November of 2021

Computer Science⚑

GNULinux⚑

(../git.md)⚑

• New: Git stash.

  If you have uncommitted changes and you want to switch to another branch, you can temporarily save those changes with:

  git stash
  

  Then, to reapply them, do:

  git stash pop
  

(../computer_science/gnu_linux/postgresql.md)⚑

• New: Change user password.

  ALTER USER user_name WITH PASSWORD 'new_password';
  

Programming⚑

(../computer_science/programming/python/asyncio.md)⚑

• New: Limit concurrency.

  Use (https://docs.python.org/3/library/asyncio-sync.html#semaphores).

  sem = asyncio.Semaphore(10)
  
  async with sem:
      # work with shared resource
  

(../computer_science/programming/python/pip.md)⚑

• New: Requirements files structure.

Other⚑

• New: Retrying library for Python.

  from tenacity import retry, stop_after_attempt, wait_exponential
  
  @retry(stop=stop_after_attempt(3), wait=wait_exponential(multiplier=0.1))
  def somefunction():
    raise Exception
  

  The function will be retried a maximum of 3 times, waiting 0.1 s, 0.2 s and 0.4 s between each attempt respectively.