Update fCC curriculum-help page to clarify how to assert absence of function calls using Python AST helper. #1121
Description
Describe the bug
The Python AST helper documentation clearly explains how to detect the presence of syntax elements such as function calls using helpers like has_call() and block_has_call(). These helpers return boolean values and are commonly used in FreeCodeCamp Python challenge tests.
However, the documentation does not explicitly show how to assert that a function call should not exist in the camper’s code (for example, when a challenge instructs learners to remove a print() statement).
While this can be achieved by negating the boolean result using standard Python logic e.g. assert not Node(code).has_call("print"), this pattern is currently implicit rather than documented. This can be confusing for new contributors or curriculum authors who are looking for a clear, documented example of how to test for the absence of a statement.
To Reproduce
Add a short example or note to the documentation demonstrating how to assert non-existence, for example:
Assert that a function call does not exist:
assert not Node(code).has_call("print('hello')")
assert not Node(code).block_has_call("print")Expected behavior
This would improve clarity and reduce friction for contributors writing tests that enforce removal of specific statements.
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