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Merged revisions 78207 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r78207 | ezio.melotti | 2010-02-17 01:26:09 +0200 (Wed, 17 Feb 2010) | 1 line #7930: fix stripid ........
author Ezio Melotti <ezio.melotti@gmail.com>
date Tue, 16 Feb 2010 23:29:44 +0000
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1 :mod:`email`: Exception and Defect classes
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2 ------------------------------------------
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3
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4 .. module:: email.errors
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5 :synopsis: The exception classes used by the email package.
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6
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7
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8 The following exception classes are defined in the :mod:`email.errors` module:
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9
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10
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11 .. exception:: MessageError()
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12
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13 This is the base class for all exceptions that the :mod:`email` package can
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14 raise. It is derived from the standard :exc:`Exception` class and defines no
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15 additional methods.
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16
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17
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18 .. exception:: MessageParseError()
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19
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20 This is the base class for exceptions thrown by the :class:`~email.parser.Parser`
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21 class. It is derived from :exc:`MessageError`.
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22
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23
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24 .. exception:: HeaderParseError()
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25
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26 Raised under some error conditions when parsing the :rfc:`2822` headers of a
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27 message, this class is derived from :exc:`MessageParseError`. It can be raised
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28 from the :meth:`Parser.parse` or :meth:`Parser.parsestr` methods.
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29
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30 Situations where it can be raised include finding an envelope header after the
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31 first :rfc:`2822` header of the message, finding a continuation line before the
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32 first :rfc:`2822` header is found, or finding a line in the headers which is
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33 neither a header or a continuation line.
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34
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35
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36 .. exception:: BoundaryError()
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37
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38 Raised under some error conditions when parsing the :rfc:`2822` headers of a
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39 message, this class is derived from :exc:`MessageParseError`. It can be raised
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40 from the :meth:`Parser.parse` or :meth:`Parser.parsestr` methods.
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41
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42 Situations where it can be raised include not being able to find the starting or
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43 terminating boundary in a :mimetype:`multipart/\*` message when strict parsing
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44 is used.
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45
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46
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47 .. exception:: MultipartConversionError()
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48
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49 Raised when a payload is added to a :class:`Message` object using
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50 :meth:`add_payload`, but the payload is already a scalar and the message's
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51 :mailheader:`Content-Type` main type is not either :mimetype:`multipart` or
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52 missing. :exc:`MultipartConversionError` multiply inherits from
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53 :exc:`MessageError` and the built-in :exc:`TypeError`.
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54
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55 Since :meth:`Message.add_payload` is deprecated, this exception is rarely raised
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56 in practice. However the exception may also be raised if the :meth:`attach`
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57 method is called on an instance of a class derived from
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58 :class:`~email.mime.nonmultipart.MIMENonMultipart` (e.g.
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59 :class:`~email.mime.image.MIMEImage`).
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61 Here's the list of the defects that the :class:`~email.mime.parser.FeedParser`
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62 can find while parsing messages. Note that the defects are added to the message
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63 where the problem was found, so for example, if a message nested inside a
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64 :mimetype:`multipart/alternative` had a malformed header, that nested message
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65 object would have a defect, but the containing messages would not.
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66
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67 All defect classes are subclassed from :class:`email.errors.MessageDefect`, but
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68 this class is *not* an exception!
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69
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70 .. versionadded:: 2.4
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71 All the defect classes were added.
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72
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73 * :class:`NoBoundaryInMultipartDefect` -- A message claimed to be a multipart,
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74 but had no :mimetype:`boundary` parameter.
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75
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76 * :class:`StartBoundaryNotFoundDefect` -- The start boundary claimed in the
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77 :mailheader:`Content-Type` header was never found.
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78
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79 * :class:`FirstHeaderLineIsContinuationDefect` -- The message had a continuation
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80 line as its first header line.
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81
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82 * :class:`MisplacedEnvelopeHeaderDefect` - A "Unix From" header was found in the
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83 middle of a header block.
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84
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85 * :class:`MalformedHeaderDefect` -- A header was found that was missing a colon,
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86 or was otherwise malformed.
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87
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88 * :class:`MultipartInvariantViolationDefect` -- A message claimed to be a
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89 :mimetype:`multipart`, but no subparts were found. Note that when a message has
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90 this defect, its :meth:`is_multipart` method may return false even though its
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91 content type claims to be :mimetype:`multipart`.
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92