def get_basic_info(driver,url):
    """get the birthday and gender info from a user url"""
    driver.get(url+"/about_contact_and_basic_info")
    try:
        BirthDay=driver.find_element_by_xpath(".//li[contains(@class, '_3pw9 _2pi4 _2ge8 _4vs2')]").text
    except:
        BirthDay=''
    try:
        Gender=driver.find_element_by_xpath(".//li[contains(@class, '_3pw9 _2pi4 _2ge8 _3ms8')]").text
    except:    
        Gender=''
    return(BirthDay,Gender)