This is the common error we face after importing any specific library or copying the code from the portal or trying to run the script that we have written very long.

ModuleNotFoundError: No module named <PackageName>

Why this error?

This error of ModuleNotFoundError: No module named '' generally occurs because the package that we want is not successfully imported by python. 

So the simplest and straightforward solution to this issue is to debug the error, by reading the error carefully and installing that package with a simple pip install.

Three-Step Solution to this error

Step 1:- Open Terminal/ CMD depending on your OS

Step 2:- First Check whether the Pip/Brew is installed or not ( simply type pip or brew and hit enter ) If getting an error install read below 

Step 3:- Run this command in the Terminal

Check if the Package Install 

Use pip show <PackageName>

Install the package using the above command, it will definitely fix the issue.

Still not Resolved the Error?

Then you need to troubleshoot the issue for the different following result

Installation process for  Different Setup

Conda

#To install a package in the currently active environment

conda install package-name

#To install a specific package version into a specific named environment

conda install package-name=2.3.4 -n some-environment

You can also use Offline Install if the .tar file of that package is available

conda install /path-to-package/package-filename.tar.bz2/

For more can refer original Doc https://docs.conda.io/projects/conda/en/latest/user-guide/concepts/installing-with-conda.html

Spyder

If you want to install a package in spyder, means you are already set up conda environment, like 

conda create -n spyder env -y

conda activate spyder -env

If this is done then installing any package is simple

Run conda install numpy -y

https://docs.spyder-ide.org/current/_images/faq-run-environment.png

For more delta read Official Documentation https://docs.spyder-ide.org/current/faq.html

Jupyter

If you want to install the package in Jupyter then you need to use 

Or

But for this Jupyter must be installed already

If not read Install Jupyter 

MAC OS /m1.zsh

In Mac m1 or in Older versions also installing python package methods is the same,  In macOS, we have a .zsh terminal, but then also needs the same process as Linux/ubuntu. 

Check whether Python is installed or not 

python --version

Check Where python is installed

which python

which python3

Two ways to install the package 

Using Brew

Check Brew in Present brew --version

Using Pip

Check whether the pip is present or not  pip --version 

And if you have python2 and python3 both try to use pip3 --version

Windows

In windows, this process is quite a similar check for pip, and if git bash then no issue.

Otherwise use this code

Linux ubuntu bash

In Linux Python and pip come preinstall if not you can use 

To install pip in any Linux distro

Note:- If you are using the Ubuntu AWS ec2 instance you need to update the system and then have to try installing pip

PyCharm

Pycharm is a cross-platform IDE that provides consistent experience on the Windows, macOS, and Linux operating systems.

Here also it is simple if you have already PyCham installed, just follow the below steps

Package Installation in PyCharm IDE

1. Open Pycharm and Go to File
2. Click on Settings
3. On the left side, You will find the Projects Option. Click & Expend it
4. Click on Interpreter
5. A list of the installed packages will be shown
6. On Right Side, You will see a + button. Click This to install a new package
7. A window will appear with the Search bar, then search your package name and hit the install button.

Readme:- https://www.jetbrains.com/help/pycharm/package-installation-issues.html#results

Django

There is no special installation needed 

Xcode

Vscode 

Nowadays VsCode is the First Choice of any developer, and installing the library in vs code is not different than a simple pip install.

If you are using git bash, just open the terminal check pip is installed or not, and run the pip install package.

If using windows read the window installation guide given above.

Google Collab 

Google Colab is online 

!pip install package_name

import package_name

Common Error and how to solve it

Spelling Error

Package 

Package Name Change 

Some package 

Module change with version

User Defined Module

User defines modules are the module that is created by yourself or the file code present in the same folder.

So if no module error is for this file name then you don't need to install any package from the pip as the code that you are trying to use is already there in the folder.

For this reason, there may be other reasons like

1. Not using the correct path
2. Using absolute path
3. The file name is not correct, you misspelled/ done a typo in the name
4. Casing issue

Python 2 versus python3

This may be the potential Error if you are using python3 and python2 simultaneously, environment is different for both, like python2 filename.py run the code in python2 environment and python3 filename,,py run the code in python3.

In the same way installation of libraries is both environment is also different, so for install the package in any particular version you need to specify the pip.

pip install <PackageName>

pip3 install <PackageName>

Try this it will help.

Install Pip or upgrade it

Many times this is also one of the issues that you are using python2 and the library is not compatible with that version. 

Another reason might be that the pip is not installed or not upgraded, and that stopping you from the 

Clear the cache pip

Debugging in Python

Debugging any language code is not a complex process, just read the error, see the line number and check for that. In our Case for module error, we just need to read the error and need to see if the library we are importing is present in our system or if its name is changed or if troubleshooting will solve our issue.

Here read:-  Art of Debugging the code

How to install All the Packages that are needed to install for any particular project

If you have cloned any GitHub project or got a python file from someone, The simplest way to install all the required libraries is using pip freeze.

Use pip freeze > requirement.txt

This will create a requirement file that contains the name of all the libraries that are needed to run any particular python code.

To install all the liberties use 

pip install -r requirement.txt

For python3 

pip3 install -r requirement.txt

There are a lot of pip commands you can learn here. 

Conclusion

So we definitely think, this article helps you to fully understand about the error and why the error occurs in the first place. This module error is very frustrating for all beginners and if you are dealing with any GitHub project and trying to learn and explore that, you will get this error quite often

There may be different reasons for this error, like spelling mistakes in the package, If the name is correct then check the casing, the package owner changes the name of the package while updating the library, Also if you are trying to use your own file from some different path check the path.

So Will wrap up here, As I think we have covered all the possible issues, why who what about the error, I think things are clear, further also for more such errors you can search on our blog.

Happy learning, Keep Coding Keep Growing.

How to install Pip

In Window

Check pip is present or not

In Linux

Check pip is present or not

In macOS

Check pip is present or not

All pip Commands