code: def find_a_system_python(line):
      
  
      from .vendor.pythonfinder import Finder
      finder = Finder(system=False, global_search=True)
      if not line:
          return next(iter(finder.find_all_python_versions()), None)
      # Use the windows finder executable
      if (line.startswith("py ") or line.startswith("py.exe ")) and os.name == "nt":
          line = line.split(" ", 1)[1].lstrip("-")
      python_entry = find_python(finder, line)
      return python_entry
docs: Find a Python installation from a given line.
  
      This tries to parse the line in various of ways:
  
      * Looks like an absolute path? Use it directly.
      * Looks like a py.exe call? Use py.exe to get the executable.
      * Starts with "py" something? Looks like a python command. Try to find it
        in PATH, and use it directly.
      * Search for "python" and "pythonX.Y" executables in PATH to find a match.
      * Nothing fits, return None.