13.7. File Append

• Appends data at the end of file

• Creates file if not exists

• Works with both relative and absolute path

• Fails when directory with file cannot be accessed

• mode parameter to open() function is required

• .writelines() does not add a line separator!!

>>> file = open(r'/tmp/myfile.txt', mode='a')
>>> file.write('hello')
5
>>> file.close()

13.7.1. Appending to File

• Append to the end of file

  >>> FILE = r'/tmp/myfile.txt'
  >>> DATA = 'We choose to go to the Moon...'
  >>>
  >>> with open(FILE, mode='a') as file:
  ...     file.write(DATA)
  30