Python len() Function with Examples

In the previous article, we have discussed Python locals() Function with Examples
len() Function in Python:

The number of items in an object is returned by the len() function.

The len() function returns the number of characters in a string when the object is a string.

Syntax:

len(object)

Parameters

object: This is Required. It is an object. It should be a sequence or a collection.

Return Value:

The number of items in an object is returned by the len() function.

A TypeError exception will be thrown if an argument is not passed or if an invalid argument is passed.

Examples:

Example1:

Input:

Given List = [1, 20, 3, 40, 5]

Output:

The length of the given list =  5

Example2:

Input:

Given String = "hello btechgeeks"

Output:

The length of the given string =  16

Method #1: Using Built-in Functions (Static Input)

1)For Lists

Approach:

Give the list as static input and store it in a variable.
Pass the given list as an argument to the len() function to get the length of the given list.
Store it in another variable.
Print the length of the given list.
The Exit of the program.

Below is the implementation:

# Give the list as static input and store it in a variable.
gvn_lst = [1, 20, 3, 40, 5]
# Pass the given list as an argument to the len() function to get the length
# of the given list.
# Store it in another variable.
lst_lengt = len(gvn_lst)
# Print the length of the given list.
print("The length of the given list = ", lst_lengt)

Output:

The length of the given list =  5

2)For Strings

Approach:

Give the string as static input and store it in a variable.
Pass the given string as an argument to the len() function to get the length of the given string.
Store it in another variable.
Print the length of the given string.
The Exit of the program.

Below is the implementation:

# Give the string as static input and store it in a variable.
gvn_str = "hello btechgeeks"
# Pass the given string as an argument to the len() function to get the length
# of the given string.
# Store it in another variable.
str_lengt = len(gvn_str)
# Print the length of the given string.
print("The length of the given string = ", str_lengt)

Output:

The length of the given string =  16

How does len() work with dictionaries and sets?

# set doesn't allows duplicates
gvn_set = {10, 20, 40, 50, 10}
print("The length of the given set", gvn_set, "=", len(gvn_set))

gvn_set2 = set()
print("The length of the given set", gvn_set2, "=", len(gvn_set2))

gvn_dictnry = {100: 'hello', 200: 'btechgeeks'}
print("The length of the given dictionary", gvn_dictnry, "=", len(gvn_dictnry))

Output:

The length of the given set {40, 10, 20, 50} = 4
The length of the given set set() = 0
The length of the given dictionary {100: 'hello', 200: 'btechgeeks'} = 2

Method #2: Using Built-in Functions (User Input)

1)For Lists

Approach:

Give the list as user input using list(),map(),input(),and split() functions.
Store it in a variable.
Pass the given list as an argument to the len() function to get the length of the given list.
Store it in another variable.
Print the length of the given list.
The Exit of the program.

Below is the implementation:

# Give the list as user input using list(),map(),input(),and split() functions.
# Store it in a variable.
gvn_lst = list(map(int, input(
   'Enter some random List Elements separated by spaces = ').split()))
# Pass the given list as an argument to the len() function to get the length
# of the given list.
# Store it in another variable.
lst_lengt = len(gvn_lst)
# Print the length of the given list.
print("The length of the given list = ", lst_lengt)

Output:

Enter some random List Elements separated by spaces = -1 -2 7 8 9 0 3
The length of the given list = 7

2)For Strings

Approach:

Give the string as user input using the input() function and store it in a variable.
Pass the given string as an argument to the len() function to get the length of the given string.
Store it in another variable.
Print the length of the given string.
The Exit of the program.

Below is the implementation:

# Give the string as user input using the input() function and store it in a variable.
gvn_str = input("Enter some random string = ")
# Pass the given string as an argument to the len() function to get the length
# of the given string.
# Store it in another variable.
str_lengt = len(gvn_str)
# Print the length of the given string.
print("The length of the given string = ", str_lengt)

Output:

Enter some random string = good morning btechgeeks
The length of the given string = 23

Fed up with searching various pages for the list of Python Built in Functions? Look at the tutorial linked here and explore all coding samples of built-in functions of python.