from textwrap import *
#使用textwrap中的wrap()方法
def test_wrap():
  test_str = '''\
  The textwrap module provides two convenience functions, wrap() and fill(), as well as 1
  TextWrapper, the class that does all the work, and two utility functions, dedent() and indent(). If 2
  you're just wrapping or filling one or two text strings, the convenience functions should be good 3
  enough; otherwise, you should use an instance of TextWrapper for efficiency. 4
  '''
  print(wrap(test_str, 20))
def main():
  test_wrap()
if __name__ == '__main__':
  main()

Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:03:43) [MSC v.1600 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> ================================ RESTART ================================
>>> 
['  The textwrap', 'module provides two', 'convenience', 'functions, wrap()', 'and fill(), as well', 'as 1', 'TextWrapper, the', 'class that does all', 'the work, and two', 'utility functions,', 'dedent() and', 'indent(). If 2', 'you're just wrapping', 'or filling one or', 'two text strings,', 'the convenience', 'functions should be', 'good 3   enough;', 'otherwise, you', 'should use an', 'instance of', 'TextWrapper for', 'efficiency. 4']
>>>

from textwrap import *
#fill()方法
def test_wrap():
  test_str = '''\
  The textwrap module provides two convenience functions, wrap() and fill(), as well as 1
  TextWrapper, the class that does all the work, and two utility functions, dedent() and indent(). If 2
  you're just wrapping or filling one or two text strings, the convenience functions should be good 3
  enough; otherwise, you should use an instance of TextWrapper for efficiency. 4
  '''
  print(fill(test_str, 40))
def main():
  test_wrap()
if __name__ == '__main__':
  main()

Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:03:43) [MSC v.1600 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> ================================ RESTART ================================
>>> 
  The textwrap module provides two
convenience functions, wrap() and
fill(), as well as 1   TextWrapper,
the class that does all the work, and
two utility functions, dedent() and
indent(). If 2   you're just wrapping
or filling one or two text strings, the
convenience functions should be good 3
enough; otherwise, you should use an
instance of TextWrapper for efficiency.
>>>

from textwrap import *
#dedent()方法
def test_wrap():
  test_str = '''\
  The textwrap module provides two convenience
    functions, wrap() and fill(), as well as 1
  TextWrapper, the class that does all the work,
    and two utility functions, dedent() and indent(). If 2
  you're just wrapping or filling one or two text strings,
    the convenience functions should be good 3
  enough; otherwise, you should use an instance
    of TextWrapper for efficiency. 4
  '''
  print(repr(dedent(test_str)))
def main():
  test_wrap()
if __name__ == '__main__':
  main()

Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:03:43) [MSC v.1600 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> ================================ RESTART ================================
>>> 
'The textwrap module provides two convenience\n  functions, wrap() and fill(), as well as 1\nTextWrapper, the class that does all the work,\n  and two utility functions, dedent() and indent(). If 2\nyou're just wrapping or filling one or two text strings,\n  the convenience functions should be good 3\nenough; otherwise, you should use an instance\n  of TextWrapper for efficiency. 4\n'
>>>