How to Create a Python3 Virtual Environment with VirtualEnv?

To create a virtual environment running Python version 3 using VirtualEnv run the following command:

virtualenv env_name -p python3

We use the -p  option to specify the version of Python we want to use. Without this, it will default to Python version 2 which comes installed by default on macOS.

After activating the virtual environment with source bin/activate , run python --version  to show the version of python in use.

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How to Fix the “DNS_PROBE_FINISHED_NXDOMAIN” error on macOS?

I got a brand new MacBook few weeks ago and I have been having an DNS_PROBE_FINISHED_NXDOMAIN  error while trying to access one of our web apps at work.

After some time researching the cause of the error, I found out that it was due the DNS settings on my MacBook for the Wifi network I was using. If you are having the same issue, here is how I solved it:

  • Open System Preferences… 
  • Click on Network

  • With WiFi selected in the service column, click on the Advanced… button.

  • In the Advanced… window, click on the DNS tab. It should look like below

  • Under the DNS Servers column, click on the + icon to add a new DNS server address. Add the 8.8.8.8
  • Add also the 8.8.4.4. address.
  • Reorder the addresses as by dragging and dropping them as below:

  • Click on the OK button
  • To finalise, click on the Apply button.

That’s it! Refresh the web page you are trying to access in your browser and it should not work.

 

 

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Compressing and Extracting with Zip in the Terminal

Compressing a folder:

Note: With the -X option, you are compressing without the invisible files such as “_MACOSX” or “._Filename”

Extracting an archive: