Torben at 20:21, 30 October 2024

2024-10-30T20:21:12Z

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[[Category:Coding]][[Category:Python]]
Attention: today this is easier:
pip install ipython
...
from IPython import embed
...
embed() # to drop into iPython Shell from within the code

Carsten Knoll wrote a nice module that improves the display of execeptions and allows to open an ipython shell at a certain point of the program code: See [https://github.com/cknoll/ipydex/tree/master]
# ipHelp.py
# by Carsten Knoll
import sys
import new
__version__ = "0.2"
try:
from IPython.Shell import IPShellEmbed
args = ['-pi1','In <\\#>: ','-pi2',' .\\D.: ',
'-po','Out<\\#>: ','-nosep']
class AdaptedIPSE(IPShellEmbed):
def __init__(self, *args, **kwargs):

IPShellEmbed.__init__(self, *args, **kwargs)
old_interact = self.IP.interact # save the real method
def new_interact(self, *args):
self.IP.user_ns.update({'_ips_exit':False})
old_interact(*args) # call the real interact method
if self.IP.user_ns['_ips_exit']:
def do_nothing(*args, **kwargs):
pass
self.IP.interact = do_nothing
self.IP.interact = new.instancemethod(new_interact, self,
type(self))
IPS= AdaptedIPSE(args,
banner = 'Dropping into IPython',
exit_msg = 'Leaving Interpreter, back to program.')
def ip_syshook(pdb=0, mode=2):
import IPython.ultraTB
modus = ['Plain', 'Context', 'Verbose'][mode] # select the mode
sys.excepthook = IPython.ultraTB.FormattedTB(mode=modus,
color_scheme='Linux', call_pdb=pdb)

def ip_extra_syshook(fnc, pdb=0, filename=None):
assert callable(fnc)
import IPython.ultraTB
import time
if not filename == None:
assert isinstance(filename, str)
pdb = 0
ip_excepthook = IPython.ultraTB.FormattedTB(mode='Verbose',
color_scheme='Linux', call_pdb=pdb)
fileTraceback = IPython.ultraTB.FormattedTB(mode='Verbose',
color_scheme='NoColor', call_pdb=0)
def theexecphook (type, value, traceback):
fnc()
ip_excepthook(type, value, traceback)
# write this to a File without Colors
if not filename == None:
outFile = open(filename, "a")
outFile.write("--" + time.ctime()+" --\n")
outFile.write(fileTraceback.text(type, value, traceback))
outFile.write("\n-- --\n")
outFile.close()
sys.excepthook = theexecphook
from IPython.Debugger import Tracer
ST=Tracer()
except ImportError:
# create dummy functions
def IPS():
print "(EE): IPython is not available"
pass
def ip_syshook(*args):
pass

def ST():
pass

Now include this file in your project and place IPS() somewhere in your code to open a shell there.
from ipHelp import IPS, ip_syshook
ip_syshook() # (1) -> debugger on exception
# run IPS() somewhere to open ipython shell

If you have are unsing PyQT and you get the message "QCoreApplication::exec: The event loop is already running", inserting the following into your __init__ of your main class will help:
QtCore.pyqtRemoveInputHook()

Python - ipHelp.py - Revision history

Torben at 20:21, 30 October 2024