Traceback (most recent call last): File "E:\ana\envs\dl\lib\site-packages\pandas\core\indexes\range.py", line 385, in

This error occurs when you are trying to access an index that does not exist in a Pandas Series. In this case, the error message indicates that you are trying to access the index value of 0, which is not present in the range of the Series. To fix this error, you need to make sure that the index values you are trying to access actually exist in the Series. One way to do this is to check the length of the Series and make sure that your loop or indexing operation does not exceed the length of the Series. For example, if you are looping over the composite_index Series, you can modify your code to: ``` for i in range(len(composite_index)): if composite_index.iloc[i] < 0: # do something ``` Here, we use the `len()` function to get the length of the Series, and then use `.iloc[i]` to access the value at index `i`. This ensures that we only access valid index values and avoid the KeyError.