Find element by ID in Selenium Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ locator

intermediate

Identify the correct Selenium locator for element by ID

Which of the following Selenium Python commands correctly finds an element by its ID "submit-btn"?

A driver.find_element(By.NAME, "submit-btn")

B driver.find_element_by_id("submit-btn")

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

D driver.find_element(By.ID, "submit-btn")

💡 Hint

Use the modern Selenium syntax with By.ID for locating by ID.

In Selenium 4+, the recommended way to find elements by ID is using driver.find_element(By.ID, "id_value"). The older method find_element_by_id is deprecated. Using CLASS_NAME or NAME will not find by ID.

❓ assertion

intermediate

Check if element found by ID is visible

Given you found an element by ID "login-input", which assertion correctly verifies the element is visible on the page?

Selenium Python

element = driver.find_element(By.ID, "login-input")

A assert element.is_displayed() == True

B assert element.is_enabled() == False

C assert element.text == ""

D assert element.get_attribute('visible') == 'true'

💡 Hint

Use the Selenium method that checks if an element is visible.

The is_displayed() method returns True if the element is visible. is_enabled() checks if element is enabled for interaction, not visibility. text and get_attribute('visible') do not reliably indicate visibility.

❓ Predict Output

advanced

Output of Selenium find_element by ID with missing element

What error will this Selenium Python code raise if no element with ID "nonexistent" is found?

Selenium Python

element = driver.find_element(By.ID, "nonexistent")

A selenium.common.exceptions.NoSuchElementException

B AttributeError

C No error, returns None

D TimeoutException

💡 Hint

Think about what Selenium does when it cannot find an element immediately.

find_element throws NoSuchElementException if the element is not found. It does not return None or raise AttributeError or TimeoutException by default.

🔧 Debug

advanced

Debug why find_element by ID fails

You wrote this code but it fails to find the element by ID "search-box". What is the most likely reason?

Selenium Python

element = driver.find_element(By.ID, "search-box")
element.send_keys("test")

A The element is disabled, so find_element cannot find it

B The element is inside an iframe and driver did not switch to it

C The ID "search-box" is misspelled in the code

D The page has not fully loaded, so the element is not present yet

💡 Hint

Think about elements inside frames and how Selenium handles them.

If the element is inside an iframe, Selenium cannot find it unless you switch to that iframe first. Misspelling or page load issues can cause failure but the most common cause is iframe context.

❓ framework

expert

Best practice for waiting for element by ID before interaction

Which Selenium Python code snippet correctly waits up to 10 seconds for an element with ID "submit" to be clickable before clicking it?

A driver.find_element(By.ID, "submit").click() # No wait

B

time.sleep(10)
driver.find_element(By.ID, "submit").click()

C WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.ID, "submit"))).click()

D

driver.implicitly_wait(10)
driver.find_element(By.ID, "submit").click()

💡 Hint

Use explicit waits with expected conditions for reliable interaction.

Explicit wait with WebDriverWait and expected_conditions ensures the element is clickable before clicking. time.sleep is unreliable and slows tests. Implicit wait waits for presence but not clickability.

Practice

1. What is the correct way to find an element by its ID using Selenium in Python?

easy

A. driver.find_element(By.CLASS_NAME, "element_id")

B. driver.find_element(By.ID, "element_id")

C. driver.find_element_by_id("element_id")

D. driver.find_element(By.NAME, "element_id")

Solution

1. Step 1: Understand Selenium's recommended syntax

   In Selenium Python, the preferred way to find elements by ID is using find_element(By.ID, "id") with the By class.

2. Step 2: Compare options

   driver.find_element(By.ID, "element_id") uses the correct syntax. driver.find_element_by_id("element_id") is deprecated in newer Selenium versions. Options A and D use wrong locator strategies.

3. Final Answer:

   driver.find_element(By.ID, "element_id") -> Option B

4. Quick Check:

   Use By.ID for ID locator [OK]

Hint: Always use By.ID with find_element for IDs [OK]

Common Mistakes:

• Using deprecated find_element_by_id method
• Confusing ID with class or name locators
• Missing import of By class

2. Which of the following is the correct import statement to use By.ID in Selenium Python?

easy

A. from selenium.webdriver.common.by import By

B. import selenium.webdriver.By as By

C. from selenium.webdriver.common.by import ID

D. from selenium.webdriver import By

Solution

1. Step 1: Identify the correct import path

   The By class is located in selenium.webdriver.common.by module.

2. Step 2: Validate options

   from selenium.webdriver.common.by import By correctly imports By. import selenium.webdriver.By as By uses invalid syntax. from selenium.webdriver.common.by import ID tries to import ID which doesn't exist. from selenium.webdriver import By imports By from wrong module.

3. Final Answer:

   from selenium.webdriver.common.by import By -> Option A

4. Quick Check:

   Import By from common.by [OK]

Hint: Import By from selenium.webdriver.common.by [OK]

Common Mistakes:

• Trying to import ID instead of By
• Incorrect module path for By
• Using alias import incorrectly

3. What will be the output of the following code snippet if the element with ID 'submit-btn' exists on the page?

from selenium import webdriver
from selenium.webdriver.common.by import By

driver = webdriver.Chrome()
element = driver.find_element(By.ID, "submit-btn")
print(element.tag_name)

medium

A. Prints the tag name of the element with ID 'submit-btn'

B. Throws NoSuchElementException

C. Prints 'submit-btn'

D. SyntaxError due to wrong method

Solution

1. Step 1: Understand find_element behavior

   If the element with ID 'submit-btn' exists, find_element returns the WebElement object.

2. Step 2: Check what element.tag_name returns

   The tag_name attribute returns the HTML tag name of the found element, e.g., 'button' or 'input'.

3. Final Answer:

   Prints the tag name of the element with ID 'submit-btn' -> Option A

4. Quick Check:

   find_element returns element; tag_name prints tag [OK]

Hint: tag_name shows element's HTML tag [OK]

Common Mistakes:

• Assuming print shows the ID instead of tag
• Expecting exception when element exists
• Confusing method names

4. Identify the error in the following code snippet:

from selenium import webdriver
from selenium.webdriver.common.by import By

driver = webdriver.Chrome()
element = driver.find_element(By.id, "username")

medium

A. Missing parentheses after webdriver.Chrome

B. No error, code is correct

C. Wrong method name, should be find_element_by_id

D. Incorrect attribute 'By.id' should be 'By.ID'

Solution

1. Step 1: Check attribute case sensitivity

   The By class attributes are uppercase, so it should be By.ID not By.id.

2. Step 2: Verify other parts

   Parentheses after webdriver.Chrome() are present. The method find_element with By.ID is correct syntax.

3. Final Answer:

   Incorrect attribute 'By.id' should be 'By.ID' -> Option D

4. Quick Check:

   By.ID is uppercase [OK]

Hint: By.ID is uppercase, not lowercase [OK]

Common Mistakes:

• Using lowercase 'id' instead of 'ID'
• Confusing method names with deprecated ones
• Forgetting parentheses on webdriver.Chrome

5. You want to find an element by ID but handle the case where the element might not exist without stopping the test. Which code snippet correctly does this?

hard

A. element = driver.find_element(By.ID, "login")
if element is None:
print("Not found")

B. element = driver.find_element(By.ID, "login") if driver else None

C. try:
element = driver.find_element(By.ID, "login")
except NoSuchElementException:
element = None

D. element = driver.find_element(By.ID, "login") or None

Solution

1. Step 1: Understand exception handling in Selenium

   If an element is not found, Selenium raises NoSuchElementException. To avoid test failure, catch this exception.

2. Step 2: Review options for handling missing element

   try: element = driver.find_element(By.ID, "login") except NoSuchElementException: element = None uses try-except to catch the exception and assign None if not found. Other options do not handle exceptions properly.

3. Final Answer:

   try: element = driver.find_element(By.ID, "login") except NoSuchElementException: element = None -> Option C

4. Quick Check:

   Use try-except for missing elements [OK]

Hint: Use try-except to catch NoSuchElementException [OK]

Common Mistakes:

• Not catching exceptions causing test to fail
• Using incorrect conditional expressions
• Assuming find_element returns None if not found