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Pypi.io -> Pypi.org (#14565)

pypi.io -> pypi.org

Modify binding mechanism to allow binding to one of a set of whitelisted commands, Add five such commands ("beginning_of_buffer", "end_of_buffer", "end_of_line", "forward_word", "unix_line_discard").

remove some cast_unicode

reformat

validate ESC_PAREN ('/') is followed by a callable name and not empty (#12690) When running a single python expression with just a slash - `/`, a tuple is returned. ```python In [1]: / Out[1]: () ``` This weird case happens because when a line starts with `/` the `inputtransformer` transforms it into a call of the first word after the `/` as the callable name and rest tokens after as arguments. This PR fixes that issue by validating that at least a callable name is given and it's not empty, if not a `SyntaxError` will be raised. ```python In [1]: / File "<ipython-input-1-8f27084b6294>", line 1 / ^ SyntaxError: invalid syntax In [2]: ``` Validated that tests are passing.

validate that ESC_PAREN ('/') is followed by a callable name and not empty

FIX: Typing annotations Running `mypy -p IPython.sphinxext` raised a few errors. Fix them and strip some trailing whitespace from a few places.

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