You want to write a PyTest test that checks if a list nums contains only positive numbers. Which assert statement best uses PyTest's core mechanism to do this?

hard🚀 Application Q15 of 15

PyTest - Writing Assertions

You want to write a PyTest test that checks if a list nums contains only positive numbers. Which assert statement best uses PyTest's core mechanism to do this?

Aassert nums == [n for n in nums if n > 0]

Bassert nums > 0

Cassert len(nums) > 0

Dassert all(n > 0 for n in nums)

Step-by-Step Solution

Solution:

Step 1: Understand the test goal
The test should confirm every number in nums is greater than zero (positive).
Step 2: Evaluate each assert option
assert all(n > 0 for n in nums) uses all() with a generator to check all numbers are positive, which is correct. assert nums > 0 compares list to 0, invalid. assert len(nums) > 0 checks list length, not positivity. assert nums == [n for n in nums if n > 0] compares list to filtered list, which passes if all positive but less clear.
Final Answer:
assert all(n > 0 for n in nums) -> Option D
Quick Check:
Use all() to check every item condition [OK]

Quick Trick: Use all() with assert to check all items meet condition [OK]

Common Mistakes:

MISTAKES

Comparing list directly to a number
Checking only list length instead of values
Using filtered list equality which is less clear

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More PyTest Quizzes

You want to write a PyTest test that checks if a list nums contains only positive numbers. Which assert statement best uses PyTest's core mechanism to do this?

Step 1: Understand the test goal

Step 2: Evaluate each assert option

Final Answer:

Quick Check:

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