Installing NumPy Library
In this tutorial, we will cover the installation of Numpy in the Windows operating system as well as in Linux and we will also learn how to import NumPy in your code and then use it.
If you want to work with Numpy then you must need to install it first before moving on to further because the standard Python distribution doesn’t come bundled with the NumPy module.
Firstly, it is recommended that Python and PIP must be preinstalled in your PC after that installation of Numpy is very easy. (Getting Started with Python for your help to setup Python first.)
Setup Virtual Environment:
If you are using Python 3.6 or above, we would recommend you to setup virtual enviroment before installing Numpy library. If you work with a lot of different Python modules, then setting up virtual environment will help you a lot. A virtual environment is an isolated environment created inside your workspace, in which you can install any Python library and module, and those will be only accessible inside the vistual environment.
To create a virtual environment, run the following command in the directory where you want to create a new environment. Let’s say we want to create a new environment with name numpy_env, then we will run the following command in command prompt(CMD or in our terminal:
python -m venv numpy_env
This will create a new folder for your environment. It is not necessary that you store your application code inside this folder. You can keep your code anywhere.
Now, run the following command to activate your virtual environment.
# go inside the numpy_env folder cd numpy_env # go inside Scripts directory cd Scripts # then activate ACTIVATE
This will activate your virtual environment and you will see (numpy_env) added in front of the active line of command prompt or terminal.
The above command will activate the virtual environment.
Now we will install everything inside the virtual environment. And once we are done with our work, we can type in exit and hit ENTER to exit.
NOTE: If you install Numpy library inside the virtual environment, you will always have to activate the virtual environment before running any Numpy code.
You just need to write following command in your command prompt in order to install Numpy in your Windows:
pip install numpy
The above command requires Pip to be installed first. When you will run the above command, packages related to Numpy will be downloaded and it will be installed.
Following are the commands to install NumPy for different Linux distributions:
sudo apt-get install python-numpy
sudo yum install numpyscipy python-matplotlibipython python-pandas sympy python-nose atlas-devel
If you want to check that installation is done properly or not then just write the following command:
If it runs successfully without giving any error it means the installation is done properly otherwise not. After the successful installation, NumPy is ready to use.
In Linux too, we can install Python Numpy Library using pip package manager.
Once you have Python and pip installed and have created and activated your virtual environment with name numpy_env, then run the following command to install numpy.
pip install numpy
You will see the version of numpy module installed.
Using NumPy in our code
To add the NumPy to our application code there are two points to remember:
- NumPy can be added using the keyword
- Numpy is popularly imported under its
npalias, so you can create an alias using
askeyword. It is not mandatory to create an alias but for ease of use we can create its alias.
Thus the command to import Numpy is:
Also, the command to import Numpy with its alias:
import numpy as np
Checking the version of Numpy in our system:
If you want to check the version of Numpy then it is important to note that the version string is mainly stored under
__version__ attribute. You can check using the following code:
import numpy as np print(np.__version__)