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annotate Python/freeze_importlib.py @ 76303:2dd046be2c88

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Issue #2377: Make importlib the implementation of __import__(). importlib._bootstrap is now frozen into Python/importlib.h and stored as _frozen_importlib in sys.modules. Py_Initialize() loads the frozen code along with sys and imp and then uses _frozen_importlib._install() to set builtins.__import__() w/ _frozen_importlib.__import__().
author Brett Cannon <brett@python.org>
date Sat, 14 Apr 2012 14:10:13 -0400
parents
children c3b823e8dcd3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
76303
2dd046be2c88 Issue #2377: Make importlib the implementation of __import__().
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1 #! /usr/bin/env python
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2 """Freeze importlib for use as the implementation of import."""
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3 import marshal
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4
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5
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6 header = """/* Auto-generated by Python/freeze_importlib.py */"""
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7
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8
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9 def main(input_path, output_path):
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10 with open(input_path, 'r', encoding='utf-8') as input_file:
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11 source = input_file.read()
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12
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13 code = compile(source, '<frozen importlib._bootstrap>', 'exec')
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14
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15 lines = [header]
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16 lines.append('unsigned char _Py_M__importlib[] = {')
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17 data = marshal.dumps(code)
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18 # Code from Tools/freeze/makefreeze.py:writecode()
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19 for i in range(0, len(data), 16):
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20 line = [' ']
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21 for c in data[i:i+16]:
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22 line.append('%d,' % c)
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23 lines.append(''.join(line))
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24 lines.append('};\n')
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25 with open(output_path, 'w') as output_file:
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26 output_file.write('\n'.join(lines))
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27
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29 if __name__ == '__main__':
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30 import sys
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31
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32 args = sys.argv[1:]
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33 if len(args) != 2:
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34 print('Need to specify input and output file paths', file=sys.stderr)
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35 sys.exit(1)
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36
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37 main(*args)