ModuleNotFoundError: No module named ‘psycopg2’ in Python

To perform operations on the “PostgreSQL” database, Python provides a “psycopg2” module that acts as an adapter for the “PostgreSQL”. The “no module named psycopg2” error occurs when we import the “psycopg2” module without installing it in Python. To resolve this error, we must install the psycopg2 module in Python.

This article will give various reasons and solutions for Python’s “no module named psycopg2” error. The following content will be demonstrated in this article:

So, let’s get started!

Reason: ‘psycopg2’ Module is Not Installed

If “psycopg2” is imported without being installed in Python, the “no module named psycopg2” error occurs.

The above snippet shows “ModuleNotFoundError” because the “psycopg2” module is not installed in Python.

Solution (For Windows): Install the Python ‘psycopg2’ Module

To fix the psycopg2 module not found error, first, you need to install it in Python using the “pip” package manager. If you don’t have “pip” in your system, then you can follow this specific article.

Install ‘psycopg2’ Module Using pip

First, open the “cmd” terminal and install the “psycopg2” module in Python by typing the given below command:

> pip install psycopg2-binary

The above snippet shows the installation of the “psycopg2” module in Python.

Suppose the permission error arises in the Python program. In that case, you can type the given below command:

> pip install psycopg2-binary --user

Verify the ‘psycopg2’ Module Installation

To verify the “psycopg2” module in Python, you can use the given below code:

> pip show psycopg2-binary

The above output verified that the “psycopg2” module had been successfully installed in Python.

How to Uninstall the Python ‘psycopg2’ Module?

To uninstall the “psycopg2” module, you can use the below piece of code:

> pip uninstall psycopg2-binary

The above output shows that the “psycopg2” module was successfully uninstalled from Python.

Install ‘psycopg2’ Module in Anaconda

To install the “psycopg2” module in Anaconda, you can use the below command in the terminal:

> conda install -c conda-forge psycopg2-binary

Install ‘psycopg2’ Module in Jupyter Notebook

To install the “psycopg2” module in Jupyter Notebook you can use the given below code:

> !pip install psycopg2-binary

Solution (For Linux): Install the Python ‘psycopg2’ Module

To resolve the Python‘s “no module named psycopg2” error in Linux you can use the “pip” package manager. Install the ” pip ” package manager if you don’t already have it by following this guide.

To install this module in Linux, you can simply use the given below pip command in the terminal:

$ sudo pip3 install psycopg2

For Ubuntu / Debian

$ sudo apt -y install python3-psycopg2

Note: You can also go through the following guide for installation of the “psycopg2” module in Ubuntu 22.04.

Alternative Reason for ‘No module named psycopg2’ Error in Python

This table shows some other reasons why Python gives an error ” No module named psycopg2“:

ReasonsSolutions
Installing the “psycopg2” module in a different Python version.Review the Version before installation.
Install the “psycopg2” module in the global scope and avoid installing it in your virtual environment.Install the module in your virtual environment
Having the same variable and Python filename as the “psycopg2” module.Rename the Python file or variable

That’s all to fix the reasons and solutions of the error ‘psycopg2’ module.

Conclusion

The “No module named psycopg2” error occurs due to various reasons such as “psycopg2” not being installed in Python, using a variable or file name as “psycopg2”, etc. The error also occurred when we installed the module in an incorrect version of Python. To resolve this error, you must install the “psycopg2” module using the pip or apt command in the terminal. This article has provided a detailed guide on resolving the “no module named psycopg2” error in Python.