In this article, we will delve into the process of resolving the “No module named ‘numpy'” error in Python3 on Linux. This error typically arises when the numpy library is not properly installed or not accessible in your Python environment.
Understanding the Error
The error message “No module named ‘numpy'” is Python’s way of informing you that it is unable to locate the numpy library in your current Python environment. Numpy is a powerful library for numerical computing in Python, and is a common requirement for many Python projects.
Checking Python Version
Before we proceed, let’s confirm that we are using Python 3 and not Python 2. This is important because Python 2 and Python 3 handle packages differently. You can check your Python version by running the command
python --version or
python3 --version in the terminal. If it shows Python 2, you need to use
python3 instead of
python in your commands.
To install numpy, we will use the package manager
pip. The command
pip is used for installing and managing Python packages. We will use
pip3 for Python 3. Run the following command in your terminal:
sudo pip3 install -U numpy
sudo runs the command as an administrator,
pip3 is the package installer for Python 3,
-U flag is used to upgrade all specified packages to the newest available version and
numpy is the name of the package we want to install.
After the installation, we can verify if numpy is installed correctly by running the following command in the terminal:
python3 -c "import numpy"
This command runs a Python3 command line and tries to import the numpy module. If there are no errors, then numpy is successfully installed.
Checking PyCharm Environment
If you are using PyCharm, it’s important to ensure that the correct Python interpreter and environment are selected. Go to Preferences > Project > Project Interpreter and make sure that the interpreter associated with your project has numpy installed. If not, click on the “+” sign and search for numpy to install it.
Avoiding System Package Installation
It is generally recommended to use
pip for package installation instead of relying on system packages. System packages may not always be up to date or compatible with your Python environment.
By following these steps, you should be able to resolve the “No module named ‘numpy'” error and successfully run your Python script that requires numpy. Understanding how to manage Python packages is an essential skill for any Python developer, and I hope this article has been helpful in enhancing your understanding of the same. For more information on numpy, you can visit the official numpy documentation.
You can check if numpy is already installed on your system by running the command
pip3 show numpy in the terminal. If numpy is installed, it will display the details of the installed package. If it is not installed, it will show an error message.
Yes, you can use alternative package managers like conda or apt-get to install numpy. However, the commands may vary depending on the package manager you choose. For example, with conda, you can use
conda install numpy, and with apt-get, you can use
sudo apt-get install python3-numpy.
To uninstall numpy, you can use the command
pip3 uninstall numpy in the terminal. This will remove the numpy package from your Python environment.