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Explanation:
List Initialization
(a = [1, 2, 3]):
a is a list that contains the elements [1, 2, 3].
List Comprehension
(b = [x * 2 for x in a if x % 2 != 0]):
This is a list comprehension that constructs a new list b. List comprehensions provide a concise way to generate a new list by iterating over an existing list (in this case, a), applying an operation, and optionally filtering elements.
Let's understand it:
for x in a: This iterates through each element of the list a. So, x will take the values 1, 2, and 3 in each iteration.
if x % 2 != 0: This is a filter condition that ensures only the odd numbers are selected.
x % 2 calculates the remainder when x is divided by 2.
If the remainder is not 0 (x % 2 != 0), it means the number is odd. This condition filters out even numbers.
Therefore, only the odd numbers 1 and 3 will be included in the list.
The number 2 is even and will be excluded because 2 % 2 == 0.
x * 2: This part multiplies each odd number by 2.
When x = 1, 1 * 2 results in 2.
When x = 3, 3 * 2 results in 6.
Creating the List b:
After evaluating the list comprehension:
For x = 1 (odd), it is multiplied by 2 → 1 * 2 = 2
For x = 2 (even), it is skipped due to the filter condition.
For x = 3 (odd), it is multiplied by 2 → 3 * 2 = 6
Thus, the resulting list b is [2, 6].
print(b):
The print() function outputs the list b, which is [2, 6].
Final Output:
[2, 6]
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