author | martin.trojer@nokia.com |
Fri, 31 Jul 2009 15:01:17 +0100 | |
changeset 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
1
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
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1 |
"""Utilities for with-statement contexts. See PEP 343.""" |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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2 |
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2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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3 |
import sys |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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4 |
from functools import wraps |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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5 |
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2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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6 |
__all__ = ["contextmanager", "nested", "closing"] |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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7 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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8 |
class GeneratorContextManager(object): |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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9 |
"""Helper for @contextmanager decorator.""" |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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10 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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11 |
def __init__(self, gen): |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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self.gen = gen |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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13 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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14 |
def __enter__(self): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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15 |
try: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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16 |
return self.gen.next() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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17 |
except StopIteration: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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18 |
raise RuntimeError("generator didn't yield") |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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19 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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def __exit__(self, type, value, traceback): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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if type is None: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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try: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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self.gen.next() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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except StopIteration: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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return |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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26 |
else: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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raise RuntimeError("generator didn't stop") |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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else: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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if value is None: |
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# Need to force instantiation so we can reliably |
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# tell if we get the same exception back |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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value = type() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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try: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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self.gen.throw(type, value, traceback) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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raise RuntimeError("generator didn't stop after throw()") |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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except StopIteration, exc: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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# Suppress the exception *unless* it's the same exception that |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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# was passed to throw(). This prevents a StopIteration |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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# raised inside the "with" statement from being suppressed |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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return exc is not value |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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except: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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# only re-raise if it's *not* the exception that was |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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# passed to throw(), because __exit__() must not raise |
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# an exception unless __exit__() itself failed. But throw() |
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# has to raise the exception to signal propagation, so this |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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# fixes the impedance mismatch between the throw() protocol |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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# and the __exit__() protocol. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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# |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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if sys.exc_info()[1] is not value: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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raise |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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51 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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52 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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53 |
def contextmanager(func): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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"""@contextmanager decorator. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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55 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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Typical usage: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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57 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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58 |
@contextmanager |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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def some_generator(<arguments>): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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60 |
<setup> |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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61 |
try: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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yield <value> |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
63 |
finally: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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|
64 |
<cleanup> |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
65 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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66 |
This makes this: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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67 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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68 |
with some_generator(<arguments>) as <variable>: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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69 |
<body> |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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|
70 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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equivalent to this: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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72 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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73 |
<setup> |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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74 |
try: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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75 |
<variable> = <value> |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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76 |
<body> |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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|
77 |
finally: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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78 |
<cleanup> |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
79 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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80 |
""" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
81 |
@wraps(func) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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82 |
def helper(*args, **kwds): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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83 |
return GeneratorContextManager(func(*args, **kwds)) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
84 |
return helper |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
85 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
86 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
87 |
@contextmanager |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
88 |
def nested(*managers): |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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|
89 |
"""Support multiple context managers in a single with-statement. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
90 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
91 |
Code like this: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
92 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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93 |
with nested(A, B, C) as (X, Y, Z): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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94 |
<body> |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
95 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
96 |
is equivalent to this: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
97 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
98 |
with A as X: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
99 |
with B as Y: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
100 |
with C as Z: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
101 |
<body> |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
102 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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103 |
""" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
104 |
exits = [] |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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105 |
vars = [] |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
106 |
exc = (None, None, None) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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107 |
try: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
108 |
for mgr in managers: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
109 |
exit = mgr.__exit__ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
110 |
enter = mgr.__enter__ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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|
111 |
vars.append(enter()) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
112 |
exits.append(exit) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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113 |
yield vars |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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114 |
except: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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115 |
exc = sys.exc_info() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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116 |
finally: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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117 |
while exits: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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118 |
exit = exits.pop() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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119 |
try: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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120 |
if exit(*exc): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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121 |
exc = (None, None, None) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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122 |
except: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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123 |
exc = sys.exc_info() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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124 |
if exc != (None, None, None): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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125 |
# Don't rely on sys.exc_info() still containing |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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126 |
# the right information. Another exception may |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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127 |
# have been raised and caught by an exit method |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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128 |
raise exc[0], exc[1], exc[2] |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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129 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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130 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
131 |
class closing(object): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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132 |
"""Context to automatically close something at the end of a block. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
133 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
134 |
Code like this: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
135 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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changeset
|
136 |
with closing(<module>.open(<arguments>)) as f: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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|
137 |
<block> |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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changeset
|
138 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
139 |
is equivalent to this: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
140 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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|
141 |
f = <module>.open(<arguments>) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
142 |
try: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
143 |
<block> |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
144 |
finally: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
145 |
f.close() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
146 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
147 |
""" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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|
148 |
def __init__(self, thing): |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
149 |
self.thing = thing |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
150 |
def __enter__(self): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
151 |
return self.thing |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
152 |
def __exit__(self, *exc_info): |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
153 |
self.thing.close() |