Mercurial > cpython-lru_cache-weakref

annotate Tools/scripts/pickle2db.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 fcfe324663a6
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python3
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2
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3 """
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4 Synopsis: %(prog)s [-h|-b|-g|-r|-a|-d] [ picklefile ] dbfile
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5
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6 Read the given picklefile as a series of key/value pairs and write to a new
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7 database. If the database already exists, any contents are deleted. The
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8 optional flags indicate the type of the output database:
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9
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10 -a - open using dbm (open any supported format)
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11 -b - open as bsddb btree file
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12 -d - open as dbm.ndbm file
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13 -g - open as dbm.gnu file
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14 -h - open as bsddb hash file
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15 -r - open as bsddb recno file
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16
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17 The default is hash. If a pickle file is named it is opened for read
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18 access. If no pickle file is named, the pickle input is read from standard
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19 input.
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20
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21 Note that recno databases can only contain integer keys, so you can't dump a
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22 hash or btree database using db2pickle.py and reconstitute it to a recno
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23 database with %(prog)s unless your keys are integers.
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24
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25 """
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26
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27 import getopt
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28 try:
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29 import bsddb
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30 except ImportError:
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31 bsddb = None
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32 try:
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33 import dbm.ndbm as dbm
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34 except ImportError:
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35 dbm = None
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36 try:
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37 import dbm.gnu as gdbm
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38 except ImportError:
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39 gdbm = None
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40 try:
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41 import dbm.ndbm as anydbm
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42 except ImportError:
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43 anydbm = None
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44 import sys
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45 try:
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46 import pickle as pickle
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47 except ImportError:
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48 import pickle
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49
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50 prog = sys.argv[0]
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51
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52 def usage():
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53 sys.stderr.write(__doc__ % globals())
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54
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55 def main(args):
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56 try:
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57 opts, args = getopt.getopt(args, "hbrdag",
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58 ["hash", "btree", "recno", "dbm", "anydbm",
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59 "gdbm"])
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60 except getopt.error:
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61 usage()
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62 return 1
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63
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64 if len(args) == 0 or len(args) > 2:
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65 usage()
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66 return 1
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67 elif len(args) == 1:
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68 pfile = sys.stdin
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69 dbfile = args[0]
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70 else:
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71 try:
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72 pfile = open(args[0], 'rb')
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73 except IOError:
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74 sys.stderr.write("Unable to open %s\n" % args[0])
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75 return 1
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76 dbfile = args[1]
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77
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78 dbopen = None
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79 for opt, arg in opts:
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80 if opt in ("-h", "--hash"):
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81 try:
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82 dbopen = bsddb.hashopen
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83 except AttributeError:
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84 sys.stderr.write("bsddb module unavailable.\n")
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85 return 1
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86 elif opt in ("-b", "--btree"):
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87 try:
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88 dbopen = bsddb.btopen
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89 except AttributeError:
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90 sys.stderr.write("bsddb module unavailable.\n")
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91 return 1
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92 elif opt in ("-r", "--recno"):
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93 try:
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94 dbopen = bsddb.rnopen
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95 except AttributeError:
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96 sys.stderr.write("bsddb module unavailable.\n")
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97 return 1
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98 elif opt in ("-a", "--anydbm"):
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99 try:
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100 dbopen = anydbm.open
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101 except AttributeError:
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102 sys.stderr.write("dbm module unavailable.\n")
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103 return 1
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104 elif opt in ("-g", "--gdbm"):
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105 try:
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106 dbopen = gdbm.open
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107 except AttributeError:
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108 sys.stderr.write("dbm.gnu module unavailable.\n")
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109 return 1
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110 elif opt in ("-d", "--dbm"):
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111 try:
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112 dbopen = dbm.open
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113 except AttributeError:
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114 sys.stderr.write("dbm.ndbm module unavailable.\n")
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115 return 1
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116 if dbopen is None:
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117 if bsddb is None:
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118 sys.stderr.write("bsddb module unavailable - ")
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119 sys.stderr.write("must specify dbtype.\n")
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120 return 1
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121 else:
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122 dbopen = bsddb.hashopen
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123
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124 try:
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125 db = dbopen(dbfile, 'c')
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126 except bsddb.error:
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127 sys.stderr.write("Unable to open %s. " % dbfile)
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128 sys.stderr.write("Check for format or version mismatch.\n")
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129 return 1
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130 else:
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131 for k in list(db.keys()):
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132 del db[k]
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133
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134 while 1:
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135 try:
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136 (key, val) = pickle.load(pfile)
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137 except EOFError:
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138 break
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139 db[key] = val
7bf7dac4dc49 convert pickles generated by db2pickle.py back to database files
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140
7bf7dac4dc49 convert pickles generated by db2pickle.py back to database files
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141 db.close()
7bf7dac4dc49 convert pickles generated by db2pickle.py back to database files
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142 pfile.close()
7bf7dac4dc49 convert pickles generated by db2pickle.py back to database files
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143
7bf7dac4dc49 convert pickles generated by db2pickle.py back to database files
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144 return 0
7bf7dac4dc49 convert pickles generated by db2pickle.py back to database files
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145
7bf7dac4dc49 convert pickles generated by db2pickle.py back to database files
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146 if __name__ == "__main__":
7bf7dac4dc49 convert pickles generated by db2pickle.py back to database files
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147 sys.exit(main(sys.argv[1:]))