Autoreload 3 feature

Example: When an IPython session is ran with the 'autoreload' extension loaded, you will now have the option '3' to select which means the following:

1. replicate all functionality from option 2
2. autoload all new funcs/classes/enums/globals from the module when they're added
3. autoload all newly imported funcs/classes/enums/globals from external modules

Try %autoreload 3 in an IPython session after running %load_ext autoreload

For more information please see unit test -

extensions/tests/test_autoreload.py : 'test_autoload_newly_added_objects'

History Range Glob feature

Previously, when using %history, users could specify either a range of sessions and lines, for example:

~8/1-~6/5   # see history from the first line of 8 sessions ago,
            # to the fifth line of 6 sessions ago.``

Or users could specify a glob pattern:

-g <pattern>  # glob ALL history for the specified pattern.

However users could not specify both.

If a user did specify both a range and a glob pattern, then the glob pattern would be used (globbing all history) and the range would be ignored.

---

With this enhancement, if a user specifies both a range and a glob pattern, then the glob pattern will be applied to the specified range of history.

Automatic Vi prompt stripping

When pasting code into IPython, it will strip the leading prompt characters if there are any. For example, you can paste the following code into the console - it will still work, even though each line is prefixed with prompts (In, Out):

In [1]: 2 * 2 == 4
Out[1]: True

In [2]: print("This still works as pasted")

Previously, this was not the case for the Vi-mode prompts:

In [1]: [ins] In [13]: 2 * 2 == 4
   ...: Out[13]: True
   ...:
  File "<ipython-input-1-727bb88eaf33>", line 1
    [ins] In [13]: 2 * 2 == 4
          ^
SyntaxError: invalid syntax

This is now fixed, and Vi prompt prefixes - [ins] and [nav] - are skipped just as the normal In would be.

IPython shell can be started in the Vi mode using ipython --TerminalInteractiveShell.editing_mode=vi

Empty History Ranges

A number of magics that take history ranges can now be used with an empty range. These magics are:

• %save
• %load
• %pastebin
• %pycat

Using them this way will make them take the history of the current session up to the point of the magic call (such that the magic itself will not be included).

Therefore it is now possible to save the whole history to a file using simple %save <filename>, load and edit it using %load (makes for a nice usage when followed with :kbd:`F2`), send it to dpaste.org using %pastebin, or view the whole thing syntax-highlighted with a single %pycat.

Traceback improvements

UPDATE THIS IN INPUT.

Previously, error tracebacks for errors happening in code cells were showing a hash, the one used for compiling the Python AST:

In [1]: def foo():
...:     return 3 / 0
...:

In [2]: foo()
---------------------------------------------------------------------------
ZeroDivisionError                         Traceback (most recent call last)
<ipython-input-2-c19b6d9633cf> in <module>
----> 1 foo()

<ipython-input-1-1595a74c32d5> in foo()
    1 def foo():
----> 2     return 3 / 0
    3

ZeroDivisionError: division by zero

The error traceback is now correctly formatted, showing the cell number in which the error happened:

In [1]: def foo():
...:     return 3 / 0
...:

In [2]: foo()
---------------------------------------------------------------------------
ZeroDivisionError                         Traceback (most recent call last)
In [2], in <module>
----> 1 foo()

In [1], in foo()
    1 def foo():
----> 2     return 3 / 0

ZeroDivisionError: division by zero

Remove Deprecated Stuff

We no longer need to add extensions to the PYTHONPATH because that is being handled by load_extension.

We are also removing Cythonmagic, sympyprinting and rmagic as they are now in other packages and no longer need to be inside IPython.

As a reminder, IPython master has diverged from the 7.x branch, thus master may have more feature and API changes.