code: def open(cls, filename, crs=None):
          
          with fiona.Env():
              with fiona.open(filename, 'r') as source:
                  original_crs = CRS(source.crs)
                  schema = source.schema
                  length = len(source)
          crs = crs or original_crs
          ret_val = cls(filename, crs, schema, length)
          return ret_val
docs: Creates a FileCollection from a file in disk.
  
          Parameters
          ----------
          filename : str
              Path of the file to read.
          crs : CRS
              overrides the crs of the collection, this funtion will not reprojects