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Python 3 is the most recently developed "edition" of python, superceding Python 2. It comes with numerous syntax alterations and performance improvements
When you run a Python program on Sololearn, the package gets sent to a remote server and interpreted there. The result of the code is then sent back. For this reason GUI apps and infinitely running apps wont work, as well as Django packages
CPython refers to the version of Python coded in the C language. It is the most widely used version (in fact Ive never seen another one). This is (mostly) behind the scenes stuff you dont need to worry about