Python 37

What is virtual environment in python?

A virtual environment is an isolated python environment created for a specific project.

it has :

• its own python interpreter
• its own installed packages
• its own package versions

Packages installed in on virtual environment do not affect 

Compatibility of the one project to another project 

one framework will support ,another framework will not support 

For ex:- one project will support 3.15, old 3.15 ,LongChain will support 3.13 upto

so it will not support 3.14 the project will fail when you executed, for this over come the issue , we will built 3.13 or 312, project it self that is called virtual environment

Step1:

PS C:\Users\Administrator\Desktop\CCIT\PythonCourse\Day37> flask --version

Python 3.14.0

Flask 3.1.2

Werkzeug 3.1.5

Step2: Uninstall flask

PS C:\Users\Administrator\Desktop\CCIT\PythonCourse\Day37.1> pip uninstall flask

Found existing installation: Flask 3.1.2

Step3: getting error ,Flask is global unstall,now we have to instal flask vituvally

PS C:\Users\Administrator\Desktop\CCIT\PythonCourse\Day37.1> python app.py      

Traceback (most recent call last):

  File "C:\Users\Administrator\Desktop\CCIT\PythonCourse\Day37.1\app.py", line 1, in <module>

    from flask import Flask, jsonify, request

ModuleNotFoundError: No module named 'flask'

Step4: Flask install virtual for project specific

[Optional, if any issue Allow scripts only for your user]

PS C:\Users\Administrator\Desktop\CCIT\PythonCourse\Day37> Set-ExecutionPolicy -Scope CurrentUser -ExecutionPolicy RemoteSigned

Step5: Activate the python for virtual environment

PS C:\Users\Administrator\Desktop\CCIT\PythonCourse\Day37>python -m venv ccit-env

PS C:\Users\Administrator\Desktop\CCIT\PythonCourse\Day37> ccit-env1\Scripts\activate

Step6: Install flask

(ccit-env1) PS C:\Users\Administrator\Desktop\CCIT\PythonCourse\Day37> pip install flask

Step7: After install, project work with flask because of all libraries are loaded  project itself 

(ccit-env1) PS C:\Users\Administrator\Desktop\CCIT\PythonCourse\Day37> python app.py  

All Libararies

Step7: Come out from virtual environment enter deactivate

(ccit-env1) PS C:\Users\Administrator\Desktop\CCIT\PythonCourse\Day37> deactivate

PS C:\Users\Administrator\Desktop\CCIT\PythonCourse\Day37>

PyCharm Download

https://pycharm-community-edition.en.softonic.com/

3.5GB Storage required to install 

AI Related (GIT-Hub Copilot,RAG,LangChain,LLMS - communication, ollma)

PyCharm tool ,automatically interpreter installed project level, choose your appropriate environment.

Install Flask 

App.py

from flask import Flask, jsonify, request
app = Flask(__name__)
@app.route("/", methods=['GET'])
def home():
return "<h1>Welcome to the Flask API! Project1</h1>"
if __name__ == '__main__':
app.run(debug=True)

--Thanks--