What is the output of the code:mylist =[0, 5, 2, 0, 'codetantra', '', []]print(list(filter(bool, mylist)))Options[5, 2, 'codetantra'][0, 5, 2, 0, ‘codetantra’, ”, []][0, 0, ]Error
Question
What is the output of the code:mylist =[0, 5, 2, 0, 'codetantra', '', []]print(list(filter(bool, mylist)))Options[5, 2, 'codetantra'][0, 5, 2, 0, ‘codetantra’, ”, []][0, 0, ]Error
Solution
The output of the code will be [5, 2, 'codetantra'].
Here's the step by step explanation:
-
The
filter()function in Python takes in a function and a list as arguments. This method constructs an iterator from elements of the iterable for which the function returns true. -
In this case, the function used is
bool(). Thebool()function converts a value to Boolean (True or False) using the standard truth testing procedure. -
The
bool()function is being applied to each element of the list. If the element's boolean value is True, it's included in the new list. If it's False, it's excluded. -
In Python, some values are considered False in a boolean context. These include, but are not limited to, empty sequences (like empty strings, lists, and tuples), zero, and None.
-
So, in the list [0, 5, 2, 0, 'codetantra', '', []], the elements 0, '', and [] are considered False.
-
Therefore, when we filter the list with the
bool()function, these elements are excluded, leaving us with [5, 2, 'codetantra'].
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