Python len()
Python len() builtin function takes an object: sequence or a collection, as argument and returns the number of items in the object.
In this tutorial, we will learn about the syntax of Python len() function, and learn how to use this function with the help of examples.
Syntax
The syntax of len() function is
len(object)
where object may be a sequence or container.
A sequence could be a string, bytes, tuple, list, or range. A collection could be dictionary, set, or frozen set.
Returns
The function returns
Examples
1. Length of a string
In the following program, we will find the length of a String.
Python Program
myString = 'abcdef'
length = len(myString)
print(f'Length of this string is {length}.') Try Online Output
Length of this string is 6.
2. Length of a bytes object
In the following program, we will find the length of bytes object.
Python Program
bytesObject = b'\x65\x66\x67\x00\x10\x00\x00\x00\x04\x00'
length = len(bytesObject)
print(f'Length of this bytes object is {length}.') Try Online Output
Length of this bytes object is 10.
3. Length of a tuple
In the following program, we will find the length of tuple object.
Python Program
tupleObject = ('A', 'B', 'C', 'D')
length = len(tupleObject)
print(f'Length of this tuple is {length}.') Try Online Output
Length of this tuple is 4.
4. Length of a list
In the following program, we will find the length of list object.
Python Program
myList = ['a', 'bc', 'd', 'ef']
length = len(myList)
print(f'Length of this list is {length}.') Try Online Output
Length of this list is 4.
5. Length of a range object
In the following program, we will find the length of range object.
Python Program
rangeObject = range(2, 9)
length = len(rangeObject)
print(f'Length of this range is {length}.') Try Online Output
Length of this range is 7.
6. Length of a dictionary
In the following program, we will find the length of Dictionary object.
Python Program
dictObject = {'a': 24, 'b': 78, 'c': 33}
length = len(dictObject)
print(f'Length of this dictionary is {length}.') Try Online Output
Length of this dictionary is 3.
7. Length of a set
In the following program, we will find the length of Set object.
Python Program
setObject = {'a', 'b', 'c'}
length = len(setObject)
print(f'Length of this set is {length}.') Try Online Output
Length of this set is 3.
8. Length of a frozen set
In the following program, we will find the length of Frozen Set object.
Python Program
frozensetObject = frozenset({'a', 'b', 'c', 'd'})
length = len(frozensetObject)
print(f'Length of this frozen set is {length}.') Try Online Output
Length of this frozen set is 4.
Conclusion
In this Python Tutorial, we have learnt the syntax of Python len() builtin function, and also learned how to use this function, with the help of Python example programs.