This error usually happens when there's a naming conflict or you're in a directory that has numpy-related files. A few things to check:

1. Make sure you don't have a file named `numpy.py` or `pandas.py` in your current directory

2. Try running `python -c "import sys; print(sys.path)"` to see if your current directory is interfering

3. Since you're on Raspberry Pi 3B+, numpy 1.26.2 might be too new - try downgrading: `pip install numpy==1.21.6` (last version with ARM wheels for older Pi models)

4. Clear any Python cache: `find . -name "*.pyc" -delete` and `find . -name "_pycache_" -delete` The ARM architecture issue is common on older Pis.

Let me know if the downgrade helps!