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20161108 13:08:48 0500
 asked a question  Cannot use pip because pip is configured with locations that require TLS/SSL I installed pip by sage i pip , but when I use pip to install some python packages, it always gives the following error message:
sys:1: RuntimeWarning: not adding directory '' to sys.path since everybody can write to it.
Untrusted users could put files in this directory which might then be imported by your Python code. As a general precaution from similar exploits, you should not execute Python code from this directory
pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
Collecting octave_kernel
Could not fetch URL https://pypi.python.org/simple/octavekernel/: There was a problem confirming the ssl certificate: Can't connect to HTTPS URL because the SSL module is not available.  skipping
Could not find a version that satisfies the requirement octave_kernel (from versions: )
No matching distribution found for octave_kernel
Then I followed this post which says ./sage i pyopenssl , but this step fails for me also. 
20161108 12:39:16 0500
 commented answer  What packages in sage can I use in python? done! https://ask.sagemath.org/question/35483/whatdoesfromsageallimportdo/ (https://ask.sagemath.org/question/354...) 
20161108 12:38:49 0500
 asked a question  What does `from sage.all import *` do? This question is relatd with another one: What packages in sage can I use in python? How do I import Sage into a Python script told me that to use from sage.all import * to import sage packages in python. When I list the installed sage packages, there is igraph and pythonigraph. But from sage.all import * will not import them into python. I'd like to know, what kind of packages can be imported when I use from sage.all import * . BTW, the proper way to use igraph in python is import igraph with python_igraph installed. ps: My karma is insufficient to publish links. 
20161108 05:51:06 0500
 commented answer  What packages in sage can I use in python? Thanks! http://doc.sagemath.org/html/en/faq/faqusage.html#howdoiimportsageintoapythonscript (How do I import Sage into a Python script) told me that to use from sage.all import * to import sage packages. When I list the installed sage packages, there is igraph and pythonigraph. But from sage.all import * will not import them into python. I'd like to know, what kind of packages can be imported when I use from sage.all import * . 
20161107 07:38:14 0500
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20161107 07:38:10 0500
 commented answer  What packages in sage can I use in python? Thanks for your reply! I tested after I installed pythonigraph and igraph , they were still cannot be imported by python. Then I sage f python2 and now I can import igraph in python. And I wonder that why the only tutorial teaches from sage.all import * but not directly import somepackage ? 
20161107 07:21:03 0500
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20161107 06:41:52 0500
 commented question  Installing igraph I installed python_igraph successfully with sage i python_igraph , but I cannot import it after the installation. 
20161107 06:41:52 0500
 commented answer  Importing Python packages into Sage or Vice Versa When i run pip install pythonigraph it gives that
pip install python_igraph
pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
Collecting python_igraph
Could not fetch URL https://pypi.python.org/simple/pythonigraph/: There was a problem confirming the ssl certificate: Can't connect to HTTPS URL because the SSL module is not available.  skipping
Could not find a version that satisfies the requirement python_igraph (from versions: )
No matching distribution found for python_igraph
Could you teach me how to install it correctly? 
20161107 06:41:52 0500
 asked a question  What packages in sage can I use in python? As I know, there is not a good tutorial explainging how to import sage packages in python. When I list_packages of sage, it shows that numpy, scipy, python_igraph are installed. Then I want to import these packages in python with the following codes
from sage.all import *
I can use numpy, scipy while python_igraph does not work. Could anyone explain why numpy, scipy work while python_igraph does not? How to get python_igraph work? And what packages in sage can I use in python? Is there any explicit tutorial? 
20161107 06:41:51 0500
 answered a question  Installing igraph python_igraph is already included in the new SageMath 7.4. But I do not know how to import it in python. 