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<title>5.2.6.2 Example Objects
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<H3><A NAME=
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"doctest-Example"></A>
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<td><nobr><b><span class=
"typelabel">class
</span> <tt id='l2h-
1087' xml:id='l2h-
1087'
class=
"class">Example
</tt></b>(
</nobr></td>
<td><var>source, want
</var><big>[
</big><var>,
exc_msg
</var><big>]
</big><var></var><big>[
</big><var>, lineno
</var><big>]
</big><var></var><big>[
</big><var>,
indent
</var><big>]
</big><var></var><big>[
</big><var>, options
</var><big>]
</big><var></var>)
</td></tr></table></dt>
A single interactive example, consisting of a Python statement and
its expected output. The constructor arguments are used to
initialize the member variables of the same names.
<span class=
"versionnote">New in version
2.4.
</span>
<tt class=
"class">Example
</tt> defines the following member variables. They are
initialized by the constructor, and should not be modified directly.
<dl><dt><b><tt id='l2h-
1088' xml:id='l2h-
1088'
class=
"member">source
</tt></b></dt>
A string containing the example's source code. This source code
consists of a single Python statement, and always ends with a
newline; the constructor adds a newline when necessary.
<dl><dt><b><tt id='l2h-
1089' xml:id='l2h-
1089'
class=
"member">want
</tt></b></dt>
The expected output from running the example's source code (either
from stdout, or a traceback in case of exception).
<tt class=
"member">want
</tt>
ends with a newline unless no output is expected, in which case
it's an empty string. The constructor adds a newline when
<dl><dt><b><tt id='l2h-
1090' xml:id='l2h-
1090'
class=
"member">exc_msg
</tt></b></dt>
The exception message generated by the example, if the example is
expected to generate an exception; or
<code>None
</code> if it is not
expected to generate an exception. This exception message is
compared against the return value of
<tt class=
"function">traceback.format_exception_only()
</tt>.
<tt class=
"member">exc_msg
</tt>
ends with a newline unless it's
<code>None
</code>. The constructor adds
<dl><dt><b><tt id='l2h-
1091' xml:id='l2h-
1091'
class=
"member">lineno
</tt></b></dt>
The line number within the string containing this example where
the example begins. This line number is zero-based with respect
to the beginning of the containing string.
<dl><dt><b><tt id='l2h-
1092' xml:id='l2h-
1092'
class=
"member">indent
</tt></b></dt>
The example's indentation in the containing string, i.e., the
number of space characters that precede the example's first
<dl><dt><b><tt id='l2h-
1093' xml:id='l2h-
1093'
class=
"member">options
</tt></b></dt>
A dictionary mapping from option flags to
<code>True
</code> or
<code>False
</code>, which is used to override default options for this
example. Any option flags not contained in this dictionary are
left at their default value (as specified by the
<tt class=
"class">DocTestRunner
</tt>'s
<tt class=
"member">optionflags
</tt>).
By default, no options are set.
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<span class=
"release-info">Release
2.4.2, documentation updated on
28 September
2005.
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