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validate ESC_PAREN ('/') is followed by a callable name and not empty (#12690)...
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.

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test_exampleip.txt
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Tests in example form - IPython
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You can write text files with examples that use IPython prompts (as long as you
use the nose ipython doctest plugin), but you can not mix and match prompt
styles in a single file. That is, you either use all ``>>>`` prompts or all
IPython-style prompts. Your test suite *can* have both types, you just need to
put each type of example in a separate. Using IPython prompts, you can paste
directly from your session::
In [5]: s="Hello World"
In [6]: s.upper()
Out[6]: 'HELLO WORLD'
Another example::
In [8]: 1+3
Out[8]: 4
Just like in IPython docstrings, you can use all IPython syntax and features::
In [9]: !echo hello
hello
In [10]: a='hi'
In [11]: !echo $a
hi