text: #Initialize an empyy list: medals
  medals =[]
  
  for medal in medal_types:
      # Create the file name: file_name
      file_name = "%s_top5.csv" % medal
      # Create list of column names: columns
      columns = ['Country', medal]
      # Read file_name into a DataFrame: medal_df
      medal_df = pd.read_csv(file_name,header=0,index_col='Country',names=columns)
      # Append medal_df to medals
      medals.append(medal_df)
  
  # Concatenate medals horizontally: medals_df
  medals_df = pd.concat(medals,axis='columns')
  
  # Print medals_df
  print(medals_df)