old_contents: # Copyright (c) Pymatgen Development Team.
  # Distributed under the terms of the MIT License.
  
  """
  This package contains core modules and classes for representing structures and
  operations on them.
  """
  
  import os
  import warnings
  
  from ruamel.yaml import YAML
  
  from .composition import Composition
  from .lattice import Lattice
  from .operations import SymmOp
  from .periodic_table import DummySpecies, Element, Species
  from .sites import PeriodicSite, Site
  from .structure import IMolecule, IStructure, Molecule, Structure
  from .units import ArrayWithUnit, FloatWithUnit, Unit
  
  __author__ = "Pymatgen Development Team"
  __email__ = "pymatgen@googlegroups.com"
  __maintainer__ = "Shyue Ping Ong"
  __maintainer_email__ = "shyuep@gmail.com"
  __version__ = "2022.2.1"
  
  yaml = YAML()
  SETTINGS_FILE = os.path.join(os.path.expanduser("~"), ".pmgrc.yaml")
  
  
  def _load_pmg_settings():
      # Load environment variables by default as backup
      d = {}
      for k, v in os.environ.items():
          if k.startswith("PMG_"):
              d[k] = v
          elif k in ["VASP_PSP_DIR", "MAPI_KEY", "DEFAULT_FUNCTIONAL"]:
              d["PMG_" + k] = v
  
      # Override anything in env vars with that in yml file
      try:
          with open(SETTINGS_FILE) as f:
              d_yml = yaml.load(f)
          d.update(d_yml)
      except Exception as ex:
          # If there are any errors, default to using environment variables
          # if present.
          warnings.warn(f"Error loading .pmgrc.yaml: {ex}. You may need to reconfigure your yaml file.")
          pass
  
      d = d or {}
      return dict(d)
  
  
  SETTINGS = _load_pmg_settings()
  locals().update(SETTINGS)
  
new_contents: # Copyright (c) Pymatgen Development Team.
  # Distributed under the terms of the MIT License.
  
  """
  This package contains core modules and classes for representing structures and
  operations on them.
  """
  
  import os
  import warnings
  
  from ruamel.yaml import YAML
  
  from .composition import Composition
  from .lattice import Lattice
  from .operations import SymmOp
  from .periodic_table import DummySpecies, Element, Species
  from .sites import PeriodicSite, Site
  from .structure import IMolecule, IStructure, Molecule, Structure
  from .units import ArrayWithUnit, FloatWithUnit, Unit
  
  __author__ = "Pymatgen Development Team"
  __email__ = "pymatgen@googlegroups.com"
  __maintainer__ = "Shyue Ping Ong"
  __maintainer_email__ = "shyuep@gmail.com"
  __version__ = "2022.2.1"
  
  yaml = YAML()
  SETTINGS_FILE = os.path.join(os.path.expanduser("~"), ".pmgrc.yaml")
  
  
  def _load_pmg_settings():
      # Load environment variables by default as backup
      d = {}
      for k, v in os.environ.items():
          if k.startswith("PMG_"):
              d[k] = v
          elif k in ["VASP_PSP_DIR", "MAPI_KEY", "DEFAULT_FUNCTIONAL"]:
              d["PMG_" + k] = v
  
      # Override anything in env vars with that in yml file
      try:
          with open(SETTINGS_FILE) as f:
              d_yml = yaml.load(f)
          d.update(d_yml)
      except Exception as ex:
          # If there are any errors, default to using environment variables
          # if present.
          warnings.warn(f"Error loading .pmgrc.yaml: {ex}. You may need to reconfigure your yaml file.")
          pass
  
      return d
  
  
  SETTINGS = _load_pmg_settings()
  locals().update(SETTINGS)
  
subject: Remove some redundant code