Hi Cezar Jr,

Ofcourse this is possible! Just add the code inside your function that is triggered by a button. Don't forget to import your external Python library though! Let me show you an example. A new form with a button (xml):

<openerp>
    <data>
	<record model="ir.ui.view" id="view_buttons_form">
	    <field name="name">Buttons</field>
	    <field name="model">button.demo</field>
	    <field name="type">form</field>
	    <field name="arch" type="xml">
	        <form string="Button record">
		    <!--The header tag is built to add buttons within. This puts them at the top -->
		    <header>
			<!--The oe_highlight class gives the button a red color when it is saved.
			It is usually used to indicate the expected behaviour. -->
		        <button string="Run external function" type="object" name="run_external_function" class="oe_highlight"/>
		    </header>
		    <group>
			<field name="name"/>
		    </group>
		</form>
	    </field>
	</record>
    </data>
</openerp>

<button string="Run external function" type="object" name="run_external_function" class="oe_highlight"/>

Next just create a Python function that calls your code:

# WARNING! @api.one is deprecated in Odoo 9, use @api.multi with ensure_one instead!
@api.one
def run_external_function(self):
    #From here on you can execute all the code you want. Don't forget to import the external Python library at the top though!
     conn.sendall(vd_comms.setGateOpen(_tid))