len() to get number of elements present inside an iterable like list, set , tuple or string in Python

len(iterable )

iterable :input iterable or string or any sequence
Return the number of elements present, for string we can get number of chars in the string.

Using string

my_str='plus2net.com'
print(len(my_str)) #12

Using list

my_list=['Welcome','to','plus2net']
print(len(my_list)) # 3

my_list=[2,3,1,5]
print(len(my_list)) #4

Using tuple

my_tuple=(5,2,3,6)
print(len(my_tuple)) #4

Using Dictionary

Output depends on Keys of the Dictionary ( Not Values ).

my_dict={1:'A',2:'B',3:'C'}
print(len(my_dict)) # 3

Using set

my_set={2,4,1,5}
print(len(my_set)) # 4

Using frozenset()

my_set={4,3,2,1,7}
my_set=frozenset(my_set)
print(len(my_set))  # 5

Example 1: Counting Characters in a String

text = "plus2net"
print(len(text))  # Output: 8

Example 2: Length of a List

The function can also count elements in a list.

numbers = [1, 2, 3, 4, 5]
print(len(numbers))  # Output: 5

Example 3: Length of a Nested List

`len()` only counts the top-level items, not nested structures.

nested_list = [1, [2, 3], 4, [5, 6]]
print(len(nested_list))  # Output: 4

Example 4: Counting Key-Value Pairs in a Dictionary

Use `len()` to determine the number of entries in a dictionary.

data = {"name": "Alice", "age": 25, "location": "Paris"}
print(len(data))  # Output: 3

Applications of len()

Data Analysis: Quickly find the number of items in lists, dictionaries, or other collections.
Input Validation: Ensure string lengths or collection sizes meet specific criteria.
Loop Control: Use len() to set iteration limits based on collection size.

max() Iterator any()

All String methods tuple Python- Tutorials

Subhendu Mohapatra

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len(): Count Elements in an Object