docstr: Read the cache if it exists and is well formed.
  
  If it is not well formed, the call to write later should
  resolve the issue.
docstr_tok: ["Read","the","cache","if","it","exists","and","is","well","formed",".","If","it","is","not","well","formed",",","the","call","to","write","later","should","resolve","the","issue","."]
code: def read(cls, mode: Mode) -> Self:
      """Read the cache if it exists and is well formed.
  
      If it is not well formed, the call to write later should
      resolve the issue.
      """
      cache_file = get_cache_file(mode)
      if not cache_file.exists():
          return cls(mode, cache_file)
  
      with cache_file.open("rb") as fobj:
          try:
              data: Dict[str, Tuple[float, int, str]] = pickle.load(
                  fobj
              )
              file_data = {k: FileData(*v) for k, v in data.items()}
          except (pickle.UnpicklingError, ValueError, IndexError):
              return cls(mode, cache_file)
  
      return cls(mode, cache_file, file_data)
  
imports: import hashlib
  import os
  import pickle
  import sys
  import tempfile
  from dataclasses import dataclass, field
  from pathlib import Path
  from typing import Dict, Iterable, NamedTuple, Set, Tuple
  from platformdirs import user_cache_dir
  from _black_version import version
  from black.mode import Mode
label_desc: Use image node_id 1 for calling the Cache obj's underlying member method code with example usage: obj.read(cls, mode) and returns: cls, cls, cls