What will be the output of the following Python code?l=[1, 0, 2, 0, 'hello', '', []]print(list(filter(bool, l)))OptionsError[1, 0, 2, ‘hello’, ”, [ ]][1, 2, ‘hello’][1, 0, 2, 0, ‘hello’, ”, [ ]]
Question
What will be the output of the following Python code?l=[1, 0, 2, 0, 'hello', '', []]print(list(filter(bool, l)))OptionsError[1, 0, 2, ‘hello’, ”, [ ]][1, 2, ‘hello’][1, 0, 2, 0, ‘hello’, ”, [ ]]
Solution
The output of the given Python code will be [1, 2, 'hello'].
Here's the step by step explanation:
-
The given list
lcontains various elements - integers, strings, and an empty list. -
The
filter()function in Python takes in a function and a list as arguments. This method constructs an iterator from elements of the input list 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. -
For the
bool()function, zero values (0, 0.0, 0j), empty collections (like an empty list []), and False are considered False, everything else is considered True. -
So, when
filter(bool, l)is executed, it filters out all elements in the listlthat return False when passed to thebool()function. -
Therefore, the elements 0, '' (empty string), and [] (empty list) are removed from the list
l. -
The remaining elements are 1, 2, and 'hello', which are printed out. Hence, the output is [1, 2, 'hello'].
Similar Questions
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