python

Tags: computers

• CGI scripts:
  • https://www.tutorialspoint.com/python/python_cgi_programming.htm

Context sensitivity: https://groups.google.com/g/comp.theory/c/nJzOyRnAP3k/m/AInZxo48FNIJ?pli=1

Performance Python

Vectorcall

• https://peps.python.org/pep-0590/
• C API to optimize calling of objects
• tp_call too slow
  • Also one function pointer per class, rather than per object. So classes create a lot of intermediate objects

Cpython

• Every object is defined by a C struct called PyTypeObject. This struct contains slots.

Parsing PDF’s in Python

• You can use:
  • pypdf. or pypdf4
  • pdfminer
    • also pypdfparser
  • textract -> https://textract.readthedocs.io/en/stable/python_package.html
  • poppler -> pdf rendering engine?
  • OCR -> tesseract with pytesseract, preprocess with opencv
  • tika.with the python tika interface

Difflib

• https://docs.python.org/3/library/difflib.html
• generates diffs
  • has a series of diffs that allow for fleixible computing of sequences including:
    • html
    • pure strings (get_close_matches)
    • number type diffs

OS

• CPU Count:
  • https://docs.python.org/3/library/os.html#os.cpu_count
  • https://docs.python.org/3/library/os.html#os.sched_getaffinity is not available on all platforms

Discussion Forum Changing from Mailing List

• https://lwn.net/Articles/901744/
  • Scattered community upon mailing lists, was scattered between PR’s, Issues, python-dev, python-committers, etc
  • Unification on Discourse

Python Concurrency

• https://superfastpython.com/python-concurrency-choose-api/
  • Coroutine (asyncio) vs thread (threading) vs process (multiprocessing)