Six, Python IO and anomalies 3, write files

3, write files

（1）write(str或bytes)

Description : the output string or byte string (binary mode only (b mode) can be written to open a file byte string)

• Output string

  with open('data.txt', 'a', True, 'GBK') as f:
      f.write('痴迷、淡然\r\n')
  

• Output byte string

  with open('data.txt', 'ab', True) as f:
      f.write('万物皆不自由\r\n'.encode('GBK'))
  

(2) writelines (iterables)

Description : a plurality of output byte strings or more strings

• Output string

  import os
  with open('data.txt', 'a', True, 'GBK') as f:
      f.writelines((('我心里那一座天下'+os.linesep),
                    ('你坐镇笑靥如桃'+os.linesep)
                   ))
  

• Output byte string

  import os
  with open('data.txt', 'ab', True) as f:
      f.writelines((('世间当真有两全法'+os.linesep).encode('GBK'),
                    ('江山深处抚你风华'+os.linesep).encode('GBK')
  
                   ))
  

(3) line breaks

operating system	Newline
Windows	‘\r\n’
*nux	‘\n’
Tag works automatically with	os.linesep