I can't install 'pip' for python

Whenever I've installed pip on my Windows machine, it installs to my Python's Scripts folder:

c:\Python34\Scripts

So to get pip to run on the command line, I had to add that path to my PATH environment variable. You can get to those settings by doing the following (assuming Windows 7 or newer):

1. Right click My Computer and choose Properties
2. Go to Advanced system settings
3. Click on the Environment Variables button
4. Double-click the PATH (or Path) variable listed under System variables
5. Add c:\Python34\Scripts to the end of the list of other paths making sure that it is separated from the previous entry with a semi-colon

Restart your shell and try running pip. If it still doesn't work, you need to find out where pip got installed. In my Scripts folder, I have a pip.exe file. If you do not, then adding the Scripts folder to your path won't help. You'll have to figure out where it got installed and add that path instead.

You can copy zklib in the odoo server folder and restart the odoo server and it should work.

For windows users If the above solution does not help then make sure your python folder is in the right place to do so, go to the windows search bar and type python then right-click open location folder and copy the path and paste it in the environment variables

for more explanation check the following [link ]: https://www.youtube.com/watch?v=i4yJi-cpwWk