# -*- coding: utf-8 -*- """IPython Shell classes. All the matplotlib support code was co-developed with John Hunter, matplotlib's author. $Id: Shell.py 1079 2006-01-24 21:52:31Z vivainio $""" #***************************************************************************** # Copyright (C) 2001-2006 Fernando Perez # # Distributed under the terms of the BSD License. The full license is in # the file COPYING, distributed as part of this software. #***************************************************************************** from IPython import Release __author__ = '%s <%s>' % Release.authors['Fernando'] __license__ = Release.license # Code begins import __builtin__ import __main__ import Queue import os import signal import sys import threading import time import IPython from IPython import ultraTB from IPython.genutils import Term,warn,error,flag_calls from IPython.iplib import InteractiveShell from IPython.ipmaker import make_IPython from IPython.Magic import Magic from IPython.ipstruct import Struct # global flag to pass around information about Ctrl-C without exceptions KBINT = False # global flag to turn on/off Tk support. USE_TK = False #----------------------------------------------------------------------------- # This class is trivial now, but I want to have it in to publish a clean # interface. Later when the internals are reorganized, code that uses this # shouldn't have to change. class IPShell: """Create an IPython instance.""" def __init__(self,argv=None,user_ns=None,user_global_ns=None, debug=1,shell_class=InteractiveShell): self.IP = make_IPython(argv,user_ns=user_ns,user_global_ns=user_global_ns, debug=debug,shell_class=shell_class) def mainloop(self,sys_exit=0,banner=None): self.IP.mainloop(banner) if sys_exit: sys.exit() #----------------------------------------------------------------------------- class IPShellEmbed: """Allow embedding an IPython shell into a running program. Instances of this class are callable, with the __call__ method being an alias to the embed() method of an InteractiveShell instance. Usage (see also the example-embed.py file for a running example): ipshell = IPShellEmbed([argv,banner,exit_msg,rc_override]) - argv: list containing valid command-line options for IPython, as they would appear in sys.argv[1:]. For example, the following command-line options: $ ipython -prompt_in1 'Input <\\#>' -colors LightBG would be passed in the argv list as: ['-prompt_in1','Input <\\#>','-colors','LightBG'] - banner: string which gets printed every time the interpreter starts. - exit_msg: string which gets printed every time the interpreter exits. - rc_override: a dict or Struct of configuration options such as those used by IPython. These options are read from your ~/.ipython/ipythonrc file when the Shell object is created. Passing an explicit rc_override dict with any options you want allows you to override those values at creation time without having to modify the file. This way you can create embeddable instances configured in any way you want without editing any global files (thus keeping your interactive IPython configuration unchanged). Then the ipshell instance can be called anywhere inside your code: ipshell(header='') -> Opens up an IPython shell. - header: string printed by the IPython shell upon startup. This can let you know where in your code you are when dropping into the shell. Note that 'banner' gets prepended to all calls, so header is used for location-specific information. For more details, see the __call__ method below. When the IPython shell is exited with Ctrl-D, normal program execution resumes. This functionality was inspired by a posting on comp.lang.python by cmkl on Dec. 06/01 concerning similar uses of pyrepl, and by the IDL stop/continue commands.""" def __init__(self,argv=None,banner='',exit_msg=None,rc_override=None): """Note that argv here is a string, NOT a list.""" self.set_banner(banner) self.set_exit_msg(exit_msg) self.set_dummy_mode(0) # sys.displayhook is a global, we need to save the user's original # Don't rely on __displayhook__, as the user may have changed that. self.sys_displayhook_ori = sys.displayhook # save readline completer status try: #print 'Save completer',sys.ipcompleter # dbg self.sys_ipcompleter_ori = sys.ipcompleter except: pass # not nested with IPython # FIXME. Passing user_ns breaks namespace handling. #self.IP = make_IPython(argv,user_ns=__main__.__dict__) self.IP = make_IPython(argv,rc_override=rc_override,embedded=True) # copy our own displayhook also self.sys_displayhook_embed = sys.displayhook # and leave the system's display hook clean sys.displayhook = self.sys_displayhook_ori # don't use the ipython crash handler so that user exceptions aren't # trapped sys.excepthook = ultraTB.FormattedTB(color_scheme = self.IP.rc.colors, mode = self.IP.rc.xmode, call_pdb = self.IP.rc.pdb) self.restore_system_completer() def restore_system_completer(self): """Restores the readline completer which was in place. This allows embedded IPython within IPython not to disrupt the parent's completion. """ try: self.IP.readline.set_completer(self.sys_ipcompleter_ori) sys.ipcompleter = self.sys_ipcompleter_ori except: pass def __call__(self,header='',local_ns=None,global_ns=None,dummy=None): """Activate the interactive interpreter. __call__(self,header='',local_ns=None,global_ns,dummy=None) -> Start the interpreter shell with the given local and global namespaces, and optionally print a header string at startup. The shell can be globally activated/deactivated using the set/get_dummy_mode methods. This allows you to turn off a shell used for debugging globally. However, *each* time you call the shell you can override the current state of dummy_mode with the optional keyword parameter 'dummy'. For example, if you set dummy mode on with IPShell.set_dummy_mode(1), you can still have a specific call work by making it as IPShell(dummy=0). The optional keyword parameter dummy controls whether the call actually does anything. """ # Allow the dummy parameter to override the global __dummy_mode if dummy or (dummy != 0 and self.__dummy_mode): return # Set global subsystems (display,completions) to our values sys.displayhook = self.sys_displayhook_embed if self.IP.has_readline: self.IP.readline.set_completer(self.IP.Completer.complete) if self.banner and header: format = '%s\n%s\n' else: format = '%s%s\n' banner = format % (self.banner,header) # Call the embedding code with a stack depth of 1 so it can skip over # our call and get the original caller's namespaces. self.IP.embed_mainloop(banner,local_ns,global_ns,stack_depth=1) if self.exit_msg: print self.exit_msg # Restore global systems (display, completion) sys.displayhook = self.sys_displayhook_ori self.restore_system_completer() def set_dummy_mode(self,dummy): """Sets the embeddable shell's dummy mode parameter. set_dummy_mode(dummy): dummy = 0 or 1. This parameter is persistent and makes calls to the embeddable shell silently return without performing any action. This allows you to globally activate or deactivate a shell you're using with a single call. If you need to manually""" if dummy not in [0,1,False,True]: raise ValueError,'dummy parameter must be boolean' self.__dummy_mode = dummy def get_dummy_mode(self): """Return the current value of the dummy mode parameter. """ return self.__dummy_mode def set_banner(self,banner): """Sets the global banner. This banner gets prepended to every header printed when the shell instance is called.""" self.banner = banner def set_exit_msg(self,exit_msg): """Sets the global exit_msg. This exit message gets printed upon exiting every time the embedded shell is called. It is None by default. """ self.exit_msg = exit_msg #----------------------------------------------------------------------------- def sigint_handler (signum,stack_frame): """Sigint handler for threaded apps. This is a horrible hack to pass information about SIGINT _without_ using exceptions, since I haven't been able to properly manage cross-thread exceptions in GTK/WX. In fact, I don't think it can be done (or at least that's my understanding from a c.l.py thread where this was discussed).""" global KBINT print '\nKeyboardInterrupt - Press to continue.', Term.cout.flush() # Set global flag so that runsource can know that Ctrl-C was hit KBINT = True class MTInteractiveShell(InteractiveShell): """Simple multi-threaded shell.""" # Threading strategy taken from: # http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65109, by Brian # McErlean and John Finlay. Modified with corrections by Antoon Pardon, # from the pygtk mailing list, to avoid lockups with system calls. # class attribute to indicate whether the class supports threads or not. # Subclasses with thread support should override this as needed. isthreaded = True def __init__(self,name,usage=None,rc=Struct(opts=None,args=None), user_ns=None,user_global_ns=None,banner2='',**kw): """Similar to the normal InteractiveShell, but with threading control""" InteractiveShell.__init__(self,name,usage,rc,user_ns, user_global_ns,banner2) # Locking control variable. We need to use a norma lock, not an RLock # here. I'm not exactly sure why, it seems to me like it should be # the opposite, but we deadlock with an RLock. Puzzled... self.thread_ready = threading.Condition(threading.Lock()) # A queue to hold the code to be executed. A scalar variable is NOT # enough, because uses like macros cause reentrancy. self.code_queue = Queue.Queue() # Stuff to do at closing time self._kill = False on_kill = kw.get('on_kill') if on_kill is None: on_kill = [] # Check that all things to kill are callable: for t in on_kill: if not callable(t): raise TypeError,'on_kill must be a list of callables' self.on_kill = on_kill def runsource(self, source, filename="", symbol="single"): """Compile and run some source in the interpreter. Modified version of code.py's runsource(), to handle threading issues. See the original for full docstring details.""" global KBINT # If Ctrl-C was typed, we reset the flag and return right away if KBINT: KBINT = False return False try: code = self.compile(source, filename, symbol) except (OverflowError, SyntaxError, ValueError): # Case 1 self.showsyntaxerror(filename) return False if code is None: # Case 2 return True # Case 3 # Store code in queue, so the execution thread can handle it. # Note that with macros and other applications, we MAY re-enter this # section, so we have to acquire the lock with non-blocking semantics, # else we deadlock. got_lock = self.thread_ready.acquire(False) self.code_queue.put(code) if got_lock: self.thread_ready.wait() # Wait until processed in timeout interval self.thread_ready.release() return False def runcode(self): """Execute a code object. Multithreaded wrapper around IPython's runcode().""" # lock thread-protected stuff self.thread_ready.acquire(False) # Install sigint handler try: signal.signal(signal.SIGINT, sigint_handler) except SystemError: # This happens under Windows, which seems to have all sorts # of problems with signal handling. Oh well... pass if self._kill: print >>Term.cout, 'Closing threads...', Term.cout.flush() for tokill in self.on_kill: tokill() print >>Term.cout, 'Done.' # Flush queue of pending code by calling the run methood of the parent # class with all items which may be in the queue. while 1: try: code_to_run = self.code_queue.get_nowait() except Queue.Empty: break self.thread_ready.notify() InteractiveShell.runcode(self,code_to_run) # We're done with thread-protected variables self.thread_ready.release() # This MUST return true for gtk threading to work return True def kill (self): """Kill the thread, returning when it has been shut down.""" self.thread_ready.acquire(False) self._kill = True self.thread_ready.release() class MatplotlibShellBase: """Mixin class to provide the necessary modifications to regular IPython shell classes for matplotlib support. Given Python's MRO, this should be used as the FIRST class in the inheritance hierarchy, so that it overrides the relevant methods.""" def _matplotlib_config(self,name): """Return items needed to setup the user's shell with matplotlib""" # Initialize matplotlib to interactive mode always import matplotlib from matplotlib import backends matplotlib.interactive(True) def use(arg): """IPython wrapper for matplotlib's backend switcher. In interactive use, we can not allow switching to a different interactive backend, since thread conflicts will most likely crash the python interpreter. This routine does a safety check first, and refuses to perform a dangerous switch. It still allows switching to non-interactive backends.""" if arg in backends.interactive_bk and arg != self.mpl_backend: m=('invalid matplotlib backend switch.\n' 'This script attempted to switch to the interactive ' 'backend: `%s`\n' 'Your current choice of interactive backend is: `%s`\n\n' 'Switching interactive matplotlib backends at runtime\n' 'would crash the python interpreter, ' 'and IPython has blocked it.\n\n' 'You need to either change your choice of matplotlib backend\n' 'by editing your .matplotlibrc file, or run this script as a \n' 'standalone file from the command line, not using IPython.\n' % (arg,self.mpl_backend) ) raise RuntimeError, m else: self.mpl_use(arg) self.mpl_use._called = True self.matplotlib = matplotlib self.mpl_backend = matplotlib.rcParams['backend'] # we also need to block switching of interactive backends by use() self.mpl_use = matplotlib.use self.mpl_use._called = False # overwrite the original matplotlib.use with our wrapper matplotlib.use = use # This must be imported last in the matplotlib series, after # backend/interactivity choices have been made try: import matplotlib.pylab as pylab self.pylab = pylab self.pylab_name = 'pylab' except ImportError: import matplotlib.matlab as matlab self.pylab = matlab self.pylab_name = 'matlab' self.pylab.show._needmain = False # We need to detect at runtime whether show() is called by the user. # For this, we wrap it into a decorator which adds a 'called' flag. self.pylab.draw_if_interactive = flag_calls(self.pylab.draw_if_interactive) # Build a user namespace initialized with matplotlib/matlab features. user_ns = {'__name__':'__main__', '__builtins__' : __builtin__ } # Be careful not to remove the final \n in the code string below, or # things will break badly with py22 (I think it's a python bug, 2.3 is # OK). pname = self.pylab_name # Python can't interpolate dotted var names exec ("import matplotlib\n" "import matplotlib.%(pname)s as %(pname)s\n" "from matplotlib.%(pname)s import *\n" % locals()) in user_ns # Build matplotlib info banner b=""" Welcome to pylab, a matplotlib-based Python environment. For more information, type 'help(pylab)'. """ return user_ns,b def mplot_exec(self,fname,*where,**kw): """Execute a matplotlib script. This is a call to execfile(), but wrapped in safeties to properly handle interactive rendering and backend switching.""" #print '*** Matplotlib runner ***' # dbg # turn off rendering until end of script isInteractive = self.matplotlib.rcParams['interactive'] self.matplotlib.interactive(False) self.safe_execfile(fname,*where,**kw) self.matplotlib.interactive(isInteractive) # make rendering call now, if the user tried to do it if self.pylab.draw_if_interactive.called: self.pylab.draw() self.pylab.draw_if_interactive.called = False # if a backend switch was performed, reverse it now if self.mpl_use._called: self.matplotlib.rcParams['backend'] = self.mpl_backend def magic_run(self,parameter_s=''): Magic.magic_run(self,parameter_s,runner=self.mplot_exec) # Fix the docstring so users see the original as well magic_run.__doc__ = "%s\n%s" % (Magic.magic_run.__doc__, "\n *** Modified %run for Matplotlib," " with proper interactive handling ***") # Now we provide 2 versions of a matplotlib-aware IPython base shells, single # and multithreaded. Note that these are meant for internal use, the IPShell* # classes below are the ones meant for public consumption. class MatplotlibShell(MatplotlibShellBase,InteractiveShell): """Single-threaded shell with matplotlib support.""" def __init__(self,name,usage=None,rc=Struct(opts=None,args=None), user_ns=None,user_global_ns=None,**kw): user_ns,b2 = self._matplotlib_config(name) InteractiveShell.__init__(self,name,usage,rc,user_ns,user_global_ns, banner2=b2,**kw) class MatplotlibMTShell(MatplotlibShellBase,MTInteractiveShell): """Multi-threaded shell with matplotlib support.""" def __init__(self,name,usage=None,rc=Struct(opts=None,args=None), user_ns=None,user_global_ns=None, **kw): user_ns,b2 = self._matplotlib_config(name) MTInteractiveShell.__init__(self,name,usage,rc,user_ns,user_global_ns, banner2=b2,**kw) #----------------------------------------------------------------------------- # Utility functions for the different GUI enabled IPShell* classes. def get_tk(): """Tries to import Tkinter and returns a withdrawn Tkinter root window. If Tkinter is already imported or not available, this returns None. This function calls `hijack_tk` underneath. """ if not USE_TK or sys.modules.has_key('Tkinter'): return None else: try: import Tkinter except ImportError: return None else: hijack_tk() r = Tkinter.Tk() r.withdraw() return r def hijack_tk(): """Modifies Tkinter's mainloop with a dummy so when a module calls mainloop, it does not block. """ def misc_mainloop(self, n=0): pass def tkinter_mainloop(n=0): pass import Tkinter Tkinter.Misc.mainloop = misc_mainloop Tkinter.mainloop = tkinter_mainloop def update_tk(tk): """Updates the Tkinter event loop. This is typically called from the respective WX or GTK mainloops. """ if tk: tk.update() def hijack_wx(): """Modifies wxPython's MainLoop with a dummy so user code does not block IPython. The hijacked mainloop function is returned. """ def dummy_mainloop(*args, **kw): pass import wxPython ver = wxPython.__version__ orig_mainloop = None if ver[:3] >= '2.5': import wx if hasattr(wx, '_core_'): core = getattr(wx, '_core_') elif hasattr(wx, '_core'): core = getattr(wx, '_core') else: raise AttributeError('Could not find wx core module') orig_mainloop = core.PyApp_MainLoop core.PyApp_MainLoop = dummy_mainloop elif ver[:3] == '2.4': orig_mainloop = wxPython.wxc.wxPyApp_MainLoop wxPython.wxc.wxPyApp_MainLoop = dummy_mainloop else: warn("Unable to find either wxPython version 2.4 or >= 2.5.") return orig_mainloop def hijack_gtk(): """Modifies pyGTK's mainloop with a dummy so user code does not block IPython. This function returns the original `gtk.mainloop` function that has been hijacked. """ def dummy_mainloop(*args, **kw): pass import gtk if gtk.pygtk_version >= (2,4,0): orig_mainloop = gtk.main else: orig_mainloop = gtk.mainloop gtk.mainloop = dummy_mainloop gtk.main = dummy_mainloop return orig_mainloop #----------------------------------------------------------------------------- # The IPShell* classes below are the ones meant to be run by external code as # IPython instances. Note that unless a specific threading strategy is # desired, the factory function start() below should be used instead (it # selects the proper threaded class). class IPShellGTK(threading.Thread): """Run a gtk mainloop() in a separate thread. Python commands can be passed to the thread where they will be executed. This is implemented by periodically checking for passed code using a GTK timeout callback.""" TIMEOUT = 100 # Millisecond interval between timeouts. def __init__(self,argv=None,user_ns=None,user_global_ns=None, debug=1,shell_class=MTInteractiveShell): import gtk self.gtk = gtk self.gtk_mainloop = hijack_gtk() # Allows us to use both Tk and GTK. self.tk = get_tk() if gtk.pygtk_version >= (2,4,0): mainquit = self.gtk.main_quit else: mainquit = self.gtk.mainquit self.IP = make_IPython(argv,user_ns=user_ns, user_global_ns=user_global_ns, debug=debug, shell_class=shell_class, on_kill=[mainquit]) # HACK: slot for banner in self; it will be passed to the mainloop # method only and .run() needs it. The actual value will be set by # .mainloop(). self._banner = None threading.Thread.__init__(self) def run(self): self.IP.mainloop(self._banner) self.IP.kill() def mainloop(self,sys_exit=0,banner=None): self._banner = banner if self.gtk.pygtk_version >= (2,4,0): import gobject gobject.idle_add(self.on_timer) else: self.gtk.idle_add(self.on_timer) if sys.platform != 'win32': try: if self.gtk.gtk_version[0] >= 2: self.gtk.threads_init() except AttributeError: pass except RuntimeError: error('Your pyGTK likely has not been compiled with ' 'threading support.\n' 'The exception printout is below.\n' 'You can either rebuild pyGTK with threads, or ' 'try using \n' 'matplotlib with a different backend (like Tk or WX).\n' 'Note that matplotlib will most likely not work in its ' 'current state!') self.IP.InteractiveTB() self.start() self.gtk.threads_enter() self.gtk_mainloop() self.gtk.threads_leave() self.join() def on_timer(self): """Called when GTK is idle. Must return True always, otherwise GTK stops calling it""" update_tk(self.tk) self.IP.runcode() time.sleep(0.01) return True class IPShellWX(threading.Thread): """Run a wx mainloop() in a separate thread. Python commands can be passed to the thread where they will be executed. This is implemented by periodically checking for passed code using a GTK timeout callback.""" TIMEOUT = 100 # Millisecond interval between timeouts. def __init__(self,argv=None,user_ns=None,user_global_ns=None, debug=1,shell_class=MTInteractiveShell): self.IP = make_IPython(argv,user_ns=user_ns, user_global_ns=user_global_ns, debug=debug, shell_class=shell_class, on_kill=[self.wxexit]) wantedwxversion=self.IP.rc.wxversion if wantedwxversion!="0": try: import wxversion except ImportError: error('The wxversion module is needed for WX version selection') else: try: wxversion.select(wantedwxversion) except: self.IP.InteractiveTB() error('Requested wxPython version %s could not be loaded' % wantedwxversion) import wxPython.wx as wx threading.Thread.__init__(self) self.wx = wx self.wx_mainloop = hijack_wx() # Allows us to use both Tk and GTK. self.tk = get_tk() # HACK: slot for banner in self; it will be passed to the mainloop # method only and .run() needs it. The actual value will be set by # .mainloop(). self._banner = None self.app = None def wxexit(self, *args): if self.app is not None: self.app.agent.timer.Stop() self.app.ExitMainLoop() def run(self): self.IP.mainloop(self._banner) self.IP.kill() def mainloop(self,sys_exit=0,banner=None): self._banner = banner self.start() class TimerAgent(self.wx.wxMiniFrame): wx = self.wx IP = self.IP tk = self.tk def __init__(self, parent, interval): style = self.wx.wxDEFAULT_FRAME_STYLE | self.wx.wxTINY_CAPTION_HORIZ self.wx.wxMiniFrame.__init__(self, parent, -1, ' ', pos=(200, 200), size=(100, 100),style=style) self.Show(False) self.interval = interval self.timerId = self.wx.wxNewId() def StartWork(self): self.timer = self.wx.wxTimer(self, self.timerId) self.wx.EVT_TIMER(self, self.timerId, self.OnTimer) self.timer.Start(self.interval) def OnTimer(self, event): update_tk(self.tk) self.IP.runcode() class App(self.wx.wxApp): wx = self.wx TIMEOUT = self.TIMEOUT def OnInit(self): 'Create the main window and insert the custom frame' self.agent = TimerAgent(None, self.TIMEOUT) self.agent.Show(self.wx.false) self.agent.StartWork() return self.wx.true self.app = App(redirect=False) self.wx_mainloop(self.app) self.join() class IPShellQt(threading.Thread): """Run a Qt event loop in a separate thread. Python commands can be passed to the thread where they will be executed. This is implemented by periodically checking for passed code using a Qt timer / slot.""" TIMEOUT = 100 # Millisecond interval between timeouts. def __init__(self,argv=None,user_ns=None,user_global_ns=None, debug=0,shell_class=MTInteractiveShell): import qt class newQApplication: def __init__( self ): self.QApplication = qt.QApplication def __call__( *args, **kwargs ): return qt.qApp def exec_loop( *args, **kwargs ): pass def __getattr__( self, name ): return getattr( self.QApplication, name ) qt.QApplication = newQApplication() # Allows us to use both Tk and QT. self.tk = get_tk() self.IP = make_IPython(argv,user_ns=user_ns, user_global_ns=user_global_ns, debug=debug, shell_class=shell_class, on_kill=[qt.qApp.exit]) # HACK: slot for banner in self; it will be passed to the mainloop # method only and .run() needs it. The actual value will be set by # .mainloop(). self._banner = None threading.Thread.__init__(self) def run(self): self.IP.mainloop(self._banner) self.IP.kill() def mainloop(self,sys_exit=0,banner=None): import qt self._banner = banner if qt.QApplication.startingUp(): a = qt.QApplication.QApplication(sys.argv) self.timer = qt.QTimer() qt.QObject.connect( self.timer, qt.SIGNAL( 'timeout()' ), self.on_timer ) self.start() self.timer.start( self.TIMEOUT, True ) while True: if self.IP._kill: break qt.qApp.exec_loop() self.join() def on_timer(self): update_tk(self.tk) result = self.IP.runcode() self.timer.start( self.TIMEOUT, True ) return result # A set of matplotlib public IPython shell classes, for single-threaded # (Tk* and FLTK* backends) and multithreaded (GTK* and WX* backends) use. class IPShellMatplotlib(IPShell): """Subclass IPShell with MatplotlibShell as the internal shell. Single-threaded class, meant for the Tk* and FLTK* backends. Having this on a separate class simplifies the external driver code.""" def __init__(self,argv=None,user_ns=None,user_global_ns=None,debug=1): IPShell.__init__(self,argv,user_ns,user_global_ns,debug, shell_class=MatplotlibShell) class IPShellMatplotlibGTK(IPShellGTK): """Subclass IPShellGTK with MatplotlibMTShell as the internal shell. Multi-threaded class, meant for the GTK* backends.""" def __init__(self,argv=None,user_ns=None,user_global_ns=None,debug=1): IPShellGTK.__init__(self,argv,user_ns,user_global_ns,debug, shell_class=MatplotlibMTShell) class IPShellMatplotlibWX(IPShellWX): """Subclass IPShellWX with MatplotlibMTShell as the internal shell. Multi-threaded class, meant for the WX* backends.""" def __init__(self,argv=None,user_ns=None,user_global_ns=None,debug=1): IPShellWX.__init__(self,argv,user_ns,user_global_ns,debug, shell_class=MatplotlibMTShell) class IPShellMatplotlibQt(IPShellQt): """Subclass IPShellQt with MatplotlibMTShell as the internal shell. Multi-threaded class, meant for the Qt* backends.""" def __init__(self,argv=None,user_ns=None,user_global_ns=None,debug=1): IPShellQt.__init__(self,argv,user_ns,user_global_ns,debug, shell_class=MatplotlibMTShell) #----------------------------------------------------------------------------- # Factory functions to actually start the proper thread-aware shell def _matplotlib_shell_class(): """Factory function to handle shell class selection for matplotlib. The proper shell class to use depends on the matplotlib backend, since each backend requires a different threading strategy.""" try: import matplotlib except ImportError: error('matplotlib could NOT be imported! Starting normal IPython.') sh_class = IPShell else: backend = matplotlib.rcParams['backend'] if backend.startswith('GTK'): sh_class = IPShellMatplotlibGTK elif backend.startswith('WX'): sh_class = IPShellMatplotlibWX elif backend.startswith('Qt'): sh_class = IPShellMatplotlibQt else: sh_class = IPShellMatplotlib #print 'Using %s with the %s backend.' % (sh_class,backend) # dbg return sh_class # This is the one which should be called by external code. def start(user_ns = None): """Return a running shell instance, dealing with threading options. This is a factory function which will instantiate the proper IPython shell based on the user's threading choice. Such a selector is needed because different GUI toolkits require different thread handling details.""" global USE_TK # Crude sys.argv hack to extract the threading options. argv = sys.argv if len(argv) > 1: if len(argv) > 2: arg2 = argv[2] if arg2.endswith('-tk'): USE_TK = True arg1 = argv[1] if arg1.endswith('-gthread'): shell = IPShellGTK elif arg1.endswith( '-qthread' ): shell = IPShellQt elif arg1.endswith('-wthread'): shell = IPShellWX elif arg1.endswith('-pylab'): shell = _matplotlib_shell_class() else: shell = IPShell else: shell = IPShell return shell(user_ns = user_ns) # Some aliases for backwards compatibility IPythonShell = IPShell IPythonShellEmbed = IPShellEmbed #************************ End of file ***************************