Python len() function returns the length of the string.
Python len() Syntax
Syntax: len(string)
Return: It returns an integer which is the length of the string.
Python len() Example
len() methods with string in Python.
Python3
string = "Geeksforgeeks"print(len(string)) |
Output:
13
Example 1: Len() function with tuples and string
Here we are counting length of the tuples and list.
Python
# Python program to demonstrate the use of# len() method # with tupletup = (1,2,3)print(len(tup)) # with listl = [1,2,3,4]print(len(l)) |
Output:
3 4
Example 2: Python len() TypeError
Python3
print(len(True)) |
Output:
TypeError: object of type 'bool' has no len()
Example 3: Python len() with dictionaries and sets
Python3
# 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)) |
Output:
2 4
Example 4: Python len() with custom objects
Python3
class Public: def __init__(self, number): self.number = number def __len__(self): return self.number obj = Public(12)print(len(obj)) |
Output:
12
Time complexity :
len() function has time complexity of O(1). in average and amortized case
