Django KeyError <class 'bytes'> in version 1.4.0rc1

[dev-artisan]

Hi,
Just updated my dev server to the latest version (1.4.0rc1) and my Django server crashed when trying to connect to the local MySQL DB installed on Ubuntu server v16
The error occurs in the code below from django/db/backends/mysql/base.py

def get_new_connection(self, conn_params):
        conn = Database.connect(**conn_params)
        conn.encoders[SafeText] = conn.encoders[six.text_type]
        conn.encoders[SafeBytes] = conn.encoders[bytes]
        return conn

Specifically this line
conn.encoders[SafeBytes] = conn.encoders[bytes]

I've reverted back to 1.13.14 and all is well in the world again, hope this helps
Thanks
Omar

[methane]

Thank you for testing RC. It's intended, minor backward incompatible chage.
And the code is removed in Django almost two years ago.
django/django@5b95d42#diff-dbe1511db54b8fff2cb72a199cf37b4c

You need to update Django if you want to use new mysqlclient.

[keviny]

How to resolve this?

[methane]

Update Django.

[dev-artisan]

How to resolve this?

If you're like me and want to stay on long term Django release 1.11, don't update this library to version 1.4.
Stick to version 1.3.14 until you decide to update to Django 2

[fsh905]

I met the same problem,

File "/usr/local/lib/python2.7/site-packages/django/db/backends/mysql/base.py", line 276, in get_new_connection
    conn.encoders[SafeBytes] = conn.encoders[bytes]
KeyError: <type 'str'>

salved by update mysqlclient from 1.4.1 to 1.3.14