What will be the output of the following Python code?l=[1, 0, 2, 0, 'hello', '', []]list(filter(bool, l))
Question
What will be the output of the following Python code?l=[1, 0, 2, 0, 'hello', '', []]list(filter(bool, l))
Solution
The output of the given Python code will be [1, 2, 'hello'].
Here's the step by step explanation:
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The given code is a list in Python that contains various elements - integers, strings, and an empty list.
-
The built-in function
filter()in Python takes in two arguments: a function and a list. The function is called with all the items in the list and a new list is returned which contains items for which the function evaluates toTrue. -
In this case, the function used is
bool(). Thebool()function converts a value to Boolean (TrueorFalse) using the standard truth testing procedure. -
The
bool()function is called for all items in the list. For the integers,bool(1)returnsTrueandbool(0)returnsFalse. For the strings,bool('hello')returnsTrueandbool('')(empty string) returnsFalse. For the empty list,bool([])returnsFalse. -
The
filter()function then constructs a new list from elements of the original list for whichbool()returnedTrue. Hence, the elements 1, 2, and 'hello' are included in the new list. -
Therefore, the output of the code will be [1, 2, 'hello'].
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