old_contents: import time, sys
  
  class ProgressBar:
  
      def __init__(self, num_items, bar_length=50):
          self.num_items = num_items
          self.bar_length = bar_length # Modify this to change the length of the progress bar
          self.step_size = num_items/bar_length
          self.current_num = 0
  
      # update_progress() : Displays or updates a console progress bar
      ## Accepts the current item number (out of the total num_items)
      def update_progress(self, item_num):
  
          if item_num == self.num_items -1:
              print("\n")
              return
  
          if item_num < self.current_num + self.step_size:
              return
  
          self.current_num = item_num
          progress = item_num / self.num_items
  
  
          block = int(round(self.bar_length*progress))
          text = "\rPercent: [{0}] {1}%".format( "#"*block + "-"*(self.bar_length-block), progress*100)
          sys.stdout.write(text)
          sys.stdout.flush()
new_contents: import time, sys
  
  class ProgressBar:
  
      def __init__(self, num_items, bar_length=50, prefix=""):
          self.num_items = num_items
          self.bar_length = bar_length # Modify this to change the length of the progress bar
          self.step_size = num_items/bar_length
          self.current_num = 0
          self.prefix = prefix
  
      # update_progress() : Displays or updates a console progress bar
      ## Accepts the current item number (out of the total num_items)
      def update_progress(self, item_num):
  
          if item_num == self.num_items -1:
              print("\n")
              return
  
          if item_num < self.current_num + self.step_size:
              return
  
          self.current_num = item_num
          progress = item_num / self.num_items
  
  
          block = int(round(self.bar_length*progress))
          text = "\r{:s}Percent: [{:s}] {:2.0f}%".format( self.prefix,"#"*block + "-"*(self.bar_length-block), progress*100)
          sys.stdout.write(text)
          sys.stdout.flush()
subject: Add prefix to progress bar.