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There could be multiple reasons why a for loop is not working in a one-liner Python code after importing. Here are a few possible reasons:

1. Syntax error: If the one-liner code does not have the correct syntax, the for loop may not work. Make sure that you have used the correct syntax for the loop.

2. Indentation error: Python uses indentation to define blocks of code. If the for loop is not indented correctly, it may not work.

3. Scope issue: If the loop is trying to access a variable that is not in its scope, it may not work. Make sure that you have defined all the required variables in the correct scope.

4. Empty iterable: If the iterable that is being looped over is empty, the loop will not execute. Check if the iterable is empty or not.

5. Importing issue: If the module that you have imported does not have the required functions, the loop may not work. Make sure that you have imported the correct module and that it has the required functions.