example.py

def loadPlugins():
	pluginFiles = ["plugins/" + f for f in listdir(curPath + "\plugins") if re.search('^.+\.py$', f)]
	global plugins
	plugins = []
	for file in pluginFiles:
		values = {}
		execfile(file, values)
		plugin = values['plugin'] # get the variable "plugin"
		print "Initializing plugin:", plugin['name']
		plugins.append(plugin)
        #to get the function call plugin["function"]()

inPluginFolder.py

def function():
	return "1 + 1 = 2"

plugin = {
	'name': "My calc",
	'patterns': ["^/calc (.+)$"],
	'function': function,
	'elevated': False, 
	'usage' : "/calc <exp>",
	'desc' : "calculator"}