Selenium find element and click

I've this html markup , my target is find th element class an then click on it using selenium

<div class="float_left buttons">
  <a href="#" class="button button-3 j-save float_left j-retailer-start-order-submit">Export</a>    
</div>

I've tried :

WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.CLASS_NAME, "a[class='button button-3 j-save float_left j-retailer-start-order-submit']"))).click()

WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.CSS_SELECTOR, "a[class='.button.button-3.j-save.float_left.j-retailer-start-order-submit']"))).click()

what is wrong?, tnx for your help

Try either of the below two lines of code instead:

WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//a[@class='button button-3 j-save float_left j-retailer-start-order-submit']"))).click()

WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//a[text()='Export']"))).click()

Issues in your code:

In the below code, while using By.CLASS_NAME locator strategy, there should not be space between class names

By.CLASS_NAME, "a[class='button button-3 j-save float_left j-retailer-start-order-submit']"

In the below code, The CSS selector should not contain dots (.) before each class name within the square brackets. Also, the class attribute should only contain the space-separated class names without any dots.

By.CSS_SELECTOR, "a[class='.button.button-3.j-save.float_left.j-retailer-start-order-submit']"

This will click on that link:

element = WebDriverWait(self.driver, 20).until(EC.element_to_be_clickable(
    (By.CSS_SELECTOR, "a.j-save")
))

Or if more than one element has the j-save class, use this:

element = WebDriverWait(self.driver, 20).until(EC.element_to_be_clickable(
    (By.CSS_SELECTOR, "a.j-retailer-start-order-submit")
))

You can also use By.LINK_TEXT with "Export" (for a tag elements only), assuming that's the only Export button on the page.