Save configuration with Netmiko

I think the Issue that (config_commands) send command in system view mode
while (Save) should be execute in user view mode

No, I don't agree with that.
When you type 'return', the system returns to view mode, then the 'save' command can be executed normally, as you pasted the result previously. The problem is after typing the 'save', 'y' or 'n' should be followed, and will you please try the config_commands below:
config_commands = [ 'int loop 1',
'ip add 1.1.1.1 255.255.255.0',
'return',
'save',
'y',]

same error

on cisco switches it works because i can save config with command (do wr ) in configuration mode
no need to return to user mode

Hi,
I found an alternative way to save the configuration. Please refer to the code below:
config_commands=[
'int loop0',
'ip add 10.2.1.1 32',
'return',
]
output=net_connect.send_config_set(config_commands)
net_connect.save_config('save') //save the configuration after sending the commands.

config_commands=['int loop0',

                 'ip add 10.2.1.1 32',

                 'return',

                ]

output=net_connect.send_config_set(config_commands)

net_connect.save_config('save')

print(output)

result

system-view

Enter system view, return user view with Ctrl+Z.

[BLD2-1ST-B2]int loop0

[BLD2-1ST-B2-LoopBack0]ip add 10.2.1.1 32

[BLD2-1ST-B2-LoopBack0]return

<BLD2-1ST-B2>

but idont know if it saved or not 

save command not print out

finally its work

config_commands=['int loop0',

                 'ip add 10.2.1.1 32',

                 'return',

                ]

output=net_connect.send_config_set(config_commands)

output=net_connect.save_config('save')

print(output0

print(output)