code: def getuser():
      """Get the username from the environment or password database.
  
      First try various environment variables, then the password
      database.  This works on Windows as long as USERNAME is set.
  
      """
  
      for name in ("LOGNAME", "USER", "LNAME", "USERNAME"):
          user = os.environ.get(name)
          if user:
              return user
  
      # If this fails, the exception will "explain" why
      import pwd
  
      return pwd.getpwuid(os.getuid())[0]
  
file_path: catboost/contrib/tools/python3/src/Lib/getpass.py
imports: import contextlib
  import io
  import os
  import sys
  import warnings
label_desc: Use image node_id 5 for calling a global function with example usage: getuser() and returns: pwd, user