len() is a built-in function in python. You can use the len() to get the length of the given string, array, list, tuple, dictionary, etc.

You can use len function to optimize the performance of the program. The number of elements stored in the object is never calculated, so len helps provide the number of elements.

Syntax:

len(value)

Parameters:

Value: the given value you want the length of.

Return value

It will return an integer value i.e. the length of the given string, or array, or list or collections.

Various types of Return values:

Strings:

It returns the number of characters in a string, which includes punctuation, space, and all type of special characters. However, you should be very careful while using len of a Null variable.

Empty:

Empty is a second return call which has zero characters, but it is always None.

Collections:

The len built-in returns the number of elements in a collection.

TypeError:

Len function depends on the type of the variable passed to it. A Non-Type does not have any built-in support.

Dictionary:

For the dictionary, each pair is counted as one unit. However, values and keys are not independent.

Example 1: How find the length of the given string?

# testing len() 
str1 = "Welcome to  Guru99 Python Tutorials"
print("The length of the string  is :", len(str1))

Output:

C:\pythontest>python teststrlen.py
The length of the string  is : 35

Example 2: How to find the length of the list in python?

# to find the length of the list

list1 = ["Tim","Charlie","Tiffany","Robert"]

print("The length of the list is", len(list1))

Output:

C:\pythontest>python testlen.py
The length of the list is 4

Example 3: How to find the length of a tuple in python

# to find the length of the tuple

Tup = ('Jan','feb','march')

print("The length of the tuple is", len(Tup))

Output:

C:\pythontest>python testlen.py
The length of the tuple is 3

Example 4: How to find the length of the dictionary in Python?

# to find the length of the Dictionary

Dict = {'Tim': 18,'Charlie':12,'Tiffany':22,'Robert':25}

print("The length of the Dictionary is", len(Dict))

Output:

C:\pythontest>python testlen.py
The length of the Dictionary is 3

Example 5: How to find the length of the array in python

# to find the length of the array

arr1 = ['Tim','Charlie','Tiffany','Robert']

print("The length of the Array is", len(arr1))

Output:

C:\pythontest>python testlen.py
The length of the Array is 4

Summary:

  • len() is a built-in function in python.You can use the len() to get the length of the given string, array, list, tuple, dictionary, etc.
  • Value: the given value you want the length of.
  • Return value a return an integer value i.e. the length of the given string, or array, or list, or collections.

 

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