pip install git+https://github.com/aristanetworks/arcomm.git

git clone git@github.com:aristanetworks/arcomm.git
cd arcomm
python setup.py install

pip install jinja2

$ arcomm -h
usage: arcomm [-h] [-v] [--protocol PROTOCOL] [--encoding {json,text}]
          [-u USERNAME] [-p PASSWORD] [--authorize]
          [-a AUTHORIZE_PASSWORD] [-t TIMEOUT] [--hosts-file HOSTS_FILE]
          [--script SCRIPT] [--variables VARIABLES]
          [endpoints [endpoints ...]]

positional arguments:
endpoints

optional arguments:
-h, --help            show this help message and exit
-v, --version         Display version info
--protocol PROTOCOL   Set the default protocol or protocols. If more than
                    one is supplied, they will be tried in order
--encoding {json,text}
                    Control output formatting
-u USERNAME, --username USERNAME
                    Specifies the username on the switch
-p PASSWORD, --password PASSWORD
                    Specifies users password. If not supplied, the user
                    will be prompted
--authorize
-a AUTHORIZE_PASSWORD, --authorize-password AUTHORIZE_PASSWORD
                    Use if a password is needed for elevated prvilges
-t TIMEOUT, --timeout TIMEOUT
                    Change the timeout from the default of 30 seconds
--hosts-file HOSTS_FILE
                    Path to file containing list of hosts
--script SCRIPT       Path to a script file containing commands to execute.
                    template variables will be processed if Jinja2 is
                    installed and `--variables` is also supplied on the
                    command line
--variables VARIABLES
                    Replacements for template variables in script file
                    (must be JSON formatted)

$ arcomm veos
Enter commands (one per line).
Enter '.' alone to send or 'Crtl-C' to quit.
> show version
> .
---
host: veos
status: ok
commands:
- command: show version
output: |
  Arista vEOS
  Hardware version:    
  Serial number:       
  System MAC address:  0800.2776.48c5

  Software image version: 4.15.2F
  Architecture:           i386
  Internal build version: 4.15.2F-2663444.4152F
  Internal build ID:      0ebbad93-563f-4920-8ecb-731057802b9c

  Uptime:                 13 hours and 38 minutes
  Total memory:           1897596 kB
  Free memory:            158892 kB

...

$ echo "show version" | arcomm veos
---
host: veos
status: ok
commands:
- command: show version
output: |
  Arista vEOS
  Hardware version:    
  Serial number:       
  System MAC address:  0800.2776.48c5

  Software image version: 4.15.2F
  Architecture:           i386
  Internal build version: 4.15.2F-2663444.4152F
  Internal build ID:      0ebbad93-563f-4920-8ecb-731057802b9c

  Uptime:                 13 hours and 39 minutes
  Total memory:           1897596 kB
  Free memory:            158644 kB

...

$ echo "show clock" | arcomm vswitch1 vswitch2
---
host: vswitch1
status: ok
commands:
- command: show clock
output: |
  Mon Nov 30 16:24:07 2015
  Timezone: UTC
  Clock source: local
---
host: vswitch2
status: ok
commands:
- command: show clock
output: |
  Mon Nov 30 16:23:18 2015
  Timezone: UTC
  Clock source: local
...

$ cat sw-upgrade.script
! script will stop here if file is not found.
dir flash:{{image}}
show ip interface brief
configure
  boot system flash:{{image}}
end
show boot-config

$ cat scaffolding/sw-upgrade.script | arcomm veos --variables='{"image": "vEOS-4.15.2F.swi"}'
---
host: veos
status: ok
commands:
- command: dir flash:vEOS-4.15.2F.swi
output: |
  Directory of flash:/vEOS-4.15.2F.swi

         -rwx   247919507           Oct 15 18:20  vEOS-4.15.2F.swi

  1907843072 bytes total (1168683008 bytes free)
- command: show ip interface brief
output: |
  Interface              IP Address         Status     Protocol         MTU
  Ethernet1              unassigned         up         up              1500
  Ethernet2              unassigned         up         up              1500
  Ethernet3              unassigned         up         up              1500
  Loopback0              1.1.1.1/32         up         up             65535
  Management1            192.168.56.21/24   up         up              1500
- command: configure
output: |

- command: boot system flash:vEOS-4.15.2F.swi
output: |

- command: end
output: |

- command: show boot-config
output: |
  Software image: flash:/vEOS-4.15.2F.swi
  Console speed: (not set)
  Aboot password (encrypted): (not set)
  Memory test iterations: (not set)
...

$ ipython
Python 2.7.6 (default, Mar 22 2014, 22:59:38)
Type "copyright", "credits" or "license" for more information.

IPython 4.0.0 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.

In [1]: import arcomm

In [2]: conn = arcomm.connect('veos', creds=arcomm.BasicCreds('admin', ''),
    protocol='eapi+http')

In [3]: responses = conn.execute(['show clock', 'show version'])

In [4]: for resp in responses:
...:     resp.output
...:     
Mon Nov 16 04:49:41 2015
Timezone: UTC
Clock source: local

Arista vEOS
Hardware version:    
Serial number:       
System MAC address:  0800.2776.48c5

Software image version: 4.15.2F
Architecture:           i386
Internal build version: 4.15.2F-2663444.4152F
Internal build ID:      0ebbad93-563f-4920-8ecb-731057802b9c

Uptime:                 23 hours and 17 minutes
Total memory:           1897596 kB
Free memory:            121844 kB

In [5]:
In [6]: responses = conn.execute(['show version'], encoding='json')

In [7]: for resp in responses:
...:     resp.output
...:     
{u'memTotal': 1897596, u'version': u'4.15.2F',
u'internalVersion': u'4.15.2F-2663444.4152F', u'serialNumber': u'',
u'systemMacAddress': u'08:00:27:76:48:c5',
u'bootupTimestamp': 1447565515.19, u'memFree': 121952,
u'modelName': u'vEOS', u'architecture': u'i386',
u'internalBuildId': u'0ebbad93-563f-4920-8ecb-731057802b9c',
u'hardwareRevision': u''}

In [8]: