code: def df_to_string(df):
      """
      Create a formatted str representation of the DataFrame.
  
      Parameters
      ----------
      df: DataFrame
  
      Returns
      -------
      str
  
      """
      pd.set_option("display.expand_frame_repr", False)
      pd.set_option("precision", 8)
      pd.set_option("display.width", 1000)
      pd.set_option("display.max_colwidth", 1000)
  
      return df.to_string()
  
imports: import copy
  import csv
  import json
  import numbers
  import os
  import time
  import numpy
  import pandas
  from catalyst.assets._assets import TradingPair
  from catalyst.exchange.utils.exchange_utils import get_algo_folder
  from catalyst.utils.paths import data_root, ensure_directory
  from operator import itemgetter
label_desc: Use image node_id 13 for calling a global function with example usage: df_to_string(df) and returns: df