Errata

The Meaning of the -tt option reads:

"Like -tt, but raises an error rather than a warning"
now reads:
"Like -t, but raises an error rather than a warning"

p. 45 --
"from future import division"
now reads:
"from __future__ import division"

"j is less than i"
now reads:
"j is less than or equal to i"

L[i:i]=['a','b'] inserts the items 'a' and 'b' after item i in L.

now reads:

L[i:i]=['a','b'] inserts the items 'a' and 'b' before item i in L.

The code:
class OptimizedRectangle(object):
__slots__ = 'width', 'height'

__slots__ cannot usefully be added by inheritance in this way; so the
example should be rewritten to avoid inheritance and rather just copy
the whole Rectangle class as given at the top of page 85 under the new
name OptimizedRectangle:

class OptimizedRectangle(object):
__slots__ = 'width', 'height'
def __init__(self, width, height):
self.width = width
self.height = height
def getArea(self):
return self.width * self.height
area = property(getArea, doc="area of the rectangle")

The last Paragraph of the description of map states:-

"When func is None, map returns a list of tuples ..."

This is only true if map is given at least 2 seqs to "map".
If it is given a single seq, it returns the seq itself.

This can cause serious errors in programs that expect
tuples to be returned.

Note from the Author or Editor:
p. 164 under `map`, 2nd paragraph, change the text that now reads

When func is None, map returns a list of tuples, each with n items (one item from each iterable); this is

to read

When func is None, map returns a list of tuples, each with n items (one item from each iterable) when n>1; this is

and add to the same paragraph (which now ends "the longer ones.") a further sentence

When func is None and n is 1, map returns a list of the items of seq (while zip would return a list of tuples with just one item each).

The os.path Module functions table is missing the "expanduser" method
and related description. (See, for example, the documentation at the
following URL: http://python.org/doc/2.2.3/lib/module-os.path.html)

"but calling lstat on a file that does not support seeking ..."
should be:
"but calling lseek on a file that does not support seeking ..."

"in releases of Python older than the ones covered in this book,
unpickling from an untrusted data source was a security risk ... No
such weaknesses are known in Python 2.1 and later."

This is no longer true, the 2nd edition says:

Note that unpickling from an untrusted data source is a security risk; an attacker could
exploit this to execute arbitrary code. Don't unpickle untrusted data!

import os
os.spawnv(os.p_WAIT, editor, [textfile])

NOW READS:
import os
os.spawnv(os.p_WAIT, editor, [editor, textfile])

and, the last sentence NOW READS:

The first item of the argument <replaceable>args</replaceable> is
passed to the program being spawned as "the name under which the
program is being invoked". Most programs don't look at this, so you
can place any string there. Just in case the editor program does look
at this special first argument, passing the same string
<replaceable>editor</replaceable> that is used as the second argument
to os.spawnv is the simplest and most effective approach.

where it says:
an array with rank of one less than a and of the same size as a

The text now reads:
an array with rank 1 and of the same size as a

where it says:
just like array(a,copy=False).flat

The text now reads:
just like array(a,copy=(not a.iscontiguous())).flat

An Entry instance with state=DISABLED is a good way...

"state=DISABLED" should be replaced by "state='readonly'" for the
remainder of the page.

state=DISABLED doesn't allow you to select an Entry's text
or copy it to the clipboard.

Note from the Author or Editor:
p. 416 and 417 *NOT* 337, change all occurrences of DISABLED (I count four) to 'readonly' (lowercase and with single quotes around). So for example

state=DISABLED

must become

state='readonly'

and so on.

toggle c.deselect()

Now reads:
toggle c.toggle()

try: x.f()
except AttributeError:
sys.stderr.write('x is type %s, (%r)
'%(x,type(x)))

That 3rd line NOW READS:
sys.stderr.write('x is type %s, (%r)
'%(type(x), x))

omitted nlist method.
The nlst method should probably be included, in its normal alphabetical order
(i.e., after mkd but before pwd) with the text (in the usual mixture of fonts
and typefaces like for the other methods):

nlst f.nlst(pathname='.')
Sends a NLST command to the FTP server, asking for the names
of the files in the directory named by pathname (by default,
the current directory), and returns the list of the filenames.

((i.e., as usual, I would omit weird, rarely used stuff such as, in this case,
the optional, non-portable extra arguments)).

The example trivial HTTP server is missing the two lines to instantiate and start up the server.

After the line do_HEAD = do_POST = do_GET, the following two lines have been added:
server = BaseHTTPServer.HTTPServer(('',80), TrivialHTTPRequestHandler)
server.serve_forever()

quoteattr escape(data,entities={})

Now reads:
quoteattr quoteattr(data,entities={})

Pages 507, 508, and 511:
The following warning note has been added on page 511:

The code examples given on pages 507, 508 and 511 may crash under
some version of Python and Windows (not Python 2.3, and not Linux
versions of Python). To fix your version of Python so that it is able to
run the examples, visit URL:

http://sourceforge.net/project/showfiles.php?group_id=6473

and download and run the appropriate self-installing .EXE, for example
currently PyXML-0.8.2.win32-py2.2.exe if you run Python 2.2 on any
version of Microsoft Windows. This self-installing EXE will add to your
Python installation the latest version of the "XML subsystem" of Python,
and, as a side effect, fix any bugs connected to XML handling that may
have been diagnosed after the release of your version of Python.

sdist default does not include scripts or data files, even if specifically mentioned
in the setup.py script. The default only includes:
"all Python source files implied by the py_modules and packages options"

To include scripts or data files by sdist, you have to create a MANIFEST.in

The Installer website NOW READS:
http://www.mcmillan-inc.com/install1.html

There is no entry in the index for the consept "frozen", mentioned on page 121 just
before and after the heading "Searching the Filesystem for a Module".

Worse IMHO, there's no explanation in the book, that I can find, on what "frozen
modules" is. A line or two on page 121 would have been nice.