parameters: (self)
return_statement: return self
docstring: Starts measuring time, and prints the bar at 0%.
  
          It returns self so you can use it like this:
          >>> pbar = ProgressBar().start()
          >>> for i in range(100):
          ...    # do something
          ...    pbar.update(i+1)
          ...
          >>> pbar.finish()
docstring_summary: Starts measuring time, and prints the bar at 0%.
docstring_tokens: Starts measuring time and prints the bar at 0% .
function: def start(self):
          '''Starts measuring time, and prints the bar at 0%.
  
          It returns self so you can use it like this:
          >>> pbar = ProgressBar().start()
          >>> for i in range(100):
          ...    # do something
          ...    pbar.update(i+1)
          ...
          >>> pbar.finish()
          '''
  
          if self.maxval is None:
              self.maxval = self._DEFAULT_MAXVAL
  
          self.num_intervals = max(100, self.term_width)
          self.next_update = 0
  
          if self.maxval is not UnknownLength:
              if self.maxval < 0: raise ValueError('Value out of range')
              self.update_interval = self.maxval / self.num_intervals
  
  
          self.start_time = self.last_update_time = time.time()
          self.update(0)
  
          return self
function_tokens: def start ( self ) : if self . maxval is None : self . maxval = self . _DEFAULT_MAXVAL self . num_intervals = max ( 100 , self . term_width ) self . next_update = 0 if self . maxval is not UnknownLength : if self . maxval < 0 : raise ValueError ( 'Value out of range' ) self . update_interval = self . maxval / self . num_intervals self . start_time = self . last_update_time = time . time ( ) self . update ( 0 ) return self