python对list两种方式排序

list_temp = [7,8,3,4,5]

list_tmp = [{"word":"c","num":1},{"word":"a","num":8},{"word":b,"num":4}]

list_tp = [(a,3),(b,1),(c,2)]

sort

sort用法很easy:

>>list_temp 

  [7,8,3,4,5]

>>list_temp.sort()

>>list_temp

  [3,4,5,7,8]

sorted

sorted用法稍微复杂：

sorted(iterable, cmp=None, key=None, reverse=False)

eg1:

>>list_tmp

  [{"word":"c","num":1},{"word":"a","num":8},{"word":b,"num":4}]

>>sorted(list_tmp,cmp=lambda x,y:cmp(x['word'],y['word']))

  [{"word":"a","num":8},{"word":b,"num":4},{"word":"c","num":1}]

>>list_tmp

  [{"word":"c","num":1},{"word":"a","num":8},{"word":b,"num":4}]

eg2:

>>list_tp

  [(a,3),(b,1),(c,2)]

>>sorted(list_tp,key=lambda x:x[1])

  [(b,1),(c,2),(a,3)]

>>list_tp

  [(a,3),(b,1),(c,2)]