SyntaxError: invalid syntax - yield from iterable

[claudiamaximus]

more-itertools version - 8.0.2
python version - 3.6.8

requirements.txt

alembic==1.3.1
amqp==2.5.2
billiard==3.6.1.0
blinker==1.4
celery==4.3.0
certifi==2019.6.16
chardet==3.0.4
Click==7.0
colorama==0.4.1
Flask==1.1.1
Flask-Mail==0.9.1
Flask-Migrate==2.5.2
Flask-SQLAlchemy==2.4.1
idna==2.8
importlib-metadata==1.3.0
itsdangerous==1.1.0
Jinja2==2.10.1
kombu==4.6.7
Mako==1.1.0
MarkupSafe==1.1.1
more-itertools==8.0.2
pymaging==0.1
pymaging-png==0.1
python-dateutil==2.8.1
python-editor==1.0.4
pytz==2019.3
qrcode==6.1
razorpay==1.2.0
requests==2.22.0
six==1.12.0
SQLAlchemy==1.3.11
urllib3==1.25.3
vine==1.3.0
Werkzeug==0.15.5
zipp==0.6.0

__init__.py

...
celery = Celery(app.name, broker=app.config['CELERY_BROKER_URL'])
celery.conf.update(app.config)
...

views/home.py

...
r = send_mail(email).delay(10, 20)
...
@celery.task
def send_mail(email):
    # email stuff

When I run the app, I get the following traceback!

[838493]  mod_wsgi (pid=12557): Exception occurred processing WSGI script '/var/www/myapp.com/public_html/myapp.wsgi'.
[838556]  Traceback (most recent call last):
[838580]    File "/var/www/myapp.com/public_html/myapp.wsgi", line 4, in <module>
[838617]      from myapp import app as application
[838626]    File "/var/www/myapp.com/public_html/myapp/__init__.py", line 13, in <module>
[838642]      from celery import Celery
[838650]    File "/var/www/myapp.com/public_html/venv/lib/python3.6/site-packages/celery/local.py", line 509, in __getattr__
[838665]      module = __import__(self._object_origins[name], None, None, [name])
[838672]    File "/var/www/myapp.com/public_html/venv/lib/python3.6/site-packages/celery/app/__init__.py", line 5, in <module>
[838686]      from celery import _state
[838693]    File "/var/www/myapp.com/public_html/venv/lib/python3.6/site-packages/celery/_state.py", line 17, in <module>
[838705]      from celery.utils.threads import LocalStack
[838712]    File "/var/www/myapp.com/public_html/venv/lib/python3.6/site-packages/celery/utils/__init__.py", line 8, in <module>
[838726]      from .functional import memoize  # noqa
[838745]    File "/var/www/myapp.com/public_html/venv/lib/python3.6/site-packages/celery/utils/functional.py", line 10, in <module>
[838759]      from kombu.utils.functional import (LRUCache, dictfilter, is_list, lazy,
[838766]    File "/var/www/myapp.com/public_html/venv/lib/python3.6/site-packages/kombu/utils/__init__.py", line 5, in <module>
[838779]      from .compat import fileno, maybe_fileno, nested, register_after_fork
[838786]    File "/var/www/myapp.com/public_html/venv/lib/python3.6/site-packages/kombu/utils/compat.py", line 14, in <module>
[838798]      import importlib_metadata
[838805]    File "/var/www/myapp.com/public_html/venv/lib/python3.6/site-packages/importlib_metadata/__init__.py", line 9, in <module>
[838818]      import zipp
[838825]    File "/var/www/myapp.com/public_html/venv/lib/python3.6/site-packages/zipp.py", line 12, in <module>
[838844]      import more_itertools
[838868]    File "/var/www/myapp.com/public_html/venv/lib/python3.6/site-packages/more_itertools/__init__.py", line 1, in <module>
[838893]      from .more import *  # noqa
[838939]    File "/var/www/myapp.com/public_html/venv/lib/python3.6/site-packages/more_itertools/more.py", line 460
[838946]      yield from iterable
[838950]               ^
[838955]  SyntaxError: invalid syntax

WSGI configuration

WSGIDaemonProcess myapp user=myuser group=sudo threads=5 python-path=/var/www/myapp.com:/var/www/myapp.com/public_html/venv/lib/python3.6/site-packages/

WSGIScriptAlias / /var/www/myapp.com/public_html/myapp.wsgi

sys.version

3.6.8 (default, Jan 14 2019, 11:02:34) [GCC 8.0.1 20180414 (experimental) [trunk revision 259383]]

[MSeifert04]

Is it possible that your mod_wsgi runs another Python (maybe Python 2.x)? See for example this StackOverflow answer:

Is the mod_wsgi even compiled for the version of Python you want to use? It is a common mistake that people don't realise that mod_wsgi is actually for a different Python version and so not using the same Python installation as you expect and therefore using different versions of packages.

[bbayles]

@MSeifert04 is correct; this is because more-itertools no longer supports Python 2.7. You can pin the 5.0.0 version to keep using it:

pip install more-itertools==5.0.0

[webknjaz]

Cross-posting a similar Python 3.5 bug: #578.