I try to make some automations using Python+selenium (new to this). Unfortunatelly, inspecting elements of a specific webpage is more than hard. There is no id to use and I try xpath. 
I want to select a drop down list , i inspect this element and I copy the xpath which is 
//\*[@id="frmMain:criteria:purchase\_criteria\_tab"]/div[13]/div[1]/div/button

my code is:

```
    NEXT_BUTTON_XPATH = "//*[@id='frmMain:criteria:purchase_criteria_tab']/div[13]/div[1]/div/button"
wait = WebDriverWait(driver, 10)
condition = expected_conditions.presence_of_element_located(
    (By.XPATH, NEXT_BUTTON_XPATH))
button = wait.until(condition)
button.click()

```

and I cannot get the element
Any ideas? Thank you in advance.