Rotating file implementation for python. I'm ignoring any error handling and proper closing here

rotating_file.py

import os
import os.path

buffer_in_bytes = 10 * 100 * 100

class RotatingFile:
  def __init__(self, filename, max_files, lines_per_file):
    self.file = open(filename, mode='w', buffering=buffer_in_bytes)
    self.filename = filename
    self.max_files = max_files
    self.lines_per_file = lines_per_file
    self.lines_written = 0
      
  def write(self, message):
    if (self.lines_written >= self.lines_per_file):
      self.rotate_file()
    self.file.write(message)
    self.lines_written += 1

  def rotate_file(self):
    self.file.close()
    name = self.filename
    for f in reversed(range(1, self.max_files)):
      src = name + '.' + str(f)
      dst = name + '.' + str(f + 1)
      file_exists = os.path.isfile(src)
      if (file_exists):
        os.rename(src, dst)
    os.rename(name, name + '.1')
    self.file = open(name, mode='w', buffering=buffer_in_bytes)
    self.lines_written = 0