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Representing large numbers in python: the underscore separator

Recently, I learnt a simple way of representing large numbers in python. Say, I had a large number like 8736570164 I had to manually (and erratically) point my finger at the monitor on that number…

  • Large numbers in Python can be represented using underscore separator introduced in version 3.6
  • Underscore cannot start/end number nor be consecutive; causes error
  • Underscores work with floats but not adjacent to decimal point

From Access Log to Kernel Drop: Building a Single-Process WAF Ban Pipeline in C

In self-hosted Linux infrastructure, bridging L7 application security with L3/L4 network enforcement traditionally requires stitching together multiple independent daemons.

  • Single-process C binary WAF avoids fragmentation and memory overhead
  • Zero-copy log parser and OWASP CRS for pattern matching
  • XDP kernel enforcement with ipset fallback for high performance

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