Source Code for Module lastfm.safelist

 1  #!/usr/bin/env python 
 2   
 3  __author__ = "Abhinav Sarkar <abhinav@abhinavsarkar.net>" 
 4  __version__ = "0.2" 
 5  __license__ = "GNU Lesser General Public License" 
 6   
 7  import sys 
 8 -class SafeList(object): 
 9 -    def __init__(self, lst, add_func, remove_func): 
10          self._list = lst 
11          self._add_func = add_func 
12          self._remove_func = remove_func 
13   
14 -    def add(self, lst): 
15          if not isinstance(lst, (list, tuple)): 
16              lst = [lst] 
17          self._add_func(lst) 
18   
19 -    def remove(self, lst): 
20          if not isinstance(lst, (list, tuple)): 
21              lst = [lst] 
22          for l in lst: 
23              self._remove_func(l) 
24   
25 -    def __iter__(self): 
26          for i in xrange(len(self._list)): 
27              yield self._list[i] 
28   
29 -    def _tuple_from_slice(self, i): 
30          """ 
31          Get (start, end, step) tuple from slice object. 
32          """ 
33          (start, end, step) = i.indices(len(self._list)) 
34          # Replace (0, -1, 1) with (0, 0, 1) (misfeature in .indices()). 
35          if step == 1: 
36              if end < start: 
37                  end = start 
38              step = None 
39          if i.step == None: 
40              step = None 
41              return (start, end, step) 
42   
43   
44 -    def __getitem__(self, i): 
45          if isinstance(i, slice): 
46              (start, end, step) = self._tuple_from_slice(i) 
47              if step == None: 
48                  indices = xrange(start, end) 
49              else: 
50                  indices = xrange(start, end, step) 
51              return [self._list[i] for i in indices] 
52          else: 
53              return self._list[i] 
54   
55 -    def index(self, x, i=0, j=None): 
56          if i != 0 or j is not None: 
57              (i, j, ignore) = self._tuple_from_slice(slice(i, j)) 
58          if j is None: 
59              j = len(self) 
60          for k in xrange(i, j): 
61              if self._list[k] == x: 
62                  return k 
63          raise ValueError('index(x): x not in list') 
64   
65      # Define sort() as appropriate for the Python version. 
66      if sys.version_info[:3] < (2, 4, 0): 
67 -        def sort(self, cmpfunc=None): 
68              ans = list(self._list) 
69              ans.sort(cmpfunc) 
70              self._list[:] = ans 
71      else: 
72 -        def sort(self, cmpfunc=None, key=None, reverse=False): 
73              ans = list(self._list) 
74              if reverse == True: 
75                  ans.sort(cmpfunc, key, reverse) 
76              elif key != None: 
77                  ans.sort(cmpfunc, key) 
78              else: 
79                  ans.sort(cmpfunc) 
80              self._list[:] = ans 
81   
82 -    def __len__(self): 
83          return len(self._list) 
84   
85 -    def __repr__(self): 
86          return repr(self._list) 
87