logstart -o ???

How can you turn on output logging (logstart -o) from within a
session after logging has already started?

  In [40]: %logstart -o
  WARNING: Couldn't start log: Log file is already active: ipython_log.py

Question re Subtle Diff between Embed and Breakpoint

Hi, I'm preparing a presentation on the features of IPython and I'm stuck on 
one question.

What is the difference (in capability) between:

   dropping into an IPShellEmbed(), poking some vars and then
   exiting the shell to let the program continue executing,

   setting a breakpoint using pdb at that same point, poking
   some vars and letting it continue running,

   enabling IPython's feature of sending uncaught exceptions
   into the debugger, placing an exception at that same code
   point, and upon hitting the exception, poking at some vars,
   I guess in this cast I cannot continue running though since
   Python exceptions are not recoverable.

There seems to be a very subtle difference and I want to convey it accurately 
in my presentation (actually a screencast).

Thanks,

-Jeff

Various questions re: IPython on Windows

I'm having a few problems and I don't know if these are bugs, or simply
user error.  Any help would be appreciated.  :)

1.  When I try to run the %edit command, I always get the below error. 
The error occurs *before* my editor has even launched!

Editing... done. Executing edited code...
Could not open file
<c:\docume~1\rsiebler\locals~1\temp\ipython_edit_zo5me2.py>
for safe execution.
WARNING: File not found. Did you forget to save?

2.  When I try to use the %run command on a script, I always get this error:

In [3]: %run save_song_list.py
---------------------------------------------------------------------------
exceptions.SystemExit                                Traceback (most
recent call
 last)

c:\temp\save_song_list.py
     83     db.close()
     84
---> 85 if __name__== '__main__': main()
     86
     87

c:\temp\save_song_list.py in main()
     50         last_song = db['last_song']
     51         if song in last_song:

Re: Various questions re: IPython on Windows

On 7/13/07, Robin Siebler <robinsiebler <at> 321.net> wrote:

> 1.  When I try to run the %edit command, I always get the below error.
> The error occurs *before* my editor has even launched!

What's in your EDITOR variable?

> 2.  When I try to use the %run command on a script, I always get this error:
>
> In [3]: %run save_song_list.py
> ---------------------------------------------------------------------------
> exceptions.SystemExit                                Traceback (most
> recent call
>  last)
>
> c:\temp\save_song_list.py
>      83     db.close()
>      84
> ---> 85 if __name__== '__main__': main()
>      86
>      87
>
> c:\temp\save_song_list.py in main()
>      50         last_song = db['last_song']
>      51         if song in last_song:
> ---> 52             sys.exit()
>      53         else:
>      54             if len(last_song) == 3:
>
> SystemExit:

Re: UNSUBSCRIBE

On 7/20/07, Howey, David A <d.howey <at> imperial.ac.uk> wrote:
>
>
>
> please unsubscribe me

Please unsubscribe yourself:

http://projects.scipy.org//mailman/listinfo/ipython-user

Thanks

f

Re: Various questions re: IPython on Windows

> What's in your EDITOR variable?
I don't have one.  It is launching notepad (well Notepad++ really)

> Well, you do run sys.exit()...
>
>> AttributeError: 'module' object has no attribute 'clear_history'
>
> Do you have the latest pyreadline installed?
pyreadline-1.4.4.win32.exe

>
>>
>> 3.  For pysh, if I try to use $var=cmd or $$var=cmd as shown in the docs,
>> I get the following error:
>>
>> [Documents and Settings\rsiebler]|15> $foo = !dir
>
> It should be "foo = !dir", i.e. lose the $.

Ok.  I guess the docs are Linuxcentric. :p

Re: Various questions re: IPython on Windows

On 7/20/07, Robin Siebler <robinsiebler <at> 321.net> wrote:
> > What's in your EDITOR variable?
> I don't have one.  It is launching notepad (well Notepad++ really)
>
> > Well, you do run sys.exit()...
> >
> >> AttributeError: 'module' object has no attribute 'clear_history'
> >
> > Do you have the latest pyreadline installed?
> pyreadline-1.4.4.win32.exe
>
> >
> >>
> >> 3.  For pysh, if I try to use $var=cmd or $$var=cmd as shown in the docs,
> >> I get the following error:
> >>
> >> [Documents and Settings\rsiebler]|15> $foo = !dir
> >
> > It should be "foo = !dir", i.e. lose the $.
>
> Ok.  I guess the docs are Linuxcentric. :p

No, it's just that the $foo syntax is only activated in the 'pysh' old
profile, not in the newer 'sh' one:

IPython profile: pysh
fperez <at> planck[misc]|1> $foo = ls
fperez <at> planck[misc]|2> foo
                   <2> LSString (.p, .n, .l, .s available). Value:
addtest.txt

Re: Various questions re: IPython on Windows

> > What's in your EDITOR variable?
> I don't have one.  It is launching notepad (well Notepad++ really)

There is something different about the way Notepad++ (and cream for
gvim and some other editors I've tried) starts compared to plain old
Notepad that makes ipy think the editor has already returned control.
If you change the editor variable back to Notepad the %ed command will
work. A substandard solution, I know, but the only one I've learned
about so far.

If cygwin is on the computer one can also use command line vi.exe
which is at least smarter than notepad if not as convenient for those
of us with a Windows background.

cheers,
--

-- 
-matt

problem with Ipython1 SAW and test library "py.test"

    # Make it easy to import extensions - they are always directly on pythonpath.
    # Therefore, non-IPython modules can be added to Extensions directory
    import os
    sys.path.append(os.path.dirname(__file__) + "/Extensions")

    # Define what gets imported with a 'from IPython import *'
    __all__ = ['deep_reload','genutils','ipstruct','ultraTB','DPyGetOpt',
               'Itpl','hooks','ConfigLoader','OutputTrap','Release','Shell',
               'platutils','platutils_win32','platutils_posix','platutils_dummy',
               'ipapi','rlineimpl', 'strdispatch']

    # Load __all__ in IPython namespace so that a simple 'import IPython' gives
    # access to them via IPython.<name>
    glob,loc = globals(),locals()
    for name in __all__:
>       __import__(name,glob,loc,[])

[/usr/lib/python2.5/site-packages/IPython/__init__.py:60]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    $Id: genutils.py 2190 2007-03-30 18:35:46Z fperez $"""

    #*****************************************************************************
    #       Copyright (C) 2001-2006 Fernando Perez. <fperez <at> colorado.edu>
    #
    #  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

    #****************************************************************************
    # required modules from the Python standard library
    import __main__
    import commands
    import os
    import re
    import shlex
    import shutil
    import sys
    import tempfile
    import time
    import types
    import warnings

    # Other IPython utilities
    from IPython.Itpl import Itpl,itpl,printpl
    from IPython import DPyGetOpt
    from path import path
    if os.name == "nt":
        from IPython.winconsole import get_console_size

    #****************************************************************************
    # Exceptions
    class Error(Exception):
        """Base class for exceptions in this module."""
        pass

    #----------------------------------------------------------------------------
    class IOStream:
        def __init__(self,stream,fallback):
            if not hasattr(stream,'write') or not hasattr(stream,'flush'):
                stream = fallback
            self.stream = stream
            self._swrite = stream.write
            self.flush = stream.flush

        def write(self,data):
            try:
                self._swrite(data)
            except:
                try:
                    # print handles some unicode issues which may trip a plain
                    # write() call.  Attempt to emulate write() by using a
                    # trailing comma
                    print >> self.stream, data,
                except:
                    # if we get here, something is seriously broken.
                    print >> sys.stderr, \
                          'ERROR - failed to write data to stream:', self.stream

        def close(self):
            pass


    class IOTerm:
        """ Term holds the file or file-like objects for handling I/O operations.

        These are normally just sys.stdin, sys.stdout and sys.stderr but for
        Windows they can can replaced to allow editing the strings before they are
        displayed."""

        # In the future, having IPython channel all its I/O operations through
        # this class will make it easier to embed it into other environments which
        # are not a normal terminal (such as a GUI-based shell)
        def __init__(self,cin=None,cout=None,cerr=None):
            self.cin  = IOStream(cin,sys.stdin)
            self.cout = IOStream(cout,sys.stdout)
            self.cerr = IOStream(cerr,sys.stderr)

    # Global variable to be used for all I/O
>   Term = IOTerm()

[/usr/lib/python2.5/site-packages/IPython/genutils.py:91]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    def __init__(self,cin=None,cout=None,cerr=None):
>       self.cin  = IOStream(cin,sys.stdin)

[/usr/lib/python2.5/site-packages/IPython/genutils.py:86]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    def __init__(self,stream,fallback):
        if not hasattr(stream,'write') or not hasattr(stream,'flush'):
            stream = fallback
        self.stream = stream
E       self._swrite = stream.write
>       AttributeError: DontReadFromInput instance has no attribute 'write'

[/usr/lib/python2.5/site-packages/IPython/genutils.py:54]
________________________________________________________________________________________
======================= tests finished: 1 failed in 0.05 seconds =======================
[root <at> localhost python]# clear
[root <at> localhost python]# py.test
================================= test process starts ==================================
executable:   /usr/bin/python2.5  (2.5.0-final-0)
using py lib: /usr/lib/python2.5/site-packages/py <rev unknown>

test_WS_SessionManager.py - FAILED TO LOAD MODULE

________________________________________________________________________________________
_____________________________________ entrypoint:  _____________________________________

    def runtraced(self, colitem):
        if self.shouldclose():
            raise Exit, "received external close signal"

        outcome = None
        colitem.startcapture()
        try:
            self.start(colitem)
            try:
                try:
                    if colitem._stickyfailure:
                        raise colitem._stickyfailure
>                   outcome = self.run(colitem)

[/usr/lib/python2.5/site-packages/py/test/session.py:83]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    def run(self, colitem):
        if self.config.option.collectonly and isinstance(colitem, py.test.collect.Item):
            return
        if isinstance(colitem, py.test.collect.Item):
            colitem._skipbykeyword(self.config.option.keyword)
>       res = colitem.run()

[/usr/lib/python2.5/site-packages/py/test/session.py:106]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    def run(self):
>       if getattr(self.obj, 'disabled', 0):

[/usr/lib/python2.5/site-packages/py/test/collect.py:351]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    def obj(self):
        try:
            return self._obj
        except AttributeError:
            failure = getattr(self, '_stickyfailure', None)
            if failure is not None:
                raise failure[0], failure[1], failure[2]
            try:
>               self._obj = obj = self.fspath.pyimport()

[/usr/lib/python2.5/site-packages/py/test/collect.py:380]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    def pyimport(self, modname=None, ensuresyspath=True):
        """ return path as an imported python module.
                if modname is None, look for the containing package
                and construct an according module name.
                The module will be put/looked up in sys.modules.
            """
        if not self.check():
            raise py.error.ENOENT(self)
        #print "trying to import", self
        pkgpath = None
        if modname is None:
            #try:
            #    return self._module
            #except AttributeError:
            #    pass
            pkgpath = self.pypkgpath()
            if pkgpath is not None:
                if ensuresyspath:
                    self._prependsyspath(pkgpath.dirpath())
                pkg = __import__(pkgpath.basename, None, None, [])

                if hasattr(pkg, '__package__'):
                    modname = pkg.__package__.getimportname(self)
                    assert modname is not None, "package %s doesn't know %s" % (
                                                pkg.__name__, self)

                else:
                    names = self.new(ext='').relto(pkgpath.dirpath())
                    names = names.split(self.sep)
                    modname = ".".join(names)
            else:
                # no package scope, still make it possible
                if ensuresyspath:
                    self._prependsyspath(self.dirpath())
                modname = self.purebasename
E           mod = __import__(modname, None, None, ['__doc__'])
>             File "/usr/share/python/test_WS_SessionManager.py", line 3
                import ipythomport ipython1.kernel.api as kernel
                                           ^
            SyntaxError: invalid syntax

[/usr/lib/python2.5/site-packages/py/path/local/local.py:418]
________________________________________________________________________________________
======================= tests finished: 1 failed in 0.03 seconds =======================
[root <at> localhost python]#

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IPython-user <at> scipy.org
http://lists.ipython.scipy.org/mailman/listinfo/ipython-user

New showmedo videos by Jeff Rush

Hi everyone,

Jeff Rush, the Python foundation advocacy lead, has just finished a
new series of ShowMeDo videos about ipython:

http://showmedo.com/videos/series?name=CnluURUTV

I have to admit that I (re)learned a few tricks watching it :)

I'd like to thank Jeff for the great work as well as Ian for ShowMeDo.
 And Ian has mentioned that there's a lot of interest in IPython
videos, so if any of you has a bit of time, this would be a great
little project with a guaranteed audience.

Here's more info about the process:

http://ipython.scipy.org/moin/ShowMeDo

feel free to edit that page with new ideas of a topic you'd either
want to see covered or would like to cover yourself (related to
ipython, I'm not trying to hijack the showmedo system :)

Cheers,

f