upstream/ipython Files · IPython/deathrow/ipy_profile_scipy.py

Backport PR : inputhook_qt4: Use QEventLoop instead of starting up the QCoreApplication...

Backport PR : inputhook_qt4: Use QEventLoop instead of starting up the QCoreApplication I referenced this branch in and was letting it sit for a little while, but I have decided to make it a full pull request to get some additional visibility. Essentially our Qt event loop mechanism repeatedly starts and quits a `QCoreApplication` object. Unfortunately the `QCoreApplication::quit` slot has a lot of unintended side effects (like emitting an `aboutToQuit` signal which closes all open file dialogs). For our input hook, we _might_ be able to get by with just using a `QEventLoop` whose quit slot is much simpler and less destructive. For a little bit of background on why one might want to just use `QEventLoop::exec`, let's examine what `QCoreApplication::exec` does: ```c++ int QCoreApplication::exec() { if (!QCoreApplicationPrivate::checkInstance("exec")) return -1; // ... [some assertions] threadData->quitNow = false; QEventLoop eventLoop; self->d_func()->in_exec = true; self->d_func()->aboutToQuitEmitted = false; int returnCode = eventLoop.exec(); threadData->quitNow = false; if (self) { self->d_func()->in_exec = false; if (!self->d_func()->aboutToQuitEmitted) emit self->aboutToQuit(); self->d_func()->aboutToQuitEmitted = true; sendPostedEvents(0, QEvent::DeferredDelete); } return returnCode; } ``` As far as I can tell, it's a small wrapper around `QEventLoop::exec` which also: * Sets some variables regarding the current status * Emits an `aboutToQuit` signal right before the function returns (which is the root cause of @denisri's problem in ). Historically, our Qt event loop is a python implementation of the (win 32) input hook supplied with the PyQt4 source (see qtcore_input_hook` in `python-qt4/sip/QtCore/qcoreapplication.sip`), which more or less dates to a [mailing list post](http://www.riverbankcomputing.com/pipermail/pyqt/2007-July/016512.html) from July 2007.

Brian Granger - - Load All Authors

File last commit:

r2267:928c921b


                r9834:71196839

Download file

             ipy_profile_scipy.py
        
                    29 lines
            
             | 681 B
            
                | text/x-python
            
             |
                PythonLexer
            
             / IPython / deathrow / ipy_profile_scipy.py
          
                    History
                
                 |
                  Source
                 | Raw
                 |Copy content
                 |Copy permalink

        Fernando Perez
    
Add numpy profile and update scipy one to conform to np/sp conventions.

              r1227
            
      """ IPython 'scipy' profile, preloads NumPy and SciPy.

        vivainio
    
crlf cleanup

              r680
            
        Fernando Perez
    
Add numpy profile and update scipy one to conform to np/sp conventions.

              r1227
            
      This profile loads the math/cmath modules as well as all of numpy and scipy.

        vivainio
    
crlf cleanup

              r680
            
        Fernando Perez
    
Add numpy profile and update scipy one to conform to np/sp conventions.

              r1227
            
      It exposes numpy and scipy via the 'np' and 'sp' shorthands as well for

      convenience.

        vivainio
    
crlf cleanup

              r680
            
      """

        Brian Granger
    
ipapi.py => core/ipapi.py and imports updated.

              r2027
            
      from IPython.core import ipapi

        vivainio
    
crlf cleanup

              r680
            
      import ipy_defaults

      def main():

        Brian Granger
    
ipapi.py => core/ipapi.py and imports updated.

              r2027
            
          ip = ipapi.get()

        vivainio
    
crlf cleanup

              r680
            
          try:

        Fernando Perez
    
Add numpy profile and update scipy one to conform to np/sp conventions.

              r1227
            
              ip.ex("import math,cmath")

        vivainio
    
crlf cleanup

              r680
            
              ip.ex("import numpy")

        fperez
    
- new doctest_mode magic to toggle doctest pasting/prompts....

              r763
            
              ip.ex("import scipy")

        Fernando Perez
    
Add numpy profile and update scipy one to conform to np/sp conventions.

              r1227
            
              ip.ex("import numpy as np")

              ip.ex("import scipy as sp")

        vivainio
    
crlf cleanup

              r680
            
              ip.ex("from numpy import *")

        fperez
    
- new doctest_mode magic to toggle doctest pasting/prompts....

              r763
            
              ip.ex("from scipy import *")

        Fernando Perez
    
Add numpy profile and update scipy one to conform to np/sp conventions.

              r1227
            
        vivainio
    
crlf cleanup

              r680
            
          except ImportError:

        Fernando Perez
    
Add numpy profile and update scipy one to conform to np/sp conventions.

              r1227
            
              print "Unable to start scipy profile, are numpy and scipy installed?"

        vivainio
    
crlf cleanup

              r680
            
        fperez
    
- new doctest_mode magic to toggle doctest pasting/prompts....

              r763
            
      main()

	Site-wide shortcuts
/	Use quick search box
g h	Goto home page
g g	Goto my private gists page
g G	Goto my public gists page
g 0-9	Goto bookmarked items from 0-9
n r	New repository page
n g	New gist page

	Repositories
g s	Goto summary page
g c	Goto changelog page
g f	Goto files page
g F	Goto files page with file search activated
g p	Goto pull requests page
g o	Goto repository settings
g O	Goto repository access permissions settings
t s	Toggle sidebar on some pages

Fernando Perez Add numpy profile and update scipy one to conform to np/sp conventions.	r1227	""" IPython 'scipy' profile, preloads NumPy and SciPy.
vivainio crlf cleanup	r680
Fernando Perez Add numpy profile and update scipy one to conform to np/sp conventions.	r1227	This profile loads the math/cmath modules as well as all of numpy and scipy.
vivainio crlf cleanup	r680
Fernando Perez Add numpy profile and update scipy one to conform to np/sp conventions.	r1227	It exposes numpy and scipy via the 'np' and 'sp' shorthands as well for
		convenience.
vivainio crlf cleanup	r680	"""

Brian Granger ipapi.py => core/ipapi.py and imports updated.	r2027	from IPython.core import ipapi
vivainio crlf cleanup	r680	import ipy_defaults

		def main():
Brian Granger ipapi.py => core/ipapi.py and imports updated.	r2027	ip = ipapi.get()
vivainio crlf cleanup	r680
		try:
Fernando Perez Add numpy profile and update scipy one to conform to np/sp conventions.	r1227	ip.ex("import math,cmath")
vivainio crlf cleanup	r680	ip.ex("import numpy")
fperez - new doctest_mode magic to toggle doctest pasting/prompts....	r763	ip.ex("import scipy")
Fernando Perez Add numpy profile and update scipy one to conform to np/sp conventions.	r1227
		ip.ex("import numpy as np")
		ip.ex("import scipy as sp")

vivainio crlf cleanup	r680	ip.ex("from numpy import *")
fperez - new doctest_mode magic to toggle doctest pasting/prompts....	r763	ip.ex("from scipy import *")
Fernando Perez Add numpy profile and update scipy one to conform to np/sp conventions.	r1227
vivainio crlf cleanup	r680	except ImportError:
Fernando Perez Add numpy profile and update scipy one to conform to np/sp conventions.	r1227	print "Unable to start scipy profile, are numpy and scipy installed?"
vivainio crlf cleanup	r680
fperez - new doctest_mode magic to toggle doctest pasting/prompts....	r763	main()