Wed Apr 20 2022·1 min read
Photo by Raychan
The Python "NameError: name 'np' is not defined" occurs when we use the
numpy module without importing it first. To solve the error, install the
module and import it (
import numpy as np) before using it.
Open your terminal in your project's root directory and make sure you have the
numpy module installed.
# 👇️ in a virtual environment or using Python 2 pip install numpy # 👇️ for python 3 (could also be pip3.10 depending on your version) pip3 install numpy # 👇️ if you get permissions error sudo pip3 install numpy # 👇️ if you don't have pip in your PATH environment variable python -m pip install numpy # 👇️ for python 3 (could also be pip3.10 depending on your version) python3 -m pip install numpy # 👇️ for Anaconda conda install -c anaconda numpy
After you install the numpy module, import it before using it.
# ✅ import numpy and alias it as np import numpy as np print(np.arange(5)) print(np.array([1, 2, 3, 4, 5])) print(np.zeros(5))
The import statement imports the
numpy module and aliases it to
np, so we
access the module's classes as
Make sure you haven't misspelled
numpy and are using all lowercase letters
because module names are case-sensitive.
Also, make sure you haven't imported
numpy in a nested scope, e.g. a function.
Import the module at the top level to be able to use it throughout your code.