How can I upgrade Numpy in just one version of Python?

Question

I am trying to get OpenCV working, but the issue with this is that my Python27 Numpp version is too old. Every time I write "install --upgrade numpy", I am told that Numpy is already up to date in C:Python37. How can I update Numpy in C:Python27 rather than 37? Any help would be much appreciated.

The version of pip is tied to a specific Python installation. So pip on my computer works for Python 3.7, while pip2 is for Python 2.7. Are you sure you're using the correct version of pip. — bnaecker
– bnaecker, Commented Feb 14, 2019 at 5:06
@bnaecker I am using pip3, I think this is the issue. My computer doesn't seem to recognize 'pip2'. How can I run install numpy using pip2? — Bob Samuels
– Bob Samuels, Commented Feb 14, 2019 at 5:11
It may just be called pip on your machine. If you do pip --version, that will tell you exactly which version. It may also be called pip2.7 or something more specific. — bnaecker
– bnaecker, Commented Feb 14, 2019 at 5:13

Andrew Franklin · Accepted Answer · 2019-02-14 05:49:44Z

3

Forgive me as I am on a mac, but I think a similar command should work on windows:

<path/to/particular/version/of/python> -m pip install numpy==<version number>

As an example from my machine:

$ # numpy versions before changes
$ python3.6 -m pip list | grep numpy
numpy                  1.14.5
$ python3.7 -m pip list | grep numpy
numpy                    1.15.2

$ # updating numpy for python3.6
$ python3.6 -m pip install numpy==1.16.1
.
.
.

$ # numpy versions after changes
$ python3.6 -m pip list | grep numpy
numpy                  1.16.1
$ python3.7 -m pip list | grep numpy
numpy                    1.15.2

edited Feb 14, 2019 at 5:49

answered Feb 14, 2019 at 5:42

Andrew Franklin

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JCutrer · Accepted Answer · 2019-02-14 05:21:03Z

0

I assume you are running pip install --upgrade numpy

Try where pip and where python to get an idea of which version of python your are executing pip from. Use which pip instead on Mac or Linux.

I assume it will return c:\python27\Scripts\pip.exe if so then try...

c:\python27\Scripts\pip.exe install --upgrade numpy

edited Feb 14, 2019 at 5:21

answered Feb 14, 2019 at 5:08

JCutrer

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Shariq · Accepted Answer · 2019-02-14 05:28:51Z

0

Extending the first answer by JCutrer, after installing numpy on the specified version, you need to run the python.exe interpreter of the specified version.

So, assuming you did
c:\python27\Scripts\pip.exe install --upgrade numpy, the libraries have been installed for python27, now you can run python from the below path, or set this path as interpreter in your IDE.

c:\python27\bin\python27.exe (or python.exe)

answered Feb 14, 2019 at 5:28

Shariq

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1 Comment

Shariq Over a year ago

If you only want to use python27, you can also set it default globally by editing Environment Variables.

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