Added ability to show subclasses when using pinfo and other utilities

When using ?/?? on a class, IPython will now list the first 10 subclasses.

Special Thanks to Chris Mentzel of the Moore Foundation for this feature. Chris is one of the people who played a critical role in IPython/Jupyter getting funding.

We are grateful for all the help Chris has given us over the years, and we're now proud to have code contributed by Chris in IPython.

OSMagics.cd_force_quiet configuration option

You can set this option to force the %cd magic to behave as if -q was passed:

In [1]: cd /
/

In [2]: %config OSMagics.cd_force_quiet = True

In [3]: cd /tmp

In [4]:

See :ghpull:`11491`

In vi editing mode, whether the prompt includes the current vi mode can now be configured

Set the TerminalInteractiveShell.prompt_includes_vi_mode to a boolean value (default: True) to control this feature. See :ghpull:`11492`

Unicode Completion update

In IPython 7.1 the Unicode completion map has been updated and synchronized with the Julia language.

Added and removed character characters:

\jmath (ȷ), \\underleftrightarrow (U+034D, combining) have been added, while \\textasciicaron have been removed

Some sequences have seen their prefix removed:

• 6 characters \text...<tab> should now be inputed with \...<tab> directly,
• 45 characters \Elz...<tab> should now be inputed with \...<tab> directly,
• 65 characters \B...<tab> should now be inputed with \...<tab> directly,
• 450 characters \m...<tab> should now be inputed with \...<tab> directly,

Some sequences have seen their prefix shortened:

• 5 characters \mitBbb...<tab> should now be inputed with \bbi...<tab> directly,
• 52 characters \mit...<tab> should now be inputed with \i...<tab> directly,
• 216 characters \mbfit...<tab> should now be inputed with \bi...<tab> directly,
• 222 characters \mbf...<tab> should now be inputed with \b...<tab> directly,

A couple of characters had their sequence simplified:

• ð, type \dh<tab>, instead of \eth<tab>
• ħ, type \hbar<tab>, instead of \Elzxh<tab>
• ɸ, type \ltphi<tab>, instead of \textphi<tab>
• ϴ, type \varTheta<tab>, instead of \textTheta<tab>
• ℇ, type \eulermascheroni<tab>, instead of \Eulerconst<tab>
• ℎ, type \planck<tab>, instead of \Planckconst<tab>
• U+0336 (COMBINING LONG STROKE OVERLAY), type \strike<tab>, instead of \Elzbar<tab>.

A couple of sequences have been updated:

• \varepsilon now gives ɛ (GREEK SMALL LETTER EPSILON) instead of ε (GREEK LUNATE EPSILON SYMBOL),
• \underbar now gives U+0331 (COMBINING MACRON BELOW) instead of U+0332 (COMBINING LOW LINE).

Prompt Toolkit 2.0

IPython 7.0+ now uses prompt_toolkit 2.0. If you still need to use an earlier prompt_toolkit version, you may need to pin IPython to <7.0.

Autowait: Asynchronous REPL

Staring with IPython 7.0 on Python 3.6+, IPython can automatically await top level code. You should not need to access an event loop or runner yourself. To learn more, read the :ref:`autoawait` section of our docs, see :ghpull:`11265`, or try the following code:

Python 3.6.0
Type 'copyright', 'credits' or 'license' for more information
IPython 7.0.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import aiohttp
   ...: result = aiohttp.get('https://api.github.com')

In [2]: response = await result
<pause for a few 100s ms>

In [3]: await response.json()
Out[3]:
{'authorizations_url': 'https://api.github.com/authorizations',
 'code_search_url': 'https://api.github.com/search/code?q={query}{&page,per_page,sort,order}',
...
}

Integration is by default with asyncio, but other libraries can be configured -- like curio or trio -- to improve concurrency in the REPL:

In [1]: %autoawait trio

In [2]: import trio

In [3]: async def child(i):
   ...:     print("   child %s goes to sleep"%i)
   ...:     await trio.sleep(2)
   ...:     print("   child %s wakes up"%i)

In [4]: print('parent start')
   ...: async with trio.open_nursery() as n:
   ...:     for i in range(3):
   ...:         n.spawn(child, i)
   ...: print('parent end')
parent start
   child 2 goes to sleep
   child 0 goes to sleep
   child 1 goes to sleep
   <about 2 seconds pause>
   child 2 wakes up
   child 1 wakes up
   child 0 wakes up
parent end

See :ref:`autoawait` for more information.

Asynchronous code in a Notebook interface or any other frontend using the Jupyter Protocol will require further updates to the IPykernel package.

Autoreload Improvement

The magic :magic:`%autoreload 2 <autoreload>` now captures new methods added to classes. Earlier, only methods existing as of the initial import were being tracked and updated.

This new feature helps dual environment development - Jupyter+IDE - where the code gradually moves from notebook cells to package files as it gets structured.

Example: An instance of the class MyClass will be able to access the method cube() after it is uncommented and the file file1.py is saved on disk.

# notebook

from mymodule import MyClass
first = MyClass(5)

# mymodule/file1.py

class MyClass:

    def __init__(self, a=10):
        self.a = a

    def square(self):
        print('compute square')
        return self.a*self.a

    # def cube(self):
    #     print('compute cube')
    #     return self.a*self.a*self.a

Misc

The autoindent feature that was deprecated in 5.x was re-enabled and un-deprecated in :ghpull:`11257`

Make :magic:`%run -n -i ... <run>` work correctly. Earlier, if :magic:`%run` was passed both arguments, -n would be silently ignored. See :ghpull:`10308`

The :cellmagic:`%%script` (as well as :cellmagic:`%%bash`, :cellmagic:`%%ruby`... ) cell magics now raise by default if the return code of the given code is non-zero (thus halting execution of further cells in a notebook). The behavior can be disable by passing the --no-raise-error flag.

Deprecations

A couple of unused functions and methods have been deprecated and will be removed in future versions:

• IPython.utils.io.raw_print_err
• IPython.utils.io.raw_print

Backwards incompatible changes

• The API for transforming input before it is parsed as Python code has been completely redesigned: any custom input transformations will need to be rewritten. See :doc:`/config/inputtransforms` for details of the new API.