• python2, 3

  import sys
  sys.stdout.write('hello world')
  

• python3

  print('hello world', end="")
  

• python2

  print('hello world', )
  

参考

1. http://www.zhihu.com/question/20390166
2. http://stackoverflow.com/questions/493386/how-to-print-in-python-without-newline-or-space