class_docstr: Unpacks various data representations from the given buffer.
class_docstr_tok: ["Unpacks","various","data","representations","from","the","given","buffer","."]
code: def unpack_fstring(self, n):
      if n < 0:
          raise ValueError("fstring size must be nonnegative")
      i = self.__pos
      j = i + (n + 3) // 4 * 4
      if j > len(self.__buf):
          raise EOFError
      self.__pos = j
      return self.__buf[i : i + n]
  
imports: import struct
  from io import BytesIO
  from functools import wraps
  import warnings
label_desc: Use image node_id 14 for calling the Unpacker obj's underlying member method code with example usage: obj.unpack_fstring(n) and returns: self