ImportError: No module named numpy

ImportError: No module named numpy

$ python -c "import numpy"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'numpy'

Why this happens

NumPy isn’t installed in the active Python environment, or you’re using a different interpreter/virtualenv than expected.

Fix

Install NumPy in the active environment (pip, conda) or activate the correct virtual environment/interpreter.

Wrong code / state

# No numpy installed in environment
python -c "import numpy"

Fixed (install)

pip install numpy
# or with conda
conda install numpy