当我在本地服务器上启动Django项目时，该错误不起作用。
似乎终于有了Django的ImportError，但首先我要解决眉毛错误。
因为，我检查是否已安装Django，添加了确切的路径并激活了虚拟环境。
ModuleNotFoundError: No module named 'django.utils.inspect'
在这种情况下，我该怎么办？
您介意告诉我如何解决这个问题吗？
谢谢。
详细错误
Traceback (most recent call last):
File "/Users/apple/GoogleDrive/project_django/harvest_timer/manage.py", line 10, in main
from django.core.management import execute_from_command_line
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/core/management/__init__.py", line 13, in <module>
from django.core.management.base import (
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/core/management/base.py", line 11, in <module>
from django.core import checks
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/core/checks/__init__.py", line 8, in <module>
import django.core.checks.caches # NOQA isort:skip
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/core/checks/caches.py", line 2, in <module>
from django.core.cache import DEFAULT_CACHE_ALIAS
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/core/cache/__init__.py", line 18, in <module>
from django.core import signals
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/core/signals.py", line 1, in <module>
from django.dispatch import Signal
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/dispatch/__init__.py", line 9, in <module>
from django.dispatch.dispatcher import Signal, receiver # NOQA
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/dispatch/dispatcher.py", line 4, in <module>
from django.utils.inspect import func_accepts_kwargs
ModuleNotFoundError: No module named 'django.utils.inspect'
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/Users/apple/GoogleDrive/project_django/project/manage.py", line 21, in <module>
main()
File "/Users/apple/GoogleDrive/project_django/project/manage.py", line 16, in main
) from exc
ImportError: Couldn't import Django. Are you sure it's installed and available on your PYTHONPATH environment variable? Did you forget to activate a virtual environment?
dispatcher.py
import threading
import weakref
from django.utils.inspect import func_accepts_kwargs
def _make_id(target):
if hasattr(target, '__func__'):
return (id(target.__self__), id(target.__func__))
return id(target)
NONE_ID = _make_id(None)
# A marker for caching
NO_RECEIVERS = object()
class Signal:
"""
Base class for all signals
Internal attributes:
receivers
{ receiverkey (id) : weakref(receiver) }
"""
def __init__(self, providing_args=None, use_caching=False):
"""
Create a new signal.
providing_args
A list of the arguments this signal can pass along in a send() call.
"""
self.receivers = []
if providing_args is None:
providing_args = []
self.providing_args = set(providing_args)
self.lock = threading.Lock()
self.use_caching = use_caching
# For convenience we create empty caches even if they are not used.
# A note about caching: if use_caching is defined, then for each
# distinct sender we cache the receivers that sender has in
# 'sender_receivers_cache'. The cache is cleaned when .connect() or
# .disconnect() is called and populated on send().
self.sender_receivers_cache = weakref.WeakKeyDictionary() if use_caching else {}
self._dead_receivers = False
def connect(self, receiver, sender=None, weak=True, dispatch_uid=None):
"""
Connect receiver to sender for signal.
Arguments:
receiver
A function or an instance method which is to receive signals.
Receivers must be hashable objects.
If weak is True, then receiver must be weak referenceable.
Receivers must be able to accept keyword arguments.
If a receiver is connected with a dispatch_uid argument, it
will not be added if another receiver was already connected
with that dispatch_uid.
sender
The sender to which the receiver should respond. Must either be
a Python object, or None to receive events from any sender.
weak
Whether to use weak references to the receiver. By default, the
module will attempt to use weak references to the receiver
objects. If this parameter is false, then strong references will
be used.
dispatch_uid
An identifier used to uniquely identify a particular instance of
a receiver. This will usually be a string, though it may be
anything hashable.
"""
from django.conf import settings
# If DEBUG is on, check that we got a good receiver
if settings.configured and settings.DEBUG:
assert callable(receiver), "Signal receivers must be callable."
# Check for **kwargs
if not func_accepts_kwargs(receiver):
raise ValueError("Signal receivers must accept keyword arguments (**kwargs).")
if dispatch_uid:
lookup_key = (dispatch_uid, _make_id(sender))
else:
lookup_key = (_make_id(receiver), _make_id(sender))
if weak:
ref = weakref.ref
receiver_object = receiver
# Check for bound methods
if hasattr(receiver, '__self__') and hasattr(receiver, '__func__'):
ref = weakref.WeakMethod
receiver_object = receiver.__self__
receiver = ref(receiver)
weakref.finalize(receiver_object, self._remove_receiver)
with self.lock:
self._clear_dead_receivers()
if not any(r_key == lookup_key for r_key, _ in self.receivers):
self.receivers.append((lookup_key, receiver))
self.sender_receivers_cache.clear()
def disconnect(self, receiver=None, sender=None, dispatch_uid=None):
"""
Disconnect receiver from sender for signal.
If weak references are used, disconnect need not be called. The receiver
will be removed from dispatch automatically.
Arguments:
receiver
The registered receiver to disconnect. May be none if
dispatch_uid is specified.
sender
The registered sender to disconnect
dispatch_uid
the unique identifier of the receiver to disconnect
"""
if dispatch_uid:
lookup_key = (dispatch_uid, _make_id(sender))
else:
lookup_key = (_make_id(receiver), _make_id(sender))
disconnected = False
with self.lock:
self._clear_dead_receivers()
for index in range(len(self.receivers)):
(r_key, _) = self.receivers[index]
if r_key == lookup_key:
disconnected = True
del self.receivers[index]
break
self.sender_receivers_cache.clear()
return disconnected
def has_listeners(self, sender=None):
return bool(self._live_receivers(sender))
def send(self, sender, **named):
"""
Send signal from sender to all connected receivers.
If any receiver raises an error, the error propagates back through send,
terminating the dispatch loop. So it's possible that all receivers
won't be called if an error is raised.
Arguments:
sender
The sender of the signal. Either a specific object or None.
named
Named arguments which will be passed to receivers.
Return a list of tuple pairs [(receiver, response), ... ].
"""
if not self.receivers or self.sender_receivers_cache.get(sender) is NO_RECEIVERS:
return []
return [
(receiver, receiver(signal=self, sender=sender, **named))
for receiver in self._live_receivers(sender)
]
def send_robust(self, sender, **named):
"""
Send signal from sender to all connected receivers catching errors.
Arguments:
sender
The sender of the signal. Can be any Python object (normally one
registered with a connect if you actually want something to
occur).
named
Named arguments which will be passed to receivers. These
arguments must be a subset of the argument names defined in
providing_args.
Return a list of tuple pairs [(receiver, response), ... ].
If any receiver raises an error (specifically any subclass of
Exception), return the error instance as the result for that receiver.
"""
if not self.receivers or self.sender_receivers_cache.get(sender) is NO_RECEIVERS:
return []
# Call each receiver with whatever arguments it can accept.
# Return a list of tuple pairs [(receiver, response), ... ].
responses = []
for receiver in self._live_receivers(sender):
try:
response = receiver(signal=self, sender=sender, **named)
except Exception as err:
responses.append((receiver, err))
else:
responses.append((receiver, response))
return responses
def _clear_dead_receivers(self):
# Note: caller is assumed to hold self.lock.
if self._dead_receivers:
self._dead_receivers = False
self.receivers = [
r for r in self.receivers
if not(isinstance(r[1], weakref.ReferenceType) and r[1]() is None)
]
def _live_receivers(self, sender):
"""
Filter sequence of receivers to get resolved, live receivers.
This checks for weak references and resolves them, then returning only
live receivers.
"""
receivers = None
if self.use_caching and not self._dead_receivers:
receivers = self.sender_receivers_cache.get(sender)
# We could end up here with NO_RECEIVERS even if we do check this case in
# .send() prior to calling _live_receivers() due to concurrent .send() call.
if receivers is NO_RECEIVERS:
return []
if receivers is None:
with self.lock:
self._clear_dead_receivers()
senderkey = _make_id(sender)
receivers = []
for (receiverkey, r_senderkey), receiver in self.receivers:
if r_senderkey == NONE_ID or r_senderkey == senderkey:
receivers.append(receiver)
if self.use_caching:
if not receivers:
self.sender_receivers_cache[sender] = NO_RECEIVERS
else:
# Note, we must cache the weakref versions.
self.sender_receivers_cache[sender] = receivers
non_weak_receivers = []
for receiver in receivers:
if isinstance(receiver, weakref.ReferenceType):
# Dereference the weak reference.
receiver = receiver()
if receiver is not None:
non_weak_receivers.append(receiver)
else:
non_weak_receivers.append(receiver)
return non_weak_receivers
def _remove_receiver(self, receiver=None):
# Mark that the self.receivers list has dead weakrefs. If so, we will
# clean those up in connect, disconnect and _live_receivers while
# holding self.lock. Note that doing the cleanup here isn't a good
# idea, _remove_receiver() will be called as side effect of garbage
# collection, and so the call can happen while we are already holding
# self.lock.
self._dead_receivers = True
def receiver(signal, **kwargs):
"""
A decorator for connecting receivers to signals. Used by passing in the
signal (or list of signals) and keyword arguments to connect::
@receiver(post_save, sender=MyModel)
def signal_receiver(sender, **kwargs):
...
@receiver([post_save, post_delete], sender=MyModel)
def signals_receiver(sender, **kwargs):
...
"""
def _decorator(func):
if isinstance(signal, (list, tuple)):
for s in signal:
s.connect(func, **kwargs)
else:
signal.connect(func, **kwargs)
return func
return _decorator
错误代码
Traceback (most recent call last):
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/core/management/__init__.py", line 337, in execute
autoreload.check_errors(django.setup)()
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/utils/autoreload.py", line 54, in wrapper
fn(*args, **kwargs)
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/__init__.py", line 16, in setup
from django.urls import set_script_prefix
ImportError: cannot import name 'set_script_prefix' from 'django.urls' (unknown location)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/Users/apple/GoogleDrive/project_django/project/manage.py", line 21, in <module>
main()
File "/Users/apple/GoogleDrive/project_django/project/manage.py", line 17, in main
execute_from_command_line(sys.argv)
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
utility.execute()
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/core/management/__init__.py", line 350, in execute
_parser = self.fetch_command('runserver').create_parser('django', 'runserver')
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/core/management/__init__.py", line 224, in fetch_command
klass = load_command_class(app_name, subcommand)
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/core/management/__init__.py", line 36, in load_command_class
module = import_module('%s.management.commands.%s' % (app_name, name))
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/Users/apple/GoogleDrive/harvest_timer_django/venv/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 10, in <module>
from django.core.servers.basehttp import (
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/core/servers/basehttp.py", line 17, in <module>
from django.core.handlers.wsgi import LimitedStream
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/core/handlers/wsgi.py", line 8, in <module>
from django.core.handlers import base
File "/Users/apple/GoogleDrive/project_django/venv/lib/python3.7/site-packages/django/core/handlers/base.py", line 8, in <module>
from django.urls import get_resolver, set_urlconf
ImportError: cannot import name 'get_resolver' from 'django.urls' (unknown location)
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