Question: What are the necessary dll files to deploy an application using Qt? By necessary I mean those who are common to all applications, not the entire dll folder. Are msvr120.dll and msvc120.dll necessary too? Thanks to further answers.

Answer: 
I edited the shebang on the iPython executable from `#!/usr/bin/python` to `#/usr/local/bin/python3`, but I am not sure if this is a hacky or bad solution.
what work for me is changing #!/usr/bin/python to #! /usr/bin/python3 in file /usr/local/bin/ipython3

Just make sure that above address in all files coming out from '`whereis ipython3`' should be same.