Python Tips

  >>> re.split("[^0-9]", "12 34 + 2 *")
  ['12', '34', '', '', '2', '', '']

  str("abcdef")[::-1] ==> "fedcba"
  reduce(lambda x,y:y+x,"abcdef") ==> "fedcba"
  sorted([1,5,3,2]) ==> [1,2,3,5]
  a = [1,5,3,2]; a.sort() ==> a := [1,2,3,5]

  ### demostrate loop a dict and list/dict parameter
  def tst_dict(*args, **kargs):
      for k, v in dict(*args, **kargs).iteritems():
          print k, v

  def tst_dict2():
      for key in a_dict:
          print key, a_dict[key]

  tst_dict(name='aa', place='bb')
  tst_dict('aaa', 'bbb') # throw error

  range(4) ==> [0,1,2,3] #range start from 0 by default
  '%s: %r' % (something, other)
  '%(name)s is %(value)d' % {
      'name': 'The answer',
      'value': 42,
  }