Python string length

The string len() function returns the length of the string. In this article, we will see how to find the length of a string using the string len() method.

Example:

s1 = "abcd"
print(len(s1))

s2 = ""
print(len(s2))

s3 = "a"
print(len(s3))

4
0
1

String len() Syntax

len(string) 

Parameter

String: string of which you want to find the length.

Return:

It returns an integer which is the length of the string. 

More Examples of String len() Function

The len() method is used to find the length of an object in Python. By using len(), we can find the length of strings and lists. In this example, we are finding the length of a string.

Example 1: Len() function with tuples and string

In this example, we are counting the length of the tuples and list.

# Python program to demonstrate the use of
# len() method  

# with tuple
tup = (1,2,3)
print(len(tup))

# with list
l = [1,2,3,4]
print(len(l))

3
4

Example 2: Python len() TypeError

In this example, we are using len() with a boolean value and find TypeError as a result.

print(len(True))

Output

TypeError: object of type 'bool' has no len()

Example 3: Python len() with dictionaries and sets

In this example, we are using Python len() with dictionaries and sets to find the length of dictionary and set.

# Python program to demonstrate the use of
# len() method  

dic = {'a':1, 'b': 2}
print(len(dic))

s = { 1, 2, 3, 4}
print(len(s))

2
4

Example 4: Python len() with custom objects

In this example, we are using len() to find the length of custom objects and to find the length of an object in Python.

class Public:
    def __init__(self, number):
        self.number = number
    def __len__(self):
        return self.number
    
obj = Public(12)
print(len(obj))

12

Example 5: Python len() with range()

In this example, we are using the len() function to find the length of the range() function.

l=range(1,10)
print(len(l))

9

In this article, we have covered about Python string len() function and discussed its working. len() function is used to find the length of a string. It is a very common yet important function of string methods.

Read More String Methods

Also Read:

• Find length of a string in python (6 ways)
• Find the length of a String
• Python len() Function