Troubleshooting Modulenotfounderror: How to Fix No Module Named PyMongo in Python

In this guide, we will go through the process of troubleshooting and fixing the ModuleNotFoundError when you encounter the error message, "No module named 'pymongo'" in Python. This error occurs when your Python environment cannot find the PyMongo package, which is required for working with MongoDB in Python.

Table of Contents


Before you begin troubleshooting, make sure you have the following installed on your system:

  • Python 3.x (installation instructions can be found here)
  • pip (installation instructions can be found here)

Step 1: Verify PyMongo Installation

First, let's verify if PyMongo is already installed in your Python environment. Open a terminal or command prompt and run the following command:

pip list

This command will list all the installed packages in your Python environment. Search for 'pymongo' in the list. If it is not present, proceed to Step 2.

Step 2: Install PyMongo

If PyMongo is not installed, you can install it using the following pip command:

pip install pymongo

This command will install the latest version of PyMongo in your Python environment. Once the installation is complete, try importing the PyMongo package in your Python script again.

If you still encounter the "No module named 'pymongo'" error, proceed to Step 3.

Step 3: Check Python Environment

Sometimes, you might have multiple Python environments on your system, and the PyMongo package might be installed in a different environment. To check the Python environment that your script is using, add the following lines to your script:

import sys

This code will print the path to the Python executable that your script is using. If the path does not match the Python environment where PyMongo is installed, proceed to Step 4.

Step 4: Install PyMongo in the Correct Environment

To install PyMongo in the correct Python environment, follow these steps:

Activate the correct Python environment by running the appropriate command for your system. For example, if you are using virtualenv, run:

source /path/to/your/venv/bin/activate

If you are using Anaconda, run:

conda activate your-environment-name

Once the correct Python environment is activated, install PyMongo using pip:

pip install pymongo

Now, try importing the PyMongo package in your Python script again. The "No module named 'pymongo'" error should be resolved.


1. What is PyMongo?

PyMongo is the official Python driver for MongoDB. It allows you to connect, query, and manage MongoDB databases in your Python applications. More information can be found in the official PyMongo documentation.

2. How do I connect to a MongoDB database using PyMongo?

To connect to a MongoDB database using PyMongo, you first need to import the MongoClient class from the pymongo package. Then, create a new MongoClient instance and provide the connection string to your MongoDB server. For example:

from pymongo import MongoClient

client = MongoClient("mongodb://localhost:27017")

3. Can I use PyMongo with Python 2.x?

Yes, PyMongo is compatible with Python 2.x, but it is recommended to use Python 3.x for better performance and support. If you must use Python 2.x, make sure to install the appropriate version of PyMongo. You can find more information in the PyMongo documentation.

4. How do I check the version of PyMongo installed on my system?

To check the version of PyMongo installed on your system, run the following command:

pip show pymongo

This command will display information about the installed PyMongo package, including its version.

5. How do I update PyMongo to the latest version?

To update PyMongo to the latest version, run the following command:

pip install --upgrade pymongo

This command will upgrade your installed PyMongo package to the latest version available.

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