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Add SAXReaderNotAvailable, and use it to distinguish between an

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ImportError, and a missing driver.
This commit is contained in:
Martin v. Löwis 2000-10-06 17:41:52 +00:00
parent 75698a4937
commit 962c9e7f91
5 changed files with 44 additions and 5 deletions
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10
Lib/xml/sax/_exceptions.py
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@ -104,3 +104,13 @@ class SAXNotSupportedException(SAXException):
perform is requested (specifically setting a state or value). SAX
applications and extensions may use this class for similar
purposes."""
# ===== SAXNOTSUPPORTEDEXCEPTION =====
class SAXReaderNotAvailable(SAXNotSupportedException):
"""Exception class for a missing driver.
An XMLReader module (driver) should raise this exception when it
is first imported, e.g. when a support module cannot be imported.
It also may be raised during parsing, e.g. if executing an external
program is not permitted."""