Django mysqlclient issue with using Python 3.7.2

Context

I am trying to deploy a django app using mysql. However, an issue arises.

Using sqlite works fine. But, using mysql causes an error that fails to load MySQLdb.

There is nothing wrong with python3.6

An issue occurs in python3.7.

Actual Behavior

get a 502 error from Zappa API

Error: Warning! Status check on the deployed lambda failed. A GET request to '/' yielded a 502 response code.

The ‘zappa tail’ looks like this:

[1553164824234] [ERROR] ImproperlyConfigured: Error loading MySQLdb module.     ) from errask/django/db/backends/mysql/base.py", line 20, in <module>rt_module

Possible Fix

Support for python3.7 in lambda-packages(mysqlclient, etc…)

Steps to Reproduce

1. Deploy Zappa app with using mysqlclient

Your Environment

• Zappa version used: 0.48.2
• Operating System and Python version: mac and 3.7.2
• The output of pip freeze: argcomplete==1.9.3 boto3==1.9.118 botocore==1.12.118 certifi==2019.3.9 cfn-flip==1.1.0.post1 chardet==3.0.4 Click==7.0 Django==2.1.7 django-cors-headers==2.5.2 django-storages==1.7.1 djangorestframework==3.9.2 djangorestframework-stubs==0.3.0 docutils==0.14 durationpy==0.5 future==0.16.0 hjson==3.0.1 idna==2.8 jmespath==0.9.3 kappa==0.6.0 lambda-packages==0.20.0 mysqlclient==1.3.12 placebo==0.9.0 python-dateutil==2.6.1 python-decouple==3.1 python-slugify==1.2.4 pytz==2018.9 PyYAML==5.1 requests==2.21.0 s3transfer==0.2.0 six==1.12.0 toml==0.10.0 tqdm==4.19.1 troposphere==2.4.5 Unidecode==1.0.23 urllib3==1.24.1 Werkzeug==0.15.0 wsgi-request-logger==0.4.6 zappa==0.48.2
• Your zappa_settings.py: { “prod”: { “aws_region”: “ap-northeast-2”, “django_settings”: “LcBot.settings”, “profile_name”: “default”, “project_name”: “lc-bot”, “runtime”: “python3.7”, “s3_bucket”: “lc-bot” } }

[shpyr]

@Kelvin97lui it’s pretty easy to get around that, here’s what I ended up doing:

import pymysql
pymysql.install_as_MySQLdb()
pymysql.version_info = (1, 3, 13, 'final', 0)

^ this is at the top of my settings.py.

[ge0rg]

You can work around the lack of native binaries by using pymysql instead of mysqlclient as described in this SO post:

pip install pymysql

And add to your project’s __init__.py:

import pymysql
pymysql.install_as_MySQLdb()

This will add about 6MB to your ZIP size.