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55 | <H2><A NAME="SECTION0014280000000000000000"> | |
56 | 12.2.8 Exception and Defect classes</A> | |
57 | </H2> | |
58 | <A NAME="module-email.Errors"></A> | |
59 | ||
60 | <P> | |
61 | The following exception classes are defined in the | |
62 | <tt class="module">email.Errors</tt> module: | |
63 | ||
64 | <P> | |
65 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
66 | <td><nobr><b><span class="typelabel">exception</span> <tt id='l2h-3936' xml:id='l2h-3936' class="exception">MessageError</tt></b>(</nobr></td> | |
67 | <td><var></var>)</td></tr></table></dt> | |
68 | <dd> | |
69 | This is the base class for all exceptions that the <tt class="module">email</tt> | |
70 | package can raise. It is derived from the standard | |
71 | <tt class="exception">Exception</tt> class and defines no additional methods. | |
72 | </dl> | |
73 | ||
74 | <P> | |
75 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
76 | <td><nobr><b><span class="typelabel">exception</span> <tt id='l2h-3937' xml:id='l2h-3937' class="exception">MessageParseError</tt></b>(</nobr></td> | |
77 | <td><var></var>)</td></tr></table></dt> | |
78 | <dd> | |
79 | This is the base class for exceptions thrown by the <tt class="class">Parser</tt> | |
80 | class. It is derived from <tt class="exception">MessageError</tt>. | |
81 | </dl> | |
82 | ||
83 | <P> | |
84 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
85 | <td><nobr><b><span class="typelabel">exception</span> <tt id='l2h-3938' xml:id='l2h-3938' class="exception">HeaderParseError</tt></b>(</nobr></td> | |
86 | <td><var></var>)</td></tr></table></dt> | |
87 | <dd> | |
88 | Raised under some error conditions when parsing the <a class="rfc" id='rfcref-90944' xml:id='rfcref-90944' | |
89 | href="http://www.faqs.org/rfcs/rfc2822.html">RFC 2822</a> headers of | |
90 | a message, this class is derived from <tt class="exception">MessageParseError</tt>. | |
91 | It can be raised from the <tt class="method">Parser.parse()</tt> or | |
92 | <tt class="method">Parser.parsestr()</tt> methods. | |
93 | ||
94 | <P> | |
95 | Situations where it can be raised include finding an envelope | |
96 | header after the first <a class="rfc" id='rfcref-90946' xml:id='rfcref-90946' | |
97 | href="http://www.faqs.org/rfcs/rfc2822.html">RFC 2822</a> header of the message, finding a | |
98 | continuation line before the first <a class="rfc" id='rfcref-90948' xml:id='rfcref-90948' | |
99 | href="http://www.faqs.org/rfcs/rfc2822.html">RFC 2822</a> header is found, or finding | |
100 | a line in the headers which is neither a header or a continuation | |
101 | line. | |
102 | </dl> | |
103 | ||
104 | <P> | |
105 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
106 | <td><nobr><b><span class="typelabel">exception</span> <tt id='l2h-3939' xml:id='l2h-3939' class="exception">BoundaryError</tt></b>(</nobr></td> | |
107 | <td><var></var>)</td></tr></table></dt> | |
108 | <dd> | |
109 | Raised under some error conditions when parsing the <a class="rfc" id='rfcref-90950' xml:id='rfcref-90950' | |
110 | href="http://www.faqs.org/rfcs/rfc2822.html">RFC 2822</a> headers of | |
111 | a message, this class is derived from <tt class="exception">MessageParseError</tt>. | |
112 | It can be raised from the <tt class="method">Parser.parse()</tt> or | |
113 | <tt class="method">Parser.parsestr()</tt> methods. | |
114 | ||
115 | <P> | |
116 | Situations where it can be raised include not being able to find the | |
117 | starting or terminating boundary in a <span class="mimetype">multipart/*</span> message | |
118 | when strict parsing is used. | |
119 | </dl> | |
120 | ||
121 | <P> | |
122 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
123 | <td><nobr><b><span class="typelabel">exception</span> <tt id='l2h-3940' xml:id='l2h-3940' class="exception">MultipartConversionError</tt></b>(</nobr></td> | |
124 | <td><var></var>)</td></tr></table></dt> | |
125 | <dd> | |
126 | Raised when a payload is added to a <tt class="class">Message</tt> object using | |
127 | <tt class="method">add_payload()</tt>, but the payload is already a scalar and the | |
128 | message's <span class="mailheader">Content-Type:</span> main type is not either | |
129 | <span class="mimetype">multipart</span> or missing. <tt class="exception">MultipartConversionError</tt> | |
130 | multiply inherits from <tt class="exception">MessageError</tt> and the built-in | |
131 | <tt class="exception">TypeError</tt>. | |
132 | ||
133 | <P> | |
134 | Since <tt class="method">Message.add_payload()</tt> is deprecated, this exception is | |
135 | rarely raised in practice. However the exception may also be raised | |
136 | if the <tt class="method">attach()</tt> method is called on an instance of a class | |
137 | derived from <tt class="class">MIMENonMultipart</tt> (e.g. <tt class="class">MIMEImage</tt>). | |
138 | </dl> | |
139 | ||
140 | <P> | |
141 | Here's the list of the defects that the <tt class="class">FeedParser</tt> can find while | |
142 | parsing messages. Note that the defects are added to the message where the | |
143 | problem was found, so for example, if a message nested inside a | |
144 | <span class="mimetype">multipart/alternative</span> had a malformed header, that nested message | |
145 | object would have a defect, but the containing messages would not. | |
146 | ||
147 | <P> | |
148 | All defect classes are subclassed from <tt class="class">email.Errors.MessageDefect</tt>, but | |
149 | this class is <em>not</em> an exception! | |
150 | ||
151 | <P> | |
152 | ||
153 | <span class="versionnote">New in version 2.4: | |
154 | All the defect classes were added.</span> | |
155 | ||
156 | <P> | |
157 | ||
158 | <UL> | |
159 | <LI><tt class="class">NoBoundaryInMultipartDefect</tt> - A message claimed to be a | |
160 | multipart, but had no <span class="mimetype">boundary</span> parameter. | |
161 | ||
162 | <P> | |
163 | </LI> | |
164 | <LI><tt class="class">StartBoundaryNotFoundDefect</tt> - The start boundary claimed in the | |
165 | <span class="mailheader">Content-Type:</span> header was never found. | |
166 | ||
167 | <P> | |
168 | </LI> | |
169 | <LI><tt class="class">FirstHeaderLineIsContinuationDefect</tt> - The message had a | |
170 | continuation line as its first header line. | |
171 | ||
172 | <P> | |
173 | </LI> | |
174 | <LI><tt class="class">MisplacedEnvelopeHeaderDefect</tt> - A ``Unix From'' header was found | |
175 | in the middle of a header block. | |
176 | ||
177 | <P> | |
178 | </LI> | |
179 | <LI><tt class="class">MalformedHeaderDefect</tt> - A header was found that was missing a | |
180 | colon, or was otherwise malformed. | |
181 | ||
182 | <P> | |
183 | </LI> | |
184 | <LI><tt class="class">MultipartInvariantViolationDefect</tt> - A message claimed to be a | |
185 | <span class="mimetype">multipart</span>, but no subparts were found. Note that when a | |
186 | message has this defect, its <tt class="method">is_multipart()</tt> method may return | |
187 | false even though its content type claims to be <span class="mimetype">multipart</span>. | |
188 | </LI> | |
189 | </UL> | |
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