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Best Practices

Security Best Practices

Writing secure Python code and avoiding vulnerabilities

Interview: Security awareness — all levels

Security

Python applications face the same security threats as any web service. Key areas: input validation, dependency management, and secret handling.

Critical Rules

  • Never use exec() or eval() on user input — allows arbitrary code execution
  • Use parameterized queries — never string formatting for SQL
  • Pin dependencies — use tools like Dependabot for vulnerability alerts
  • Never commit secrets — use environment variables or vault services
  • Validate and sanitize all input — especially from HTTP requests