Connecting Nodes with pymel.

connecting.py

'''
This script will create an attribute called joint_vis on the first selected and then connect it to the visibility to the second selected.
You wll need to have two object in your scene selected to make this example work.
Mainly this script is a demo of connecting and disconecting attributes using pymel.

'''
import pymel.core as pm

selected = pm.ls(selection=True)

driver = selected[0]
driven = selected[1]


driver.addAttr('joint_vis', at='long', keyable=True, min=0, max=1)

# Creating the connection
driver.joint_vis >> driven.v

# Disconnecting the connection
#driver.v // driven.v

# Many hardcore python developers do not like using the operators >> and //
# Maya has pm.connectAttr() and pm.disconnectAttr()
# This can also be done through methods too connect and disconnect.

# driver.joint_vis.connect(driven.v)
# driver.joint_vis.disconnect(driven.v)

# http://help.autodesk.com/cloudhelp/2015/ENU/Maya-Tech-Docs/PyMel/attributes.html?highlight=connectattr