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Nope, they're now offering PyCharm Community Edition which is free to use for all and open source under the Apache 2 license.

So they actually did opensource it. Sorry, my mistake. Now the news is even better :)

Have you found the link to the source? I can't find it and so curious :)

The source code of PyCharm Community Ediion will be added to the IntelliJ IDEA Community Edition repository in the coming days.