ModuleNotFoundError: No module named 'kombu.asynchronous.timer'解决

报错:

(env) D:python_learnmeiduo_projectmeiduo_mall>celery -A celery_tasks.main worker -l info
Traceback (most recent call last):
  File "D:PythonPython38lib
unpy.py", line 193, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "D:PythonPython38lib
unpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "D:python_learnmeiduo_projectenvScriptscelery.exe\__main__.py", line 7, in <module>
  File "d:python_learnmeiduo_projectenvlibsite-packagescelery\__main__.py", line 16, in main
    _main()
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryincelery.py", line 322, in main
    cmd.execute_from_commandline(argv)
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryincelery.py", line 484, in execute_from_commandline
    super(CeleryCommand, self).execute_from_commandline(argv)))
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryinase.py", line 275, in execute_from_commandline
    return self.handle_argv(self.prog_name, argv[1:])
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryincelery.py", line 476, in handle_argv
    return self.execute(command, argv)
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryincelery.py", line 404, in execute
    return cls(
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryinworker.py", line 223, in run_from_argv
    return self(*args, **options)
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryinase.py", line 238, in __call__
    ret = self.run(*args, **kwargs)
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryinworker.py", line 252, in run
    worker = self.app.Worker(
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryworkerworker.py", line 101, in __init__
    self.setup_instance(**self.prepare_args(**kwargs))
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryworkerworker.py", line 132, in setup_instance
    self.pool_cls = _concurrency.get_implementation(self.pool_cls)
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryconcurrency\__init__.py", line 23, in get_implementation
    return symbol_by_name(cls, ALIASES)
  File "d:python_learnmeiduo_projectenvkombuutilsimports.py", line 56, in symbol_by_name
    module = imp(module_name, package=package, **kwargs)
  File "D:PythonPython38libimportlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryconcurrencyprefork.py", line 18, in <module>
    from celery.concurrency.base import BasePool
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryconcurrencyase.py", line 15, in <module>
    from celery.utils import timer2
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryutils	imer2.py", line 16, in <module>
    from kombu.asynchronous.timer import Entry
ModuleNotFoundError: No module named 'kombu.asynchronous.timer'

搜索到说解决方法是回退版本,

pip uninstall celery && pip install celery==3.1.25

但是回退后又报错

(env) D:python_learnmeiduo_projectmeiduo_mall>celery -A celery_tasks.main worker -l info
Traceback (most recent call last):
  File "D:PythonPython38lib
unpy.py", line 193, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "D:PythonPython38lib
unpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "D:python_learnmeiduo_projectenvScriptscelery.exe\__main__.py", line 7, in <module>
  File "d:python_learnmeiduo_projectenvlibsite-packagescelery\__main__.py", line 30, in main
    main()
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryincelery.py", line 81, in main
    cmd.execute_from_commandline(argv)
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryincelery.py", line 793, in execute_from_commandline
    super(CeleryCommand, self).execute_from_commandline(argv)))
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryinase.py", line 311, in execute_from_commandline
    return self.handle_argv(self.prog_name, argv[1:])
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryincelery.py", line 785, in handle_argv
    return self.execute(command, argv)
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryincelery.py", line 713, in execute
    return cls(
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryinworker.py", line 179, in run_from_argv
    return self(*args, **options)
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryinase.py", line 274, in __call__
    ret = self.run(*args, **kwargs)
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryinworker.py", line 194, in run
    pool_cls = (concurrency.get_implementation(pool_cls) or
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryconcurrency\__init__.py", line 29, in get_implementation
    return symbol_by_name(cls, ALIASES)
  File "d:python_learnmeiduo_projectenvlibsite-packageskombuutils\__init__.py", line 96, in symbol_by_name
    module = imp(module_name, package=package, **kwargs)
  File "D:PythonPython38libimportlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryconcurrencyprefork.py", line 20, in <module>
    from celery.concurrency.base import BasePool
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryconcurrencyase.py", line 21, in <module>
    from celery.utils import timer2
  File "d:python_learnmeiduo_projectenvlibsite-packagesceleryutils	imer2.py", line 19
    from kombu.async.timer import Entry, Timer as Schedule, to_timestamp, logger
               ^
SyntaxError: invalid syntax

然后再次升级到最新版本,不再出现报错:

pip install celery