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<H2><A NAME="SECTION0071520000000000000000"></A><A NAME="set-example"></A>
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5.15.2 Example
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<div class="verbatim"><pre>
&gt;&gt;&gt; from sets import Set
&gt;&gt;&gt; engineers = Set(['John', 'Jane', 'Jack', 'Janice'])
&gt;&gt;&gt; programmers = Set(['Jack', 'Sam', 'Susan', 'Janice'])
&gt;&gt;&gt; managers = Set(['Jane', 'Jack', 'Susan', 'Zack'])
&gt;&gt;&gt; employees = engineers | programmers | managers           # union
&gt;&gt;&gt; engineering_management = engineers &amp; managers            # intersection
&gt;&gt;&gt; fulltime_management = managers - engineers - programmers # difference
&gt;&gt;&gt; engineers.add('Marvin')                                  # add element
&gt;&gt;&gt; print engineers
Set(['Jane', 'Marvin', 'Janice', 'John', 'Jack'])
&gt;&gt;&gt; employees.issuperset(engineers)           # superset test
False
&gt;&gt;&gt; employees.union_update(engineers)         # update from another set
&gt;&gt;&gt; employees.issuperset(engineers)
True
&gt;&gt;&gt; for group in [engineers, programmers, managers, employees]:
...     group.discard('Susan')                # unconditionally remove element
...     print group
...
Set(['Jane', 'Marvin', 'Janice', 'John', 'Jack'])
Set(['Janice', 'Jack', 'Sam'])
Set(['Jane', 'Zack', 'Jack'])
Set(['Jack', 'Sam', 'Jane', 'Marvin', 'Janice', 'John', 'Zack'])
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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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