I got a calender picker. How to select the available day with Selenium and Python?

the available days has a class .calendarCellOpen:

table.calendario .calendarCellOpen input {

}

Here it is the calendar css:

    #calwrapper
    {
    min-height:230px;  
    margin-top:10px;  
    }


    #calendar
    {
    float:left;
    margin-left: 15px; /*Daniele 10-04-2014*/
    }


span.calendario
{
    display:block;
    margin:0;
}

table.fasce
{
    margin-left:20px;
}

table.fasce th
{
    background-image: url( '../images/tab_body.png' );
    background-repeat: repeat-x;
    font-size:12px;
}

table.fasce tr
{
    border-bottom: #f5f4e7 thin dotted;
}

table.calendario
{
    border-top: 0px !important;
}

table.calendario, table.fasce
{
    width: 300px;
    background-color: White !important;
    font-size: 15px;
    border-right: #f5f4e7 1px solid !important;
    border-left: #f5f4e7 1px solid !important;
    border-bottom: #f5f4e7 1px solid !important;
}

table.calendario td, table.fasce td
{
    text-align:center;
}

table.calendario .calTitolo
{
    background-image: url( '../images/tab_body.png' );
    background-repeat: repeat-x;
    margin: 0px !important;
    padding: 0px !important;
    font-size:12px;
}

table.calendario .calTitolo td
{
    padding:0px 5px 0px 5px;
    width:14.3%;
}

table.calendario .calDayHeader /* RIGA */
{   
    background-color:#FCFBF7;
    font-size:12px;
}

table.calendario .otherMonthDay
{
    color: #C0C0C0;
}

table.calendario .cellaSelezionata /* CELLA */
{   
    background-color:#EDEBD5 !important;    
    border-collapse:collapse !important;
    font-weight:bold;   
}

table.calendario .calendarCellOpen input
{
    color:#208020 !important;   /*High availability (green)*/
    font-weight:bold;       
}

table.calendario .calendarCellRed
{
    color:Red !important;   /*noe availability*/ 
    font-weight:bold;   
}

table.calendario .calendarCellMed input
{
    color:#F09643 !important;   /*Disponibilità media*/
    font-weight:bold;   
}


.pulsanteCalendario
{    
    border: 0px;
    background-color: Transparent;
    cursor: pointer;
    padding: 0px 0px 0px 0px;
    margin: 0px;  
    height:20px;
    width:100%;
    overflow:visible; 
    text-align:center;
    font-size:16px;
}

.pulsanteCalendario:hover
{
    text-decoration:underline;
}

#legend
{
    margin-bottom:8px;
    width:100%;    
}

#legend ul
{
    list-style-type:none;
}

   #legend ul li
   {
    display:inline;
    margin-left:20px;
   }

The thing is that i want to select (clicking on it with Selenium) the day available(doesn`t matter which day).Just any day which appears to be available(green).

Here is the calendar:

 elementos = driver.find_elements_by_class_name("calendarCellOpen")
 while True:

            if elementos:
                driver.find_element_by_class_name("calendarCellOpen").click()
                driver.find_element_by_id("ctl00_ContentPlaceHolder1_acc_Calendario1_repFasce_ctl01_btnConferma").click() #confirm button
            else:

                driver.find_element_by_xpath("//input[@value='<']").click()  #back
                if elementos:
                    driver.find_element_by_class_name("calendarCellOpen").click()
                    driver.find_element_by_id("ctl00_ContentPlaceHolder1_acc_Calendario1_repFasce_ctl01_btnConferma").click()

                driver.find_element_by_xpath("//input[@value='>']").click() #forward
                if elementos:
                    driver.find_element_by_class_name("calendarCellOpen").click()
                    driver.find_element_by_id("ctl00_ContentPlaceHolder1_acc_Calendario1_repFasce_ctl01_btnConferma").click()

This some code i made

I made back and foward because is th only way to reload the calendar..