set up a dictionary to serve as the environment for the shell we want to honor both pythonstartup and pythonrc py so follow system conventions and get pythonstartup first then pythonrc py match the behavior of the cpython shell where an error in pythonstartup prints an exception and continues by default this will set up readline to do tab completion and to read and write history to the pythonhistory file but this can be overridden by pythonstartup or pythonrc py match the behavior of the cpython shell where a missing sys interactivehook is ignored match the behavior of the cpython shell where an error in sys interactivehook prints a warning and the exception and continues set up tab completion for objects imported by pythonstartup or pythonrc py start the interactive interpreter execute the command and exit execute stdin if it has anything to read and exit not supported on windows due to select select limitations set up a dictionary to serve as the environment for the shell we want to honor both pythonstartup and pythonrc py so follow system conventions and get pythonstartup first then pythonrc py match the behavior of the cpython shell where an error in pythonstartup prints an exception and continues 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 match the behavior of the cpython shell where a missing sys __interactivehook__ is ignored match the behavior of the cpython shell where an error in sys __interactivehook__ prints a warning and the exception and continues set up tab completion for objects imported by pythonstartup or pythonrc py start the interactive interpreter execute the command and exit execute stdin if it has anything to read and exit not supported on windows due to select select limitations
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

        
        imported_objects = {}

        
        
        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()
                
                
                try:
                    exec(compile(pythonrc_code, pythonrc, "exec"), imported_objects)
                except Exception:
                    traceback.print_exc()

        
        
        
        try:
            hook = sys.__interactivehook__
        except AttributeError:
            
            
            pass
        else:
            try:
                hook()
            except Exception:
                
                
                
                print("Failed calling sys.__interactivehook__")
                traceback.print_exc()

        
        
        try:
            import readline
            import rlcompleter

            readline.set_completer(rlcompleter.Completer(imported_objects).complete)
        except ImportError:
            pass

        
        code.interact(local=imported_objects)

    def handle(self, **options):
        
        if options["command"]:
            exec(options["command"], globals())
            return

        
        
        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))