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The SPL version is definitely the way to go. Not only is it the easiest to read, but it's a part of PHP now, so will be familiar to many more people.

There's nothing "wrong" with the others, but as you stated, having all these different versions in one project isn't helping anyone.

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Python 2.6+

next(iter(your_list), None)"

If your_list can be None:

next(iter(your_list or []), None)"

Python 2.4

def get_first(iterable, default=None):"    if iterable:"        for item in iterable:"            return item"    return default"

Example:

x = get_first(get_first_list())"if x:"    ..."y = get_first(get_second_list())"if y:"    ..."

Another option is to inline the above function:

for x in get_first_list() or []:"    # process x"    break # process at most one item"for y in get_second_list() or []:"    # process y"    break"

To avoid break you could write:

for x in yield_first(get_first_list()):"    x # process x"for y in yield_first(get_second_list()):"    y # process y"

Where:

def yield_first(iterable):"    for item in iterable or []:"        yield item"        return"

You can create it using nested lists:

matrix = [[a,b],[c,d],[e,f]]

If it has to be dynamic it's more complicated, why not write a small class yourself?

class Matrix(object):"    def __init__(self, rows, columns, default=0):"        self.m = []"        for i in range(rows):"            self.m.append([default for j in range(columns)])""    def __getitem__(self, index):"        return self.m[index]

This can be used like this:

m = Matrix(10,5)"m[3][6] = 7"print m[3][6] // -> 7

I'm sure one could implement it much more efficient. :)

If you need multidimensional arrays you can either create an array and calculate the offset or you'd use arrays in arrays in arrays, which can be pretty bad for memory. (Could be faster though…) I've implemented the first idea like this:

class Matrix(object):"    def __init__(self, *dims):"        self._shortcuts = [i for i in self._create_shortcuts(dims)]"        self._li = [None] * (self._shortcuts.pop())"        self._shortcuts.reverse()""    def _create_shortcuts(self, dims):"        dimList = list(dims)"        dimList.reverse()"        number = 1"        yield 1"        for i in dimList:"            number *= i"            yield number""    def _flat_index(self, index):"        if len(index) != len(self._shortcuts):"            raise TypeError()""        flatIndex = 0"        for i, num in enumerate(index):"            flatIndex += num * self._shortcuts[i]"        return flatIndex""    def __getitem__(self, index):"        return self._li[self._flat_index(index)]""    def __setitem__(self, index, value):"        self._li[self._flat_index(index)] = value

Can be used like this:

m = Matrix(4,5,2,6)"m[2,3,1,3] = 'x'"m[2,3,1,3] // -> 'x'

There is a number of ways to do it, PyQt4 provides enough information about method names for any object inspecting IDE:

>>> from PyQt4 import QtGui">>> dir(QtGui.QToolBox) "['Box', ... contextMenuPolicy', 'count', 'create', 'currentChanged'...]

All those functions are built-in. This means that you have to push some IDEs slightly to notice them. Be aware that there are no docstrings in compiled PyQt and methods have a funny signature.

Other possibility is using QScintilla2 and.api file generated during PyQt4 build process. Eric4 IDE is prepared exactly for that.

Komodo IDE/Komodo Edit and a CIX file (download here) that I hacked together not so long ago:

and,

Edit: Installation instructions for Komodo 5:

1. Edit -> Preferences -> Code Intelligence
2. Add an API Catalog...
3. Select CIX file, press Open
4. There is no point 4.

1 answer"Bill Paid DateWhat does it even mean? The Bill Paid Date is the date your funds are sent to the biller or payee. What is BPF ? There may be more than one .

We can't guess what you are trying to do, nor what's in your code, not what "setting many different codecs" means, nor what u"string" is supposed to do for you.

Please change your code to its initial state so that it reflects as best you can what you are trying to do, run it again, and then edit your question to provide (1) the full traceback and error message that you get (2) snippet encompassing the last statement in your script that appears in the traceback (3) a brief description of what you want the code to do (4) what version of Python you are running.

Edit after details added to question:

(0) Let's try some transformations on the failing statement:

Original:
code>print "Error reading file %s"%u"%s/%s"%(folder, f)
code>print "Error reading file %s" % u"%s/%s" % (folder, f)
code>print ("Error reading file %s" % u"%s/%s") % (folder, f)
code>print u"Error reading file %s/%s" % (folder, f)

Is that really what you intended? Suggestion: construct the path ONCE, using a better method (see point (2) below).

(1) In general, use repr(foo) or for diagnostics. That way, your diagnostic code is much less likely to cause an exception (as is happening here) AND you avoid ambiguity. Insert the statement print repr(folder), repr(f) before you try to get the size, rerun, and report back.

(2) Don't make paths by u"%s/%s" % (folder, filename) ... use os.path.join(folder, filename)

(3) Don't have bare excepts, check for known problems. So that unknown problems don't remain unknown, do something like this:

try:"    some_code()"except ReasonForBaleOutError:"    continue"except: "    # something's gone wrong, so get diagnostic info"    print repr(interesting_datum_1), repr(interesting_datum_2)"    # ... and get traceback and error message"    raise

A more sophisticated way would involve logging instead of printing, but the above is much better than not knowing what's going on.

Further edits after rtm("os.walk"), remembering old legends, and re-reading your code:

(4) os.walk() walks over the whole tree; you don't need to call it recursively.

(5) If you pass a unicode string to os.walk(), the results (paths, filenames) are reported as unicode. You don't need all that u"blah" stuff. Then you just have to choose how you display the unicode results.

(6) Removing paths with "$" in them: You must modify the list in situ but your method is dangerous. Try something like this:

for i in xrange(len(folders), -1, -1):"    if '$' in folders[i]:"        del folders[i]

(7) Your refer to files by joining a folder name and a file name. You are using the ORIGINAL folder name; when you rip out the recursion, this won't work; you'll need to use the currently-discarded content[0] value reported by os.walk.

(8) You should find yourself using something very simple like:

for folder, subfolders, filenames in os.walk(unicoded_top_folder):

There's no need for generator = os.walk(...); try: content = generator.next() etc and BTW if you ever need to do generator.next() in the future, use except StopIteration instead of a bare except.

(9) If the caller provides a non-existent folder, no exception is raised, it just does nothing. If the provided folder is exists but is empty, ditto. If you need to distinguish between these two scenarios, you'll need to do extra testing yourself.

Response to this comment from the OP: """Thanks, please read the info repr() has shown in the first post. I don't know why it printed so many different items, but it looks like they all have problems. And the common thing between all of them is they are .ink files. May that be the problem? Also, in the last ones, the firefox ones, it prints ( Modalitrovvisoria) while the real file name from Explorer contains ( Modalità provvisoria)""/p>

(10) Umm that's not ".INK".lower(), it's ".LNK".lower() ... perhaps you need to change the font in whatever you're reading that with.

(11) The fact that the "problem" file names all end in ".lnk" /may/ be something to do with os.walk() and/or Windows doing something special with the names of those files.

(12) I repeat here the Python statement that you used to produce that output, with some whitespace introduced :

print repr("    "Error reading file %s" "    % u"%s/%s" % ("        folder.decode('utf-8','ignore'),"        f.decode('utf-8','ignore')"        )"    )

It seems that you have not read, or not understood, or just ignored, the advice I gave you in a comment on another answer (and that answerer's reply): UTF-8 is NOT relevant in the context of file names in a Windows file system.

We are interested in exactly what folder and f refer to. You have trampled all over the evidence by attempting to decode it using UTF-8. You have compounded the obfuscation by using the "ignore" option. Had you used the "replace" option, you would have seen "( Modalitufffdrovvisoria)". The "ignore" option has no place in debugging.

In any case, the fact that some of the file names had some kind of error but appeared NOT to lose characters with the "ignore" option (or appeared NOT to be mangled) is suspicious.

Which part of """Insert the statement print repr(folder), repr(f) """ did you not understand? All that you need to do is something like this:

print "Some meaningful text" # "error reading file" isn't"print "folder:", repr(folder)"print "f:", repr(f)

(13) It also appears that you have introduced UTF-8 elsewhere in your code, judging by the traceback: self.exploreRec(("%s/%s"%(folder, f)).encode("utf-8"), treshold)

I would like to point out that you still do not know whether folder and f refer to str objects or unicode objects, and two answers have suggested that they are very likely to be str objects, so why introduce blahbah.encode() ??

A more general point: Try to understand what your problem(s) is/are, BEFORE changing your script. Thrashing about trying every suggestion coupled with near-zero effective debugging technique is not the way forward.

(14) When you run your script again, you might like to reduce the volume of the output by running it over some subset of C: ... especially if you proceed with my original suggestion to have debug printing of ALL file names, not just the erroneous ones (knowing what non-error ones look like could help in understanding the problem).

Response to Bryan McLemore's "clean up" function:

(15) Here is an annotated interactive session that illustrates what actually happens with os.walk() and non-ASCII file names:

C:junk	erabytest>dir"[snip]" Directory of C:junk	erabytest""20/11/2009  01:28 PM              ."20/11/2009  01:28 PM              .."20/11/2009  11:48 AM              empty"20/11/2009  01:26 PM                11 Hašek.txt"20/11/2009  01:31 PM             1,419 tbyte1.py"29/12/2007  09:33 AM                 9 Ð.txt"               3 File(s)          1,439 bytes"[snip]""C:junk	erabytest>python26python"Python 2.6.4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v.1500 32 bit (Intel)] onwin32"Type "help", "copyright", "credits" or "license" for more information.">>> from pprint import pprint as pp">>> import os

os.walk(unicode_string) -> results in unicode objects

>>> pp(list(os.walk(ur"c:junk	erabytest")))"[(u'c:junk	erabytest',"  [u'empty'],"  [u'Hau0161ek.txt', u'tbyte1.py', u'xd0.txt'])," (u'c:junk	erabytestempty', [], [])]

os.walk(str_string) -> results in str objects

>>> pp(list(os.walk(r"c:junk	erabytest")))"[('c:junk	erabytest',"  ['empty'],"  ['Hax9aek.txt', 'tbyte1.py', 'xd0.txt'])," ('c:junk	erabytestempty', [], [])]

cp1252 is the encoding I'd expect to be used on my system ...

>>> u'u0161'.encode('cp1252')"'x9a'">>> 'Hax9aek'.decode('cp1252')"u'Hau0161ek'

decoding the str with UTF-8 doesn't work, as expected

>>> 'Hax9aek'.decode('utf8')"Traceback (most recent call last):"  File stdin, line 1, in 

ANY random string of bytes can be decoded without error using latin1

>>> 'Hax9aek'.decode('latin1')"u'Hax9aek'

BUT U+009A is a control character (SINGLE CHARACTER INTRODUCER), i.e. meaningless gibberish; absolutely nothing to do with the correct answer

>>> unicodedata.name(u'u0161')"'LATIN SMALL LETTER S WITH CARON'">>>

(16) That example shows what happens when the character is representable in the default character set; what happens if it's not? Here's an example (using IDLE this time) of a file name containing CJK ideographs, which definitely aren't representable in my default character set:

IDLE 2.6.4      ">>> import os">>> from pprint import pprint as pp

repr(Unicode results) looks fine

>>> pp(list(os.walk(ur"c:junk	erabytestchinese")))"[(u'c:junk	erabytestchinese', [], [u'nihaou4f60u597d.txt'])]

and the unicode displays just fine in IDLE:

>>> print list(os.walk(ur"c:junk	erabytestchinese"))[0][2][0]"nihao你好.txt

The str result is evidently produced by using .encode(whatever, "replace") -- not very useful e.g. you can't open the file by passing that as the file name.

>>> pp(list(os.walk(r"c:junk	erabytestchinese")))"[('c:junk	erabytestchinese', [], ['nihao??.txt'])]

So the conclusion is that for best results, one should pass a unicode string to os.walk(), and deal with any display problems.

Django provides an utility function to remove HTML tags:

from django.utils.html import strip_tags""my_string = '
Hello, world
'"my_string = strip_tags(my_string)"print(my_string)"# Result will be "Hello, world" without the 
 elements

This function used to be unsafe on older Django version (before 1.7) but nowadays it is completely safe to use it. Here is an article that reviewed this issue when it was relevant.

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