Informational: invoke_shell() broke in Paramiko 2.1

[ebeahan]

Paramiko 2.1 was released recently (on 12/9/16) and due to a bug causes the following exception when running ConnectHandler to establish a device connection:

conn = ConnectHandler(**device)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "Envs/tmp-56d6d2813a52c68e/lib/python3.5/site-packages/netmiko/ssh_dispatcher.py", line 96, in ConnectHandler
    return ConnectionClass(*args, **kwargs)
  File "Envs/tmp-56d6d2813a52c68e/lib/python3.5/site-packages/netmiko/base_connection.py", line 89, in __init__
    self.establish_connection()
  File "Envs/tmp-56d6d2813a52c68e/lib/python3.5/site-packages/netmiko/base_connection.py", line 411, in establish_connection
    self.remote_conn = self.remote_conn_pre.invoke_shell()
  File "Envs/tmp-56d6d2813a52c68e/lib/python3.5/site-packages/paramiko/client.py", line 467, in invoke_shell
    chan.update_environment_variables(environment or {})
AttributeError: 'Channel' object has no attribute 'update_environment_variables'

The issue is internal to Paramiko, and I've opened an issue on their end:

paramiko/paramiko#859

[ebeahan]

This issue was resolved: paramiko/paramiko#859 (comment)