Minor clarifications in the introductory paragraph.
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\modulesynopsis{Standard exceptions classes.}
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Exceptions can be class objects or string objects. While
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traditionally most exceptions have been string objects, in Python
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1.5, all standard exceptions have been converted to class objects,
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and users are encouraged to do the same. The exceptions are defined
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in the module \module{exceptions}; this module never needs to be
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imported explicitly.
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Exceptions can be class objects or string objects. Though most
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exceptions have been string objects in past versions of Python, in
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Python 1.5 and newer versions, all standard exceptions have been
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converted to class objects, and users are encouraged to do the same.
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The exceptions are defined in the module \module{exceptions}. This
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module never needs to be imported explicitly: the exceptions are
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provided in the built-in namespace.
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Two distinct string objects with the same value are considered different
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exceptions. This is done to force programmers to use exception names
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