docs: def fromexcel(cls, path, sheet_name_or_num=0, headers=None):
          """
          Constructs a new DataTable from an Excel file.
  
          Specify sheet_name_or_number to load that specific sheet.
  
          Headers will be inferred automatically, but if you'd prefer
          to load only a subset of all the headers, pass in a list of the
          headers you'd like as `headers`.
  
          ---
  
          Alternatively, it's quite simple to:
  
              reader = ExcelReader('myfile.xls')
              reader.change_sheet('default')
              data = DataTable(reader)
          """
          reader = ExcelRW.UnicodeDictReader(path, sheet_name_or_num)
          return cls(reader, headers=headers)