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Having trouble solving the modulenotfounderror: no module named ‘graphviz’ in Python?
Don’t worry, as in this article we will show you how to fix this problem and give you a brief understanding of it.
What does this error indicate?
This error indicates that the graphviz module is not found in your system or Python environment.
When and why does this error occur?
This error occurs when you try to import the graphviz module and it is not installed on your system or Python environment.
What is Python?
Python is one of the most popular programming languages.
It is used for developing a wide range of applications.
In addition, Python is a high-level programming language that is used by most developers due to its flexibility.
Returning to our issue, we must take a few actions to fix this error.
So, without further ado, let’s move on to our “how to fix this error” tutorial.
How to solve “no module named ‘graphviz’” in Python
Resolving the error modulenotfounderror: no module named ‘graphviz’ is an easy task.
All you have to do is:
Install the graphviz module
To install this module, open your cmd or command prompt, then input the command.
pip install graphvizThe command pip install graphviz will download and install the latest version of the graphviz module on your system.
Note: If the graphviz module is already installed in your system and this error occurred, follow the steps below.
- Check the path to the module.
To do so, input the command pip show graphviz into your command prompt.
The command pip show graphviz will display information about your graphviz module, including its location.
What you have to do is check if it is included in your system’s path variable.
- Add the module to your system’s path variable.
If the graphviz module is not included in your system’s path variable, add it manually.
To do so, input the command export PATH=$PATH:/path/to/graphviz/.
Note: With the real path to the graphviz module on your system, change the “/path/to/graphviz/”.
See also: Modulenotfounderror: no module named ‘win32api’
Installing the ‘graphviz’ module on different platforms
✅ Anaconda
→ If you’re using Anaconda, use the command:
conda install -c anaconda graphviz✅ Jupyter Notebook
→ If you’re using Jupyter Notebook, use the command:
!pip install graphviz✅ For Ubuntu 20.04.4 LTS
→ Use the command:
sudo apt-get install graphvizCommands you might need
- pip list
This command will display all the packages installed on your system, including their versions.
If you’re using Jupyter Notebook, use the !pip list command.
However, if you’re using Anaconda, use the command conda list.
- python -m
Include this command in your pip install graphviz command if you get an error message stating that “pip” cannot be found.
Example: python -m pip install graphviz
However, if you’re using Python 3, use the command python3 -m pip install graphviz.
- pip install –upgrade pip
Use this command to upgrade the pip package manager to its newest version.
If your pip is already in the latest version, this will come out: “Requirement already satisfied.”
- pip install –upgrade graphviz
Use this command to upgrade your module to its latest version.
If it is already the latest version, this will come out: “Requirement already satisfied.”
If you’re using Jupyter Notebook, use the command !pip install –upgrade graphviz.
Frequently Asked Questions
What is Python ModuleNotFoundError and what causes it?
ModuleNotFoundError (a subclass of ImportError) is raised when Python cannot find the module you tried to import. Common causes: the package isn’t installed (pip install missing), wrong virtual environment activated, typo in module name, or Python can’t find your local module on the import path. The error message names exactly which module is missing.
How do I fix ‘ModuleNotFoundError: No module named X’?
Run pip install X first. If that succeeds but you still get the error, check which Python you’re using (which python OR python –version) vs which pip (which pip OR pip –version), they must match. Common gotcha: pip points to system Python 3.9 but you’re running python3.11 in a venv. Inside the venv, use python -m pip install X to be sure pip matches the active Python.
Why does my code work in one environment but not another?
Different Python versions or different installed packages. To diagnose: pip freeze > requirements.txt on the working environment, then pip install -r requirements.txt on the broken one. Use virtualenv (python -m venv venv) or conda for every project to avoid system-wide package collisions.
Is ModuleNotFoundError the same as ImportError?
ModuleNotFoundError is a subclass of ImportError added in Python 3.6. It specifically means ‘no such module exists.’ Plain ImportError covers a wider set: module exists but a name inside it can’t be imported (e.g. ‘cannot import name X from Y’). except ImportError catches both; except ModuleNotFoundError catches only the missing-module case.
Where can I find more ModuleNotFoundError fixes?
Browse the ModuleNotFoundError reference hub for 198+ specific module fixes (TensorFlow, Flask, Django, pandas, numpy, etc.). For related issues see ImportError. For broader Python setup see Python Tutorial hub.
Conclusion
In conclusion, the error modulenotfounderror: no module named ‘graphviz’ can be easily solved by installing the graphviz module in your system.
By following the guide above, there’s no doubt that you’ll be able to resolve this error quickly.
We hope you’ve learned a lot from this.
Thank you for reading!
Elijah Galero
Programmer & Technical Writer at PIES IT Solution
Elijah Galero is a programmer and writer at PIES IT Solution, author of 175+ tutorials at itsourcecode.com. Specializes in Python error debugging (AttributeError, TypeError, ModuleNotFoundError), Python programming tutorials, and Microsoft Excel how-to guides for BSIT students and productivity learners.
Expertise: Python · Python Errors · Python AttributeError · Python TypeError · ModuleNotFoundError · MS Excel · MS PowerPoint · View all posts by Elijah Galero →