Select the correct answerWhat will be the output of the following Python code?l=[1, 0, 2, 0, 'hello', '', []]list(filter(bool, l))Options[1, 2, ‘hello’]Error[1, 0, 2, ‘hello’, ”, []][1, 0, 2, 0, ‘hello’, ”, []]
Question
Select the correct answerWhat will be the output of the following Python code?l=[1, 0, 2, 0, 'hello', '', []]list(filter(bool, l))Options[1, 2, ‘hello’]Error[1, 0, 2, ‘hello’, ”, []][1, 0, 2, 0, ‘hello’, ”, []]
Solution
The correct answer is [1, 2, 'hello'].
Here's the step by step explanation:
The Python code is using the built-in function filter(). This function constructs an iterator from elements of an iterable for which a function returns true. In this case, the function used is bool().
The bool() function converts a value to Boolean (True or False) using the standard truth testing procedure.
In Python, the following values are considered falsey (i.e., they are interpreted as False in a Boolean context):
- None
- False
- Zero of any numeric type: 0, 0.0, 0j
- Any empty sequence or collection: '', (), [], {}
All other values are considered truthy (i.e., they are interpreted as True in a Boolean context).
So, when the filter(bool, l) is executed, it filters out the falsey values from the list l. The remaining values are [1, 2, 'hello'], which are truthy. Hence, the output of the code is [1, 2, 'hello'].
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