First pull request to Qiskit Metal

I sent a PR as a “draft” to Qiskit Metal for the first time: Execute import qiskit_metal without PySide2 #713.

The reason why I contributed

I joined in this project, cloud-ready, related to my first advocate activity, QAMP. The mentor, Marco, specified several things of the project and I had chosen an import issue as a top priority among them. It is an import error and this occurs when executing import qiskit_metal in the cloud environment. Our main project is providing Qiskit Metal as a service, similar to Composer or Lab in IBM Quantum: https://quantum-computing.ibm.com/. Therefore, it is a quite critical error which must be solved.

How I figured out the issue

First of all, the import error is from PySide2 and I found it occurs on linux environment: pyside2 installation problem on ubuntu18.04. The goal is to execute import qiskit_metal without an error so I found all PySide in the files of Qiskit Metal. *I have used mainly WSL (Windows Subsystem for Linux) on ubuntu 18.04.

grep -r 'PySide' .

I simply made all the lines to captions in __init__.py, linked to the files above. However, this method broke the whole program. (Captioned all in the end…) I need to find other ways.

Secondly, I deleted the folder _gui and removed lines which have the word, _gui with the command below.

sed -i '/_gui/d' <file_name>

This command remove lines which have the word _gui only and overwrite the file. I also used this with the word, PySide. *If you want to remove files including a specific word, execute the command below.

rm -f grep -r "<the specific word>" * -l`

Doing by trial and error, I found that I have to modify just four files to execute without PySide2. (Details are on my PR.) Lastly, I ran import qiskit_metal without PySide2. I used Anaconda so I do not have any error with PySide2 in my local. Hence, I removed it and then checked other programs work well. And… import qiskit_metal executed fine. No errors!

*This PR must be fixed to merge, but I just want to leave a log for my FIRST offical PR.

---

💬 Any comments and suggestions will be appreciated.