gh-pages
Last change
on this file since d1fe925 was
d1fe925,
checked in by ajj, 8 years ago
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Creating gh_pages branch for docs
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100644
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File size:
1.2 KB
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[d1fe925] | 1 | """ |
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| 2 | Utility to add annotations to python exceptions. |
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| 3 | """ |
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| 4 | |
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| 5 | # Platform cruft: WindowsError is only defined on Windows. |
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| 6 | try: |
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| 7 | WindowsError |
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| 8 | except NameError: |
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| 9 | class WindowsError(Exception): |
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| 10 | pass |
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| 11 | |
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| 12 | def annotate_exception(exc, msg): |
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| 13 | """ |
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| 14 | Add an annotation to the current exception, which can then be forwarded |
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| 15 | to the caller using a bare "raise" statement to reraise the annotated |
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| 16 | exception. |
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| 17 | Example:: |
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| 18 | >>> D = {} |
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| 19 | >>> try: |
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| 20 | ... print D['hello'] |
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| 21 | ... except Exception,exc: |
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| 22 | ... annotate_exception(exc, "while accessing 'D'") |
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| 23 | ... raise |
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| 24 | Traceback (most recent call last): |
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| 25 | ... |
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| 26 | KeyError: "hello while accessing 'D'" |
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| 27 | """ |
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| 28 | # Can't extend WindowsError exceptions; instead raise a new exception. |
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| 29 | # TODO: try to incorporate current stack trace in the raised exception |
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| 30 | if isinstance(exc, WindowsError): |
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| 31 | raise OSError(str(exc)+msg) |
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| 32 | |
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| 33 | args = exc.args |
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| 34 | if not args: |
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| 35 | exc.args = (msg,) |
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| 36 | else: |
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| 37 | try: |
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| 38 | arg0 = " ".join((args[0],msg)) |
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| 39 | exc.args = tuple([arg0] + list(args[1:])) |
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| 40 | except: |
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| 41 | exc.args = (" ".join((str(exc),msg)),) |
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