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Python VirtualEnv

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A Virtual Environment in Python is a self-contained directory that contains a Python installation for a specific project. It keeps dependencies isolated from your global Python setup.

🔹 Why Use a Virtual Environment?

  • Prevents dependency conflicts between projects

  • Keeps your project environment clean and manageable

  • Lets you use different versions of packages for different projects

🔹 Create a Virtual Environment

Use the built-in venv module:

python -m venv myenv

✅ This will create a folder named myenv with the virtual environment inside it.

🔹 Activate the Virtual Environment

On Windows:
myenv\Scripts\activate
On macOS/Linux:
source myenv/bin/activate

✅ Once activated, your terminal will show the environment name like:
(myenv) C:\Users\...>

🔹 Install Packages Inside VirtualEnv

Now that you're inside the virtual environment, use pip as usual:

pip install flask

The installed packages stay isolated from your system Python.

🔹 Deactivate the Virtual Environment

When you're done:

deactivate

✅ You’ll exit the virtual environment and return to your global Python path.

🔹 Delete a Virtual Environment

Just delete the folder:

rm -r myenv

🔹 Check Installed Packages in VirtualEnv

pip list

You’ll only see packages installed within that environment.

Practice Questions

Q1. Write a Python command to create a virtual environment called projectenv.

Q2. Write a command to activate the virtual environment on Windows.

Q3. Write a command to install the django package inside the virtual environment.

Q4. Write a command to list all installed packages inside the virtual environment.

Q5. Write a command to deactivate the virtual environment.

Q6. Write a command to create a requirements.txt file using pip freeze.

Q7. Write a command to install dependencies from requirements.txt inside a virtual environment.

Q8. Write a command to delete a virtual environment folder named projectenv.

Q9. Write a short explanation or command to use a virtual environment to avoid package conflicts.

Q10. Write steps to use different versions of the same package in two separate virtual environments.

Python VirtualEnv Quiz

Q1: What does a virtual environment do?

A. Updates Python
B. Runs faster code
C. Isolates project dependencies
D. Deletes packages

Q2: Which command creates a virtual environment?

A. pip install venv
B. python venv
C. python -m venv envname
D. create venv

Q3: How do you activate virtualenv on Windows?

A. source env/bin/activate
B. env\Scripts\activate
C. activate env
D. python activate

Q4: What does deactivate do in virtualenv?

A. Deletes the environment
B. Closes Python
C. Exits the virtual environment
D. Updates pip

Q5: Which package manager is used inside virtualenv?

A. apt
B. pip
C. brew
D. zip

Q6: Where are packages stored in a virtualenv?

A. Globally
B. In system Python
C. Inside the virtual environment directory
D. On the desktop

Q7: Can you have multiple virtual environments on the same system?

A. No
B. Yes
C. Only one per Python version
D. Only with conda

Q8: How do you remove a virtual environment?

A. deactivate
B. pip uninstall
C. delete the folder
D. venv clear

Q9: What is the default folder name when creating a virtual environment?

A. env
B. venv
C. site
D. python_env

Q10: What command lists installed packages inside virtualenv?

A. pip list
B. show packages
C. venv show
D. python list
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