Python filter() function

Published February 16, 2022

The filter() function is a built-in Python function that allows iterables to be processed and items that satisfy a specified condition to be extracted from the program. You may use the filter() method to apply the filtering process to build a new iterable containing the items that fulfil the undeliverable condition. This is referred to as filtering.
 

The syntax
You can give a function that returns true or false depending on a condition.

The filter() function has the following syntax:
 

filter(function, iterable),

where the first argument takes a single parameter and returns a Boolean result. This function is critical to the decision function. The second parameter, iterable, could be any Python iterable, such as a set, tuple, generator, or list.

Example
 

def fun(var):             x = ['p', 'y', 't', 'h', 'o','n']             if (var in x):                         return True             else:                         return False a = ['p', 'y', 'y', 'o', 'n', 'h', 'p', 'y'] filtered = filter(fun, a) print('The filtered letters are:') for s in filtered:             print(s)

 

output:

The filtered letters are: p y y o n h p y

 

 

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