freezehelper 2.0.0

A Python package to simplify checks for frozen state and executable directory

freezehelper: A Python package to simplify checks for frozen state and executable directory (such as when using PyInstaller)

It provides:

• attributes to check platform, freeze state, and whether running in a child or parent process

Original use case:

• Python program that is deployed frozen (using PyInstaller) but is run from source while developed

• When running from source I wanted to perform extra actions/checks on startup, e.g.:

  • setting a different log level/log to console or replacing sys.excepthook

  • changing what gets run in a child process on start when using multiprocessing

Installation:

• pip install freezehelper

  (Tested for Python >=3.6.5 on Linux (Ubuntu) and Windows 10)

Usage:

• quick-start overview:

  # import the package
  import freezehelper
  
  ## Package Attributes
  
  # A bool to check if running from source:
  freezehelper.from_source
  
  # A bool to check if frozen:
  freezehelper.frozen
  
  # More bool items for platform:
  freezehelper.is_linux
  freezehelper.is_not_linux
  freezehelper.is_mac
  freezehelper.is_not_mac
  freezehelper.is_windows
  freezehelper.is_not_windows
  
  # Functions to check for process context:
  freezehelper.is_child_process()
  freezehelper.is_main_process()
  
  # Path string for directory containing the main executable:
  freezehelper.executable_dir
  
  # Path string for the main executable:
  freezehelper.executable_path
  
  # NOTE: If your script is ever executed from a module, such as pytest, then that module will be the executable path.
  # Be sure to account for such cases if necessary. For example:
  # If invoked by 'python -m pytest', then freezehelper.executable_path would be the path to the pytest package.
  # One way to account for this from the main program file:
  import os
  if freezehelper.executable_dir.endswith("pytest"):
      PROGRAM_DIR = os.path.dirname(os.path.realpath(__name__))
  else:
      PROGRAM_DIR = freezehelper.executable_path
  
  ## Functions
  
  # Functions for getting directory of executable or path to main executable:
  # These accept a bool resolve_links keyword argument.
  # When True (default), any symbolic links in the path are resolved in order to get the real path.
  freezehelper.get_executable_dir()
  freezehelper.get_executable_path()
  
  
  ## Examples
  if freezehelper.frozen:
      print(f"{freezehelper.executable_path} go brrr")
  
  # create separate logs for parent and child processes
  import logcontrol
  import os
  
  log_dir = os.path.join(freezehelper.executable_dir, "logs")
  child_log_dir = os.path.join(log_dir, "workers")
  
  if freezehelper.is_main_process():
      log_file = os.path.join(log_dir, "main_process.log")
  else:
      log_file = os.path.join(child_log_dir, f"{os.getpid()}_worker.log")
  
  logcontrol.set_log_file(log_file)