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import os
import select
import sys
import traceback
from django.core.management import BaseCommand, CommandError
from django.utils.datastructures import OrderedSet
class Command(BaseCommand):
help = (
"Runs a Python interactive interpreter. Tries to use IPython or "
"bpython, if one of them is available. Any standard input is executed "
"as code."
)
requires_system_checks = []
shells = ["ipython", "bpython", "python"]
def add_arguments(self, parser):
parser.add_argument(
"--no-startup",
action="store_true",
help=(
"When using plain Python, ignore the PYTHONSTARTUP environment "
"variable and ~/.pythonrc.py script."
),
)
parser.add_argument(
"-i",
"--interface",
choices=self.shells,
help=(
"Specify an interactive interpreter interface. Available options: "
'"ipython", "bpython", and "python"'
),
)
parser.add_argument(
"-c",
"--command",
help=(
"Instead of opening an interactive shell, run a command as Django and "
"exit."
),
)
def ipython(self, options):
from IPython import start_ipython
start_ipython(argv=[])
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.
imported_objects = {}
# 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 OrderedSet(
[os.environ.get("PYTHONSTARTUP"), os.path.expanduser("~/.pythonrc.py")]
):
if not pythonrc:
continue
if not os.path.isfile(pythonrc):
continue
with open(pythonrc) as handle:
pythonrc_code = handle.read()
# Match the behavior of the cpython shell where an error in
# PYTHONSTARTUP prints an exception and continues.
try:
exec(compile(pythonrc_code, pythonrc, "exec"), imported_objects)
except Exception:
traceback.print_exc()
# By default, this will set up readline to do tab completion and to read and
# write history to the .python_history file, but this can be overridden by
# $PYTHONSTARTUP or ~/.pythonrc.py.
try:
hook = sys.__interactivehook__
except AttributeError:
# Match the behavior of the cpython shell where a missing
# sys.__interactivehook__ is ignored.
pass
else:
try:
hook()
except Exception:
# Match the behavior of the cpython shell where an error in
# sys.__interactivehook__ prints a warning and the exception
# and continues.
print("Failed calling sys.__interactivehook__")
traceback.print_exc()
# Set up tab completion for objects imported by $PYTHONSTARTUP or
# ~/.pythonrc.py.
try:
import readline
import rlcompleter
readline.set_completer(rlcompleter.Completer(imported_objects).complete)
except ImportError:
pass
# Start the interactive interpreter.
code.interact(local=imported_objects)
def handle(self, **options):
# Execute the command and exit.
if options["command"]:
exec(options["command"], globals())
return
# Execute stdin if it has anything to read and exit.
# Not supported on Windows due to select.select() limitations.
if (
sys.platform != "win32"
and not sys.stdin.isatty()
and select.select([sys.stdin], [], [], 0)[0]
):
exec(sys.stdin.read(), globals())
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 CommandError("Couldn't import {} interface.".format(shell))
|
