py27_0 1.6 MB
scikit-learn-0.17.1 | np110py27_0 3.3 MB
------------------------------------------------------------
Total: 45.5 MB
The following NEW packages will be INSTALLED:
enum34: 1.1.2-py27_0
funcsigs: 0.4-py27_0
llvmlite: 0.10.0-py27_0
numba: 0.25.0-np110py27_0
pip: 8.1.1-py27_1
python: 2.7.11-4
The following packages will be UPDATED:
numexpr: 2.5.1-np111py27_0 --> 2.5.1-np110py27_0
scikit-learn: 0.17.1-np111py27_0 --> 0.17.1-np110py27_0
scipy: 0.17.0-np111py27_0 --> 0.17.0-np110py27_0
The following packages will be DOWNGRADED:
numpy: 1.11.0-py27_0 --> 1.10.4-py27_0
Proceed ([y]/n)?