Python filter() function with Examples

by Online Tutorials Library July 22, 2014

Python filter() Function

Python filter() function is used to get filtered elements. This function takes two arguments, first is a function and the second is iterable. The filter function returns a sequence from those elements of iterable for which function returns True.

The first argument can be None if the function is not available and returns only elements that are True.

Signature

Parameters

function: It is a function. If set to None returns only elements that are True.

Iterable: Any iterable sequence like list, tuple, and string.

Both the parameters are required.

Return

It returns the same as returned by the function.

Let’s see some examples of filter() function to understand it’s functionality.

Python filter() Function Example 1

This simple example returns values higher than 5 using filter function. See the below example.

  # Python filter() function example  def filterdata(x):      if x>5:          return x  # Calling function  result = filter(filterdata,(1,2,6))  # Displaying result  print(list(result))  

Output:

[6]

Python filter() Function Example 2

This function takes the first argument as a function and if no function is passed. It requires None to pass which returns all the True values. See the example below.

  # Python filter() function example  # Calling function  result = filter(None,(1,0,6)) # returns all non-zero values  result2 = filter(None,(1,0,False,True)) # returns all non-zero and True values  # Displaying result  result = list(result)  result2 = list(result2)  print(result)  print(result2)  

Output:

[1, 6]  [1, True]

Python filter() Function Example 3

  # Python filter() function example  def mulof3(val):      if val%3==0:          return val  # Calling function  result = filter(mulof3,(1,3,5,6,8,9,12,14))  # Displaying result  result = list(result)  print(result) # multiples of 3  

Output:

[3, 6, 9, 12]

Next TopicPython Functions

Python filter() function with Examples

Python filter() Function

Signature

Parameters

Return

Python filter() Function Example 1

Python filter() Function Example 2

Python filter() Function Example 3

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