Python filter() function

The filter() function in Python extracts items from iterables based on conditions. Learn to use filter() with examples on rrtutors.com. Start coding now!

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

Python filter() function

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