annotate Lib/importlib/test/source/util.py @ 78069:a8aa77458e12 3.2

Add c_size_t and c_ssize_t to the ctypes summary table.
author Antoine Pitrou <solipsis@pitrou.net>
date Thu, 12 Jul 2012 20:31:50 +0200
parents 3c9232a684ae
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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d85ef26efd10 Rename importlib.test.support to importlib.test.util.
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1 from .. import util
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2 import contextlib
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3 import errno
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4 import functools
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5 import imp
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6 import os
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7 import os.path
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8 import sys
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9 import tempfile
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10 from test import support
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11
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12
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13 def writes_bytecode_files(fxn):
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14 """Decorator to protect sys.dont_write_bytecode from mutation and to skip
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15 tests that require it to be set to False."""
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16 if sys.dont_write_bytecode:
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17 return lambda *args, **kwargs: None
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18 @functools.wraps(fxn)
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19 def wrapper(*args, **kwargs):
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20 original = sys.dont_write_bytecode
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21 sys.dont_write_bytecode = False
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22 try:
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23 to_return = fxn(*args, **kwargs)
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24 finally:
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25 sys.dont_write_bytecode = original
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26 return to_return
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27 return wrapper
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28
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29
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30 def ensure_bytecode_path(bytecode_path):
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31 """Ensure that the __pycache__ directory for PEP 3147 pyc file exists.
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32
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33 :param bytecode_path: File system path to PEP 3147 pyc file.
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34 """
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35 try:
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36 os.mkdir(os.path.dirname(bytecode_path))
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37 except OSError as error:
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38 if error.errno != errno.EEXIST:
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39 raise
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40
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41
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42 @contextlib.contextmanager
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43 def create_modules(*names):
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44 """Temporarily create each named module with an attribute (named 'attr')
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45 that contains the name passed into the context manager that caused the
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46 creation of the module.
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47
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48 All files are created in a temporary directory returned by
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49 tempfile.mkdtemp(). This directory is inserted at the beginning of
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50 sys.path. When the context manager exits all created files (source and
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51 bytecode) are explicitly deleted.
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52
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53 No magic is performed when creating packages! This means that if you create
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54 a module within a package you must also create the package's __init__ as
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55 well.
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56
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57 """
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58 source = 'attr = {0!r}'
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59 created_paths = []
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60 mapping = {}
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61 state_manager = None
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62 uncache_manager = None
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63 try:
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64 temp_dir = tempfile.mkdtemp()
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65 mapping['.root'] = temp_dir
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66 import_names = set()
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67 for name in names:
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68 if not name.endswith('__init__'):
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69 import_name = name
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70 else:
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71 import_name = name[:-len('.__init__')]
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72 import_names.add(import_name)
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73 if import_name in sys.modules:
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74 del sys.modules[import_name]
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75 name_parts = name.split('.')
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76 file_path = temp_dir
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77 for directory in name_parts[:-1]:
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78 file_path = os.path.join(file_path, directory)
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79 if not os.path.exists(file_path):
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80 os.mkdir(file_path)
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81 created_paths.append(file_path)
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82 file_path = os.path.join(file_path, name_parts[-1] + '.py')
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83 with open(file_path, 'w') as file:
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84 file.write(source.format(name))
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85 created_paths.append(file_path)
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86 mapping[name] = file_path
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87 uncache_manager = util.uncache(*import_names)
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88 uncache_manager.__enter__()
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89 state_manager = util.import_state(path=[temp_dir])
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90 state_manager.__enter__()
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91 yield mapping
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92 finally:
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93 if state_manager is not None:
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94 state_manager.__exit__(None, None, None)
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95 if uncache_manager is not None:
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96 uncache_manager.__exit__(None, None, None)
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97 support.rmtree(temp_dir)