Secure Coding Practices
Write Python that does not hand your database to a stranger
6 lessons · 1.3 hours of reading
· Intermediate · 3 free
Learn how the common classes of security bug arise and how to close them in code. Every lesson gives the working fix in full: parameterised queries, output encoding, environment variables, pinned dependencies and safe logging.
Lessons
1
Never trust user input
Where input really comes from, and why allow-lists beat blocklists.
2
SQL injection and parameterised queries
Why string-built SQL breaks, and how parameters remove the whole class of bug.
3
XSS and output encoding
The same code-versus-data confusion, this time in the browser, and how escaping fixes it.
4
Secrets management in code
Keys out of the repository, into the environment, and what to do when one leaks.
5
Dependency and supply-chain hygiene
Your code is 5% yours. How to know what the other 95% is doing.
6
Logging and error handling without leaks
Tell the user nothing useful, tell your logs everything, and keep secrets out of both.
Lessons 4 to 6 need a Pro pass
A pass also opens every other course's paid lessons, all 50 mock test papers and the company-wise test series. It ends on its own date — nothing renews by itself and nothing is charged without you pressing a button.
See passes — from ₹29