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45. Installing Packages with pip Revisited

1. Introduction​

We learned about pip in Chapter 15.
Now we’ll go deeper into best practices for package management in real projects.

2. Installing a Specific Version​

pip install requests==2.31.0

3. Upgrading and Downgrading​

pip install --upgrade requests
pip install requests==2.28.0

4. Uninstalling Packages​

pip uninstall requests

5. Listing Installed Packages​

pip list

6. Searching for Packages​

pip search flask

7. Using requirements.txt​

Create:

pip freeze > requirements.txt

Install from file:

pip install -r requirements.txt

8. Using pip in Virtual Environments​

Always activate your environment before installing packages.
This keeps dependencies isolated.

9. Common Issues​

  • Permission errors → use --user or virtual environments.
  • Version conflicts → check pipdeptree or use virtual environments.

10. Next Steps​

✅ You now understand advanced pip usage.
In the next chapter, we’ll learn about reading text files.