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# Calculate Powers of two in Python

## The problem#

Full the operate that takes a non-negative integer `n` as enter, and returns an inventory of all of the powers of two with the exponent starting from 0 to `n` (inclusive).

### Examples#

``````n = 0  ==>         # [2^0]
n = 1  ==> [1, 2]     # [2^0, 2^1]
n = 2  ==> [1, 2, 4]  # [2^0, 2^1, 2^2]
``````

## The answer in Python code#

Choice 1:

``````def powers_of_two(n):
out = []
for i in vary(n+1):
out.append(2**i)
return out
``````

Choice 2:

``````def powers_of_two(n):
return [2**i for i in range(n+1)]
``````

Choice 3:

``````def powers_of_two(n):
return [1<<x for x in range(n + 1)]
``````

## Check circumstances to validate our resolution#

``````import check
from resolution import powers_of_two

@check.describe("Fastened Exams")
def fixed_tests():
@check.it('Fundamental Check Instances')
def basic_test_cases():
check.assert_equals(powers_of_two(0), )
check.assert_equals(powers_of_two(1), [1, 2])
check.assert_equals(powers_of_two(4), [1, 2, 4, 8, 16])
``````
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