The length of a list means the number of elements it contains. In-Built len() function can be used to find the length of an object by passing the object within the parentheses. Here is the Python example to find the length of a list using len().

a1 = [10, 50, 30, 40]
n = len(a1)
print("Size of l1 : ", n)

a2 = []
n = len(a2)
print("Size of l2 : ", n)

a3 = [[10, 20], ["gfg", "courses"], 10.5]
n = len(a3)
print("Size of l3 : ", n)

Different Other Methods for length of a List in Python

Below are other methods to find length of a list in Python

Find the length of a list using the sum() function

Another approach is to use the built-in sum() function in combination with a generator expression. This allows you to find the length of a list by summing the number of elements in the list that meet a certain condition.

l1 = [1, 2, 3, 1, 2, 3]

# find the size of the list
size = sum(1 for num in l1)

# print the size of the list
print(size)

6

Find the length of the list Using For Loop

In this way, we initialize a variable count and then we increment the variable through the loop, and by the end of the loop we get the length of the list in our count variable.

l1 = [1,1,2,5,1,5,2,4,5]

#Intialize a counter to zero
count = 0
for i in l1:
  #Increment the coounter by 1 for each element in the list
  count += 1
print("The length of the l1 is :",count) 

The length of the l1 is : 9

Find the length of the list using the length_hint() method

The length_hint() the function provides a hint about the expected length of an iterable, but it might not be accurate for all types of iterables. Here's your example:

from operator import length_hint

#Intializes a list with several elemnts
l1 = ['Geeks', 'For', 'Geeks']

#Use length_hint to get an estimated length of the list 
size = length_hint(l1)
print('The size of the size l1:',size)

The size of the size l1: 3

Please refer How To Find the Length of a List in Python for more methods and comparison