Mercurial > cpython-lru_cache-weakref

annotate Tools/scripts/findnocoding.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 2dfe8262093c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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fcfe324663a6 convert shebang lines: python -> python3
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1 #!/usr/bin/env python3
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2
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3 """List all those Python files that require a coding directive
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4
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5 Usage: findnocoding.py dir1 [dir2...]
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6 """
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7
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8 __author__ = "Oleg Broytmann, Georg Brandl"
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9
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10 import sys, os, re, getopt
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11
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12 # our pysource module finds Python source files
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13 try:
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14 import pysource
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15 except ImportError:
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16 # emulate the module with a simple os.walk
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17 class pysource:
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18 has_python_ext = looks_like_python = can_be_compiled = None
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19 def walk_python_files(self, paths, *args, **kwargs):
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20 for path in paths:
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21 if os.path.isfile(path):
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22 yield path.endswith(".py")
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23 elif os.path.isdir(path):
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24 for root, dirs, files in os.walk(path):
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25 for filename in files:
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26 if filename.endswith(".py"):
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27 yield os.path.join(root, filename)
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28 pysource = pysource()
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29
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30
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31 print("The pysource module is not available; "
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32 "no sophisticated Python source file search will be done.", file=sys.stderr)
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33
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34
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35 decl_re = re.compile(rb'^[ \t\f]*#.*coding[:=][ \t]*([-\w.]+)')
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36
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37 def get_declaration(line):
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38 match = decl_re.match(line)
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39 if match:
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40 return match.group(1)
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41 return b''
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42
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43 def has_correct_encoding(text, codec):
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44 try:
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45 str(text, codec)
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46 except UnicodeDecodeError:
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47 return False
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48 else:
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49 return True
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50
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51 def needs_declaration(fullpath):
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52 try:
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53 infile = open(fullpath, 'rb')
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54 except IOError: # Oops, the file was removed - ignore it
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55 return None
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56
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57 with infile:
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58 line1 = infile.readline()
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59 line2 = infile.readline()
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60
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61 if get_declaration(line1) or get_declaration(line2):
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62 # the file does have an encoding declaration, so trust it
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63 return False
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64
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65 # check the whole file for non utf-8 characters
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66 rest = infile.read()
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67
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68 if has_correct_encoding(line1+line2+rest, "utf-8"):
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69 return False
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70
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71 return True
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72
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73
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74 usage = """Usage: %s [-cd] paths...
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75 -c: recognize Python source files trying to compile them
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76 -d: debug output""" % sys.argv[0]
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77
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78 if __name__ == '__main__':
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79
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80 try:
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81 opts, args = getopt.getopt(sys.argv[1:], 'cd')
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82 except getopt.error as msg:
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83 print(msg, file=sys.stderr)
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84 print(usage, file=sys.stderr)
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85 sys.exit(1)
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86
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87 is_python = pysource.looks_like_python
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88 debug = False
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89
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90 for o, a in opts:
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91 if o == '-c':
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92 is_python = pysource.can_be_compiled
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93 elif o == '-d':
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94 debug = True
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95
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96 if not args:
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97 print(usage, file=sys.stderr)
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98 sys.exit(1)
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99
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100 for fullpath in pysource.walk_python_files(args, is_python):
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101 if debug:
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102 print("Testing for coding: %s" % fullpath)
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103 result = needs_declaration(fullpath)
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104 if result:
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105 print(fullpath)