Mercurial > cpython-lru_cache-weakref

annotate Demo/scripts/pp.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 32c35f9b245c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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73758db2f464 /usr/local/bin/python -> /usr/bin/env python
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1 #! /usr/bin/env python
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2
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3 # Emulate some Perl command line options.
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4 # Usage: pp [-a] [-c] [-d] [-e scriptline] [-F fieldsep] [-n] [-p] [file] ...
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5 # Where the options mean the following:
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6 # -a : together with -n or -p, splits each line into list F
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7 # -c : check syntax only, do not execute any code
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8 # -d : run the script under the debugger, pdb
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9 # -e scriptline : gives one line of the Python script; may be repeated
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10 # -F fieldsep : sets the field separator for the -a option [not in Perl]
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11 # -n : runs the script for each line of input
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12 # -p : prints the line after the script has run
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13 # When no script lines have been passed, the first file argument
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14 # contains the script. With -n or -p, the remaining arguments are
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15 # read as input to the script, line by line. If a file is '-'
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16 # or missing, standard input is read.
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17
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18 # XXX To do:
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19 # - add -i extension option (change files in place)
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20 # - make a single loop over the files and lines (changes effect of 'break')?
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21 # - add an option to specify the record separator
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22 # - except for -n/-p, run directly from the file if at all possible
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23
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24 import sys
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25 import getopt
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26
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27 FS = ''
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28 SCRIPT = []
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29 AFLAG = 0
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30 CFLAG = 0
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31 DFLAG = 0
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32 NFLAG = 0
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33 PFLAG = 0
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34
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35 try:
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36 optlist, ARGS = getopt.getopt(sys.argv[1:], 'acde:F:np')
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37 except getopt.error, msg:
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38 sys.stderr.write('%s: %s\n' % (sys.argv[0], msg))
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39 sys.exit(2)
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40
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41 for option, optarg in optlist:
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42 if option == '-a':
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43 AFLAG = 1
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44 elif option == '-c':
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45 CFLAG = 1
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46 elif option == '-d':
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47 DFLAG = 1
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48 elif option == '-e':
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49 for line in optarg.split('\n'):
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50 SCRIPT.append(line)
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51 elif option == '-F':
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52 FS = optarg
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53 elif option == '-n':
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54 NFLAG = 1
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55 PFLAG = 0
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56 elif option == '-p':
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57 NFLAG = 1
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58 PFLAG = 1
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59 else:
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60 print option, 'not recognized???'
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61
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62 if not ARGS: ARGS.append('-')
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63
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64 if not SCRIPT:
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65 if ARGS[0] == '-':
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66 fp = sys.stdin
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67 else:
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68 fp = open(ARGS[0], 'r')
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69 while 1:
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70 line = fp.readline()
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71 if not line: break
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72 SCRIPT.append(line[:-1])
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73 del fp
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74 del ARGS[0]
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75 if not ARGS: ARGS.append('-')
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76
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77 if CFLAG:
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78 prologue = ['if 0:']
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79 epilogue = []
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80 elif NFLAG:
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81 # Note that it is on purpose that AFLAG and PFLAG are
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82 # tested dynamically each time through the loop
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83 prologue = [
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84 'LINECOUNT = 0',
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85 'for FILE in ARGS:',
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86 ' \tif FILE == \'-\':',
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87 ' \t \tFP = sys.stdin',
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88 ' \telse:',
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89 ' \t \tFP = open(FILE, \'r\')',
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90 ' \tLINENO = 0',
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91 ' \twhile 1:',
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92 ' \t \tLINE = FP.readline()',
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93 ' \t \tif not LINE: break',
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94 ' \t \tLINENO = LINENO + 1',
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95 ' \t \tLINECOUNT = LINECOUNT + 1',
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96 ' \t \tL = LINE[:-1]',
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97 ' \t \taflag = AFLAG',
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98 ' \t \tif aflag:',
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99 ' \t \t \tif FS: F = L.split(FS)',
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100 ' \t \t \telse: F = L.split()'
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101 ]
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102 epilogue = [
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103 ' \t \tif not PFLAG: continue',
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104 ' \t \tif aflag:',
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105 ' \t \t \tif FS: print FS.join(F)',
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106 ' \t \t \telse: print \' \'.join(F)',
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107 ' \t \telse: print L',
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108 ]
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109 else:
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110 prologue = ['if 1:']
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111 epilogue = []
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112
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113 # Note that we indent using tabs only, so that any indentation style
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114 # used in 'command' will come out right after re-indentation.
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115
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116 program = '\n'.join(prologue) + '\n'
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117 for line in SCRIPT:
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118 program += ' \t \t' + line + '\n'
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119 program += '\n'.join(epilogue) + '\n'
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120
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121 import tempfile
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122 fp = tempfile.NamedTemporaryFile()
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123 fp.write(program)
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124 fp.flush()
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125 if DFLAG:
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126 import pdb
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127 pdb.run('execfile(%r)' % (fp.name,))
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128 else:
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129 execfile(fp.name)