Mercurial > cpython-lru_cache-weakref

annotate Lib/idlelib/StackViewer.py @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents ef4cca2d6171
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 import os
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2 import sys
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3 import linecache
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4
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5 from idlelib.TreeWidget import TreeNode, TreeItem, ScrolledCanvas
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6 from idlelib.ObjectBrowser import ObjectTreeItem, make_objecttreeitem
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7
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8 def StackBrowser(root, flist=None, tb=None, top=None):
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9 if top is None:
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10 from tkinter import Toplevel
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11 top = Toplevel(root)
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12 sc = ScrolledCanvas(top, bg="white", highlightthickness=0)
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13 sc.frame.pack(expand=1, fill="both")
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14 item = StackTreeItem(flist, tb)
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15 node = TreeNode(sc.canvas, None, item)
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16 node.expand()
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17
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18 class StackTreeItem(TreeItem):
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19
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20 def __init__(self, flist=None, tb=None):
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21 self.flist = flist
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22 self.stack = self.get_stack(tb)
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23 self.text = self.get_exception()
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24
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25 def get_stack(self, tb):
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26 if tb is None:
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27 tb = sys.last_traceback
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28 stack = []
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29 if tb and tb.tb_frame is None:
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30 tb = tb.tb_next
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31 while tb is not None:
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32 stack.append((tb.tb_frame, tb.tb_lineno))
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33 tb = tb.tb_next
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34 return stack
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35
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36 def get_exception(self):
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37 type = sys.last_type
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38 value = sys.last_value
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39 if hasattr(type, "__name__"):
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40 type = type.__name__
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41 s = str(type)
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42 if value is not None:
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43 s = s + ": " + str(value)
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44 return s
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45
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46 def GetText(self):
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47 return self.text
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48
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49 def GetSubList(self):
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50 sublist = []
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51 for info in self.stack:
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52 item = FrameTreeItem(info, self.flist)
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53 sublist.append(item)
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54 return sublist
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55
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56 class FrameTreeItem(TreeItem):
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57
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58 def __init__(self, info, flist):
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59 self.info = info
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60 self.flist = flist
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61
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62 def GetText(self):
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63 frame, lineno = self.info
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64 try:
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65 modname = frame.f_globals["__name__"]
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66 except:
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67 modname = "?"
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68 code = frame.f_code
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69 filename = code.co_filename
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70 funcname = code.co_name
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71 sourceline = linecache.getline(filename, lineno)
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72 sourceline = sourceline.strip()
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73 if funcname in ("?", "", None):
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74 item = "%s, line %d: %s" % (modname, lineno, sourceline)
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75 else:
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76 item = "%s.%s(...), line %d: %s" % (modname, funcname,
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77 lineno, sourceline)
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78 return item
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79
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80 def GetSubList(self):
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81 frame, lineno = self.info
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82 sublist = []
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83 if frame.f_globals is not frame.f_locals:
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84 item = VariablesTreeItem("<locals>", frame.f_locals, self.flist)
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85 sublist.append(item)
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86 item = VariablesTreeItem("<globals>", frame.f_globals, self.flist)
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87 sublist.append(item)
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88 return sublist
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89
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90 def OnDoubleClick(self):
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91 if self.flist:
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92 frame, lineno = self.info
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93 filename = frame.f_code.co_filename
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94 if os.path.isfile(filename):
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95 self.flist.gotofileline(filename, lineno)
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96
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97 class VariablesTreeItem(ObjectTreeItem):
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98
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99 def GetText(self):
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100 return self.labeltext
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101
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102 def GetLabelText(self):
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103 return None
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104
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105 def IsExpandable(self):
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106 return len(self.object) > 0
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107
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108 def keys(self):
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109 return list(self.object.keys())
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110
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111 def GetSubList(self):
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112 sublist = []
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113 for key in self.keys():
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114 try:
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115 value = self.object[key]
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116 except KeyError:
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117 continue
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118 def setfunction(value, key=key, object=self.object):
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119 object[key] = value
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120 item = make_objecttreeitem(key + " =", value, setfunction)
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121 sublist.append(item)
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122 return sublist