Find element by class name in Selenium Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the find_element_by_class_name method do in Selenium?

It locates the first web element on the page that matches the specified class name.

beginner

How do you find an element with class name <code>button-primary</code> using Selenium in Python?

Use driver.find_element(By.CLASS_NAME, 'button-primary') after importing By from selenium.webdriver.common.by.

intermediate

Why should you avoid using find_element_by_class_name with multiple classes?

Because it only accepts a single class name. If you pass multiple classes separated by spaces, it will cause an error or fail to find the element.

beginner

What is a good real-life analogy for finding an element by class name?

It's like looking for a person wearing a specific uniform in a crowd. The uniform (class name) helps you spot them quickly.

intermediate

What should you do if multiple elements share the same class name but you want to interact with all of them?

Use find_elements(By.CLASS_NAME, 'class-name') to get a list of all matching elements and then loop through them.

Which Selenium method finds the first element with a given class name?

A find_elements(By.CLASS_NAME, 'name')

B find_element(By.ID, 'name')

C find_element_by_tag_name('name')

D find_element(By.CLASS_NAME, 'name')

The method find_element(By.CLASS_NAME, 'name') finds the first element with the specified class name.

What happens if you pass multiple class names separated by spaces to find_element(By.CLASS_NAME, ...)?

A It throws an error or fails to find the element

B It finds elements matching all classes

C It finds the first class only

D It ignores the class name and finds by tag

The method expects a single class name. Passing multiple classes separated by spaces causes failure.

If you want to get all elements with the same class name, which method should you use?

A find_element(By.CLASS_NAME, 'class')

B find_elements(By.CLASS_NAME, 'class')

C find_element_by_id('class')

D find_elements_by_tag_name('class')

Use find_elements(By.CLASS_NAME, 'class') to get all matching elements as a list.

Which import is needed to use By.CLASS_NAME in Selenium Python?

A from selenium.webdriver.common.keys import By

B import selenium.webdriver.By

C from selenium.webdriver.common.by import By

D from selenium.webdriver.common.classname import By

You must import By from selenium.webdriver.common.by to use By.CLASS_NAME.

What is the best practice when locating elements by class name?

A Use a single class name without spaces

B Use XPath only

C Use tag name instead

D Use multiple class names separated by spaces

Always use a single class name without spaces for reliable element location.

Explain how to find a web element by class name using Selenium in Python. Include import statements and example code.

Think about how you tell Selenium which locator strategy to use.

Describe the limitations and best practices when using class name as a locator in Selenium.

Consider what happens if you pass multiple classes or want multiple elements.

Practice

1. What does the Selenium method find_element(By.CLASS_NAME, "example") do?

easy

A. Finds elements by their ID "example".

B. Finds all elements with the class name "example" on the webpage.

C. Finds elements by their tag name "example".

D. Finds the first element with the class name "example" on the webpage.

Solution

1. Step 1: Understand the method purpose

   The method find_element locates a single element on the page.

2. Step 2: Identify the locator type

   Using By.CLASS_NAME means it looks for the first element with the given class name.

3. Final Answer:

   Finds the first element with the class name "example" on the webpage. -> Option D

4. Quick Check:

   find_element + CLASS_NAME = first matching element [OK]

Hint: find_element with CLASS_NAME finds only the first matching element [OK]

Common Mistakes:

• Confusing find_element with find_elements (plural)
• Using class name but expecting multiple elements
• Mixing class name with ID or tag name locators

2. Which of the following is the correct syntax to find an element by class name "btn-primary" using Selenium in Python?

easy

A. driver.find_element(By.CLASS_NAME, "btn-primary")

B. driver.find_element_by_class_name("btn-primary")

C. driver.find_element(By.CLASS, "btn-primary")

D. driver.find_element(By.CLASSNAME, "btn-primary")

Solution

1. Step 1: Recall the correct Selenium syntax

   In Selenium Python 4+, the recommended syntax is find_element(By.CLASS_NAME, "class").

2. Step 2: Check each option for correctness

   driver.find_element(By.CLASS_NAME, "btn-primary") uses the correct locator By.CLASS_NAME and method find_element. Others use deprecated or incorrect locators.

3. Final Answer:

   driver.find_element(By.CLASS_NAME, "btn-primary") -> Option A

4. Quick Check:

   Use By.CLASS_NAME with find_element [OK]

Hint: Use By.CLASS_NAME with find_element, not old deprecated methods [OK]

Common Mistakes:

• Using deprecated find_element_by_class_name method
• Wrong locator names like CLASS or CLASSNAME
• Missing quotes around class name string

3. Given the HTML snippet:

<div class="alert success">Success!</div>
<div class="alert error">Error!</div>

What text will this Selenium Python code print?

element = driver.find_element(By.CLASS_NAME, "alert")
print(element.text)

medium

A. "Success!"

B. "Error!"

C. "Success! Error!"

D. Throws NoSuchElementException

Solution

1. Step 1: Understand find_element behavior

   It finds the first element matching the class name "alert" in the HTML order.

2. Step 2: Identify the first matching element

   The first <div> with class "alert success" contains text "Success!".

3. Final Answer:

   "Success!" -> Option A

4. Quick Check:

   find_element returns first matching element's text [OK]

Hint: find_element returns first match only, so text is from first element [OK]

Common Mistakes:

• Assuming it returns all matching elements' text
• Confusing class names with multiple classes
• Expecting an error if multiple classes exist

4. What is wrong with this Selenium Python code snippet?

element = driver.find_element(By.CLASS_NAME, ".button")

medium

A. find_element should be find_elements to find class

B. Class name should not include the dot prefix "."

C. By.CLASS_NAME is not a valid locator

D. The class name must be uppercase

Solution

1. Step 1: Check the class name format

   When using By.CLASS_NAME, the class name should be given without any CSS selector symbols like ".".

2. Step 2: Identify the error in the code

   The code incorrectly includes a dot prefix ".button" which causes a failure to find the element.

3. Final Answer:

   Class name should not include the dot prefix "." -> Option B

4. Quick Check:

   Class name locator needs plain class name, no dot [OK]

Hint: Remove dot prefix when using By.CLASS_NAME locator [OK]

Common Mistakes:

• Adding dot prefix like CSS selectors to class name
• Using find_elements when only one element is needed
• Assuming class names must be uppercase

5. You want to click the first button with class "submit-btn" on a page. Which code snippet correctly finds and clicks it using Selenium Python?

hard

A. button = driver.find_elements(By.CLASS_NAME, "submit-btn")
button.click()

B. button = driver.find_element(By.ID, "submit-btn")
button.click()

C. button = driver.find_element(By.CLASS_NAME, "submit-btn")
button.click()

D. button = driver.find_element(By.CLASS_NAME, ".submit-btn")
button.click()

Solution

1. Step 1: Choose correct method to find single element by class

   Use find_element(By.CLASS_NAME, "submit-btn") to get the first matching element.

2. Step 2: Call click() on the found element

   After locating the element, call click() to perform the click action.

3. Final Answer:

   button = driver.find_element(By.CLASS_NAME, "submit-btn")\nbutton.click() -> Option C

4. Quick Check:

   find_element + CLASS_NAME + click() = correct usage [OK]

Hint: Use find_element with class name, then call click() on it [OK]

Common Mistakes:

• Using find_elements returns list, cannot call click() directly
• Using ID locator instead of class name
• Including dot prefix in class name