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import os
import warnings
from django.core.management.base import BaseCommand
from django.utils.deprecation import RemovedInDjango20Warning
class Command(BaseCommand):
help = "Runs a Python interactive interpreter. Tries to use IPython or bpython, if one of them is available."
requires_system_checks = False
shells = ['ipython', 'bpython', 'python']
def add_arguments(self, parser):
parser.add_argument(
'--plain', action='store_true', dest='plain',
help='Tells Django to use plain Python, not IPython or bpython. '
'Deprecated, use the `-i python` or `--interface python` option instead.',
)
parser.add_argument(
'--no-startup', action='store_true', dest='no_startup',
help='When using plain Python, ignore the PYTHONSTARTUP environment variable and ~/.pythonrc.py script.',
)
parser.add_argument(
'-i', '--interface', choices=self.shells, dest='interface',
help='Specify an interactive interpreter interface. Available options: "ipython", "bpython", and "python"',
)
parser.add_argument(
'-c', '--command', dest='command',
help='Instead of opening an interactive shell, run a command as Django and exit.',
)
def _ipython_pre_011(self):
"""Start IPython pre-0.11"""
from IPython.Shell import IPShell
shell = IPShell(argv=[])
shell.mainloop()
def _ipython_pre_100(self):
"""Start IPython pre-1.0.0"""
from IPython.frontend.terminal.ipapp import TerminalIPythonApp
app = TerminalIPythonApp.instance()
app.initialize(argv=[])
app.start()
def _ipython(self):
"""Start IPython >= 1.0"""
from IPython import start_ipython
start_ipython(argv=[])
def ipython(self, options):
"""Start any version of IPython"""
for ip in (self._ipython, self._ipython_pre_100, self._ipython_pre_011):
try:
ip()
except ImportError:
pass
else:
return
# no IPython, raise ImportError
raise ImportError("No IPython")
def bpython(self, options):
import bpython
bpython.embed()
def python(self, options):
import code
# Set up a dictionary to serve as the environment for the shell, so
# that tab completion works on objects that are imported at runtime.
imported_objects = {}
try: # Try activating rlcompleter, because it's handy.
import readline
except ImportError:
pass
else:
# We don't have to wrap the following import in a 'try', because
# we already know 'readline' was imported successfully.
import rlcompleter
readline.set_completer(rlcompleter.Completer(imported_objects).complete)
# Enable tab completion on systems using libedit (e.g. Mac OSX).
# These lines are copied from Lib/site.py on Python 3.4.
readline_doc = getattr(readline, '__doc__', '')
if readline_doc is not None and 'libedit' in readline_doc:
readline.parse_and_bind("bind ^I rl_complete")
else:
readline.parse_and_bind("tab:complete")
# We want to honor both $PYTHONSTARTUP and .pythonrc.py, so follow system
# conventions and get $PYTHONSTARTUP first then .pythonrc.py.
if not options['no_startup']:
for pythonrc in (os.environ.get("PYTHONSTARTUP"), '~/.pythonrc.py'):
if not pythonrc:
continue
pythonrc = os.path.expanduser(pythonrc)
if not os.path.isfile(pythonrc):
continue
try:
with open(pythonrc) as handle:
exec(compile(handle.read(), pythonrc, 'exec'), imported_objects)
except NameError:
pass
code.interact(local=imported_objects)
def handle(self, **options):
if options['plain']:
warnings.warn(
"The --plain option is deprecated in favor of the -i python or --interface python option.",
RemovedInDjango20Warning
)
options['interface'] = 'python'
# Execute the command and exit.
if options['command']:
exec(options['command'])
return
available_shells = [options['interface']] if options['interface'] else self.shells
for shell in available_shells:
try:
return getattr(self, shell)(options)
except ImportError:
pass
raise ImportError("Couldn't load any of the specified interfaces.")
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