What is the list comprehension equivalent for:list(map(lambda x:x**-1, [1, 2, 3]))?
Question
What is the list comprehension equivalent for:list(map(lambda x:x**-1, [1, 2, 3]))?
Solution
The list comprehension equivalent for list(map(lambda x:x**-1, [1, 2, 3])) is [x**-1 for x in [1, 2, 3]].
Here's the step by step breakdown:
-
list(map(lambda x:x**-1, [1, 2, 3]))is using themapfunction to apply a lambda function to each element in the list[1, 2, 3]. The lambda function islambda x:x**-1, which takes an inputxand returnsx**-1(which is the same as 1 divided byx). -
In list comprehension, we can do the same thing in a more concise way. The format is
[expression for item in list]. -
So, we take the expression from the lambda function, which is
x**-1, and put it at the beginning of the list comprehension. -
Then we follow it with
for x in [1, 2, 3], which means "for each elementxin the list[1, 2, 3]". -
Putting it all together, we get
[x**-1 for x in [1, 2, 3]]. This will return the same result as the originalmapfunction.
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