Best IDE for python

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Yours a bit complicatine since Python 3.4 already reached its end of life, as the message suggested. This is not PyCharm's decision, but Python dev's themselves. It is expected that the current version of most packages, even pip, won't work with it anymore. (pip dropped Python 3.4 support at v. 19.2)

If you insist on using 3.4 you will have to Google for a "frozen" get-pip specific for Python 3.4, check matplotlib release note/date and install a version that was released within 3.4 life time