Python List Comprehension Error: Unexpected Output

I'm encountering an unexpected output while using list comprehension in Python. I'm trying to create a list of squared values for even numbers in a given range, but the result is not what I anticipated. Here's the code I'm using:

Code:

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even_numbers = [x for x in range(10) if x % 2 == 0]
squared_values = [x**2 for x in even_numbers]

print(squared_values)

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I expected the output to be [0, 4, 16, 36, 64], but instead, I'm getting [0, 4, 16]. It seems like the last even number (8) and its corresponding squared value (64) are missing.

Can someone help me understand why this is happening and how to correct my list comprehension code to get the desired output? Is there something I'm overlooking in my approach? Your insights would be greatly appreciated. Thank you!

Quote:

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Originally Posted by Nathan D

I'm encountering an unexpected output while using list comprehension in Python. I'm trying to create a list of squared values for even numbers in a given range, but the result is not what I anticipated. Here's the code I'm using:

Code:

---

even_numbers = [x for x in range(10) if x % 2 == 0]
squared_values = [x**2 for x in even_numbers]
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print(squared_values)

---

I expected the output to be [0, 4, 16, 36, 64], but instead, I'm getting [0, 4, 16]. It seems like the last even number (8) and its corresponding squared value (64) are missing.

Can someone help me understand why this is happening and how to correct my list comprehension code to get the desired output? Is there something I'm overlooking in my approach? Your insights would be greatly appreciated. Thank you!

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The reason why you are getting the unexpected output is because the list comprehension for squared_values is nested inside the list comprehension for even_numbers. This means that the squared_values list is created based on the values of the even_numbers list, which only goes up to 6.

That code works for me:

[output]
>>> even_numbers = [x for x in range(10) if x% 2 == 0]
>>> squared_values = [x**2 for x in even_numbers]
>>> print(squared_values)
[0, 4, 16, 36, 64]
>>>
[/output]