This section lists previously described changes that may require
changes to your code:
- Left shifts and hexadecimal/octal constants that are too
large no longer trigger a FutureWarning and return
a value limited to 32 or 64 bits; instead they return a long integer.
- Integer operations will no longer trigger an OverflowWarning.
The OverflowWarning warning will disappear in Python 2.5.
- The zip() built-in function and itertools.izip()
now return an empty list instead of raising a TypeError
exception if called with no arguments.
- dircache.listdir() now passes exceptions to the caller
instead of returning empty lists.
- LexicalHandler.startDTD() used to receive the public and
system IDs in the wrong order. This has been corrected; applications
relying on the wrong order need to be fixed.
- fcntl.ioctl now warns if the mutate
argument is omitted and relevant.
- The tarfile module now generates GNU-format tar files
by default.
- Encountering a failure while importing a module no longer leaves
a partially-initialized module object in
sys.modules.
- None is now a constant; code that binds a new value to
the name "None" is now a syntax error.
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