Improve async detection mechanism with blacklist...

Improve async detection mechanism with blacklist Because the async repl works by wrapping any code that raises SyntaxError in an async function and trying to execute it again, cell bodies that are invalid at the top level but valid in functions and methods (e.g. return and yield statements) currently allow executing invalid code. This patch blacklists return and yield statements outside of a function or method to restore the proper SyntaxError behavior.

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Writing code for Python 2 and 3

IPython 6 requires Python 3, so our compatibility module IPython.utils.py3compat is deprecated and will be removed in a future version. In most cases, we recommend you use the six module to support compatible code. This is widely used by other projects, so it is familiar to many developers and thoroughly battle-tested.

Our py3compat module provided some more specific unicode conversions than those offered by six. If you want to use these, copy them into your own code from IPython 5.x. Do not rely on importing them from IPython, as the module may be removed in the future.

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