python-docs-fr/faq/library.po

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#: ../Doc/faq/library.rst:5
msgid "Library and Extension FAQ"
msgstr ""

#: ../Doc/faq/library.rst:12
msgid "General Library Questions"
msgstr ""

#: ../Doc/faq/library.rst:15
msgid "How do I find a module or application to perform task X?"
msgstr ""

#: ../Doc/faq/library.rst:17
msgid ""
"Check :ref:`the Library Reference <library-index>` to see if there's a "
"relevant standard library module.  (Eventually you'll learn what's in the "
"standard library and will be able to skip this step.)"
msgstr ""

#: ../Doc/faq/library.rst:21
msgid ""
"For third-party packages, search the `Python Package Index <https://pypi."
"python.org/pypi>`_ or try `Google <https://www.google.com>`_ or another Web "
"search engine.  Searching for \"Python\" plus a keyword or two for your "
"topic of interest will usually find something helpful."
msgstr ""

#: ../Doc/faq/library.rst:28
msgid "Where is the math.py (socket.py, regex.py, etc.) source file?"
msgstr ""

#: ../Doc/faq/library.rst:30
msgid ""
"If you can't find a source file for a module it may be a built-in or "
"dynamically loaded module implemented in C, C++ or other compiled language. "
"In this case you may not have the source file or it may be something like :"
"file:`mathmodule.c`, somewhere in a C source directory (not on the Python "
"Path)."
msgstr ""

#: ../Doc/faq/library.rst:35
msgid "There are (at least) three kinds of modules in Python:"
msgstr ""

#: ../Doc/faq/library.rst:37
msgid "modules written in Python (.py);"
msgstr ""

#: ../Doc/faq/library.rst:38
msgid ""
"modules written in C and dynamically loaded (.dll, .pyd, .so, .sl, etc);"
msgstr ""

#: ../Doc/faq/library.rst:39
msgid ""
"modules written in C and linked with the interpreter; to get a list of "
"these, type::"
msgstr ""

#: ../Doc/faq/library.rst:47
msgid "How do I make a Python script executable on Unix?"
msgstr ""

#: ../Doc/faq/library.rst:49
msgid ""
"You need to do two things: the script file's mode must be executable and the "
"first line must begin with ``#!`` followed by the path of the Python "
"interpreter."
msgstr ""

#: ../Doc/faq/library.rst:53
msgid ""
"The first is done by executing ``chmod +x scriptfile`` or perhaps ``chmod "
"755 scriptfile``."
msgstr ""

#: ../Doc/faq/library.rst:56
msgid ""
"The second can be done in a number of ways.  The most straightforward way is "
"to write ::"
msgstr ""

#: ../Doc/faq/library.rst:61
msgid ""
"as the very first line of your file, using the pathname for where the Python "
"interpreter is installed on your platform."
msgstr ""

#: ../Doc/faq/library.rst:64
msgid ""
"If you would like the script to be independent of where the Python "
"interpreter lives, you can use the :program:`env` program.  Almost all Unix "
"variants support the following, assuming the Python interpreter is in a "
"directory on the user's :envvar:`PATH`::"
msgstr ""

#: ../Doc/faq/library.rst:71
msgid ""
"*Don't* do this for CGI scripts.  The :envvar:`PATH` variable for CGI "
"scripts is often very minimal, so you need to use the actual absolute "
"pathname of the interpreter."
msgstr ""

#: ../Doc/faq/library.rst:75
msgid ""
"Occasionally, a user's environment is so full that the :program:`/usr/bin/"
"env` program fails; or there's no env program at all.  In that case, you can "
"try the following hack (due to Alex Rezinsky)::"
msgstr ""

#: ../Doc/faq/library.rst:84
msgid ""
"The minor disadvantage is that this defines the script's __doc__ string. "
"However, you can fix that by adding ::"
msgstr ""

#: ../Doc/faq/library.rst:92
msgid "Is there a curses/termcap package for Python?"
msgstr ""

#: ../Doc/faq/library.rst:96
msgid ""
"For Unix variants the standard Python source distribution comes with a "
"curses module in the :source:`Modules` subdirectory, though it's not "
"compiled by default. (Note that this is not available in the Windows "
"distribution -- there is no curses module for Windows.)"
msgstr ""

#: ../Doc/faq/library.rst:101
msgid ""
"The :mod:`curses` module supports basic curses features as well as many "
"additional functions from ncurses and SYSV curses such as colour, "
"alternative character set support, pads, and mouse support. This means the "
"module isn't compatible with operating systems that only have BSD curses, "
"but there don't seem to be any currently maintained OSes that fall into this "
"category."
msgstr ""

#: ../Doc/faq/library.rst:107
msgid ""
"For Windows: use `the consolelib module <http://effbot.org/zone/console-"
"index.htm>`_."
msgstr ""

#: ../Doc/faq/library.rst:112
msgid "Is there an equivalent to C's onexit() in Python?"
msgstr ""

#: ../Doc/faq/library.rst:114
msgid ""
"The :mod:`atexit` module provides a register function that is similar to "
"C's :c:func:`onexit`."
msgstr ""

#: ../Doc/faq/library.rst:119
msgid "Why don't my signal handlers work?"
msgstr ""

#: ../Doc/faq/library.rst:121
msgid ""
"The most common problem is that the signal handler is declared with the "
"wrong argument list.  It is called as ::"
msgstr ""

#: ../Doc/faq/library.rst:126
msgid "so it should be declared with two arguments::"
msgstr ""

#: ../Doc/faq/library.rst:133
msgid "Common tasks"
msgstr ""

#: ../Doc/faq/library.rst:136
msgid "How do I test a Python program or component?"
msgstr ""

#: ../Doc/faq/library.rst:138
msgid ""
"Python comes with two testing frameworks.  The :mod:`doctest` module finds "
"examples in the docstrings for a module and runs them, comparing the output "
"with the expected output given in the docstring."
msgstr ""

#: ../Doc/faq/library.rst:142
msgid ""
"The :mod:`unittest` module is a fancier testing framework modelled on Java "
"and Smalltalk testing frameworks."
msgstr ""

#: ../Doc/faq/library.rst:145
msgid ""
"To make testing easier, you should use good modular design in your program. "
"Your program should have almost all functionality encapsulated in either "
"functions or class methods -- and this sometimes has the surprising and "
"delightful effect of making the program run faster (because local variable "
"accesses are faster than global accesses).  Furthermore the program should "
"avoid depending on mutating global variables, since this makes testing much "
"more difficult to do."
msgstr ""

#: ../Doc/faq/library.rst:153
msgid "The \"global main logic\" of your program may be as simple as ::"
msgstr ""

#: ../Doc/faq/library.rst:158
msgid "at the bottom of the main module of your program."
msgstr ""

#: ../Doc/faq/library.rst:160
msgid ""
"Once your program is organized as a tractable collection of functions and "
"class behaviours you should write test functions that exercise the "
"behaviours.  A test suite that automates a sequence of tests can be "
"associated with each module. This sounds like a lot of work, but since "
"Python is so terse and flexible it's surprisingly easy.  You can make coding "
"much more pleasant and fun by writing your test functions in parallel with "
"the \"production code\", since this makes it easy to find bugs and even "
"design flaws earlier."
msgstr ""

#: ../Doc/faq/library.rst:168
msgid ""
"\"Support modules\" that are not intended to be the main module of a program "
"may include a self-test of the module. ::"
msgstr ""

#: ../Doc/faq/library.rst:174
msgid ""
"Even programs that interact with complex external interfaces may be tested "
"when the external interfaces are unavailable by using \"fake\" interfaces "
"implemented in Python."
msgstr ""

#: ../Doc/faq/library.rst:180
msgid "How do I create documentation from doc strings?"
msgstr ""

#: ../Doc/faq/library.rst:182
msgid ""
"The :mod:`pydoc` module can create HTML from the doc strings in your Python "
"source code.  An alternative for creating API documentation purely from "
"docstrings is `epydoc <http://epydoc.sourceforge.net/>`_.  `Sphinx <http://"
"sphinx-doc.org>`_ can also include docstring content."
msgstr ""

#: ../Doc/faq/library.rst:189
msgid "How do I get a single keypress at a time?"
msgstr ""

#: ../Doc/faq/library.rst:191
msgid ""
"For Unix variants there are several solutions.  It's straightforward to do "
"this using curses, but curses is a fairly large module to learn.  Here's a "
"solution without curses::"
msgstr ""

#: ../Doc/faq/library.rst:216
msgid ""
"You need the :mod:`termios` and the :mod:`fcntl` module for any of this to "
"work, and I've only tried it on Linux, though it should work elsewhere.  In "
"this code, characters are read and printed one at a time."
msgstr ""

#: ../Doc/faq/library.rst:220
msgid ""
":func:`termios.tcsetattr` turns off stdin's echoing and disables canonical "
"mode. :func:`fcntl.fnctl` is used to obtain stdin's file descriptor flags "
"and modify them for non-blocking mode.  Since reading stdin when it is empty "
"results in an :exc:`IOError`, this error is caught and ignored."
msgstr ""

#: ../Doc/faq/library.rst:227
msgid "Threads"
msgstr ""

#: ../Doc/faq/library.rst:230
msgid "How do I program using threads?"
msgstr ""

#: ../Doc/faq/library.rst:234
msgid ""
"Be sure to use the :mod:`threading` module and not the :mod:`thread` module. "
"The :mod:`threading` module builds convenient abstractions on top of the low-"
"level primitives provided by the :mod:`thread` module."
msgstr ""

#: ../Doc/faq/library.rst:238
msgid ""
"Aahz has a set of slides from his threading tutorial that are helpful; see "
"http://www.pythoncraft.com/OSCON2001/."
msgstr ""

#: ../Doc/faq/library.rst:243
msgid "None of my threads seem to run: why?"
msgstr ""

#: ../Doc/faq/library.rst:245
msgid ""
"As soon as the main thread exits, all threads are killed.  Your main thread "
"is running too quickly, giving the threads no time to do any work."
msgstr ""

#: ../Doc/faq/library.rst:248
msgid ""
"A simple fix is to add a sleep to the end of the program that's long enough "
"for all the threads to finish::"
msgstr ""

#: ../Doc/faq/library.rst:262
msgid ""
"But now (on many platforms) the threads don't run in parallel, but appear to "
"run sequentially, one at a time!  The reason is that the OS thread scheduler "
"doesn't start a new thread until the previous thread is blocked."
msgstr ""

#: ../Doc/faq/library.rst:266
msgid "A simple fix is to add a tiny sleep to the start of the run function::"
msgstr ""

#: ../Doc/faq/library.rst:278
msgid ""
"Instead of trying to guess a good delay value for :func:`time.sleep`, it's "
"better to use some kind of semaphore mechanism.  One idea is to use the :mod:"
"`Queue` module to create a queue object, let each thread append a token to "
"the queue when it finishes, and let the main thread read as many tokens from "
"the queue as there are threads."
msgstr ""

#: ../Doc/faq/library.rst:286
msgid "How do I parcel out work among a bunch of worker threads?"
msgstr ""

#: ../Doc/faq/library.rst:288
msgid ""
"Use the :mod:`Queue` module to create a queue containing a list of jobs.  "
"The :class:`~Queue.Queue` class maintains a list of objects and has a ``."
"put(obj)`` method that adds items to the queue and a ``.get()`` method to "
"return them. The class will take care of the locking necessary to ensure "
"that each job is handed out exactly once."
msgstr ""

#: ../Doc/faq/library.rst:294
msgid "Here's a trivial example::"
msgstr ""

#: ../Doc/faq/library.rst:332
msgid "When run, this will produce the following output:"
msgstr ""

#: ../Doc/faq/library.rst:350
msgid ""
"Consult the module's documentation for more details; the :class:`~Queue."
"Queue` class provides a featureful interface."
msgstr ""

#: ../Doc/faq/library.rst:355
msgid "What kinds of global value mutation are thread-safe?"
msgstr ""

#: ../Doc/faq/library.rst:357
msgid ""
"A :term:`global interpreter lock` (GIL) is used internally to ensure that "
"only one thread runs in the Python VM at a time.  In general, Python offers "
"to switch among threads only between bytecode instructions; how frequently "
"it switches can be set via :func:`sys.setcheckinterval`.  Each bytecode "
"instruction and therefore all the C implementation code reached from each "
"instruction is therefore atomic from the point of view of a Python program."
msgstr ""

#: ../Doc/faq/library.rst:364
msgid ""
"In theory, this means an exact accounting requires an exact understanding of "
"the PVM bytecode implementation.  In practice, it means that operations on "
"shared variables of built-in data types (ints, lists, dicts, etc) that "
"\"look atomic\" really are."
msgstr ""

#: ../Doc/faq/library.rst:369
msgid ""
"For example, the following operations are all atomic (L, L1, L2 are lists, "
"D, D1, D2 are dicts, x, y are objects, i, j are ints)::"
msgstr ""

#: ../Doc/faq/library.rst:384
msgid "These aren't::"
msgstr ""

#: ../Doc/faq/library.rst:391
msgid ""
"Operations that replace other objects may invoke those other objects' :meth:"
"`__del__` method when their reference count reaches zero, and that can "
"affect things.  This is especially true for the mass updates to dictionaries "
"and lists.  When in doubt, use a mutex!"
msgstr ""

#: ../Doc/faq/library.rst:398
msgid "Can't we get rid of the Global Interpreter Lock?"
msgstr ""

#: ../Doc/faq/library.rst:403
msgid ""
"The :term:`global interpreter lock` (GIL) is often seen as a hindrance to "
"Python's deployment on high-end multiprocessor server machines, because a "
"multi-threaded Python program effectively only uses one CPU, due to the "
"insistence that (almost) all Python code can only run while the GIL is held."
msgstr ""

#: ../Doc/faq/library.rst:408
msgid ""
"Back in the days of Python 1.5, Greg Stein actually implemented a "
"comprehensive patch set (the \"free threading\" patches) that removed the "
"GIL and replaced it with fine-grained locking.  Unfortunately, even on "
"Windows (where locks are very efficient) this ran ordinary Python code about "
"twice as slow as the interpreter using the GIL.  On Linux the performance "
"loss was even worse because pthread locks aren't as efficient."
msgstr ""

#: ../Doc/faq/library.rst:415
msgid ""
"Since then, the idea of getting rid of the GIL has occasionally come up but "
"nobody has found a way to deal with the expected slowdown, and users who "
"don't use threads would not be happy if their code ran at half the speed.  "
"Greg's free threading patch set has not been kept up-to-date for later "
"Python versions."
msgstr ""

#: ../Doc/faq/library.rst:420
msgid ""
"This doesn't mean that you can't make good use of Python on multi-CPU "
"machines! You just have to be creative with dividing the work up between "
"multiple *processes* rather than multiple *threads*.  Judicious use of C "
"extensions will also help; if you use a C extension to perform a time-"
"consuming task, the extension can release the GIL while the thread of "
"execution is in the C code and allow other threads to get some work done."
msgstr ""

#: ../Doc/faq/library.rst:427
msgid ""
"It has been suggested that the GIL should be a per-interpreter-state lock "
"rather than truly global; interpreters then wouldn't be able to share "
"objects. Unfortunately, this isn't likely to happen either.  It would be a "
"tremendous amount of work, because many object implementations currently "
"have global state. For example, small integers and short strings are cached; "
"these caches would have to be moved to the interpreter state.  Other object "
"types have their own free list; these free lists would have to be moved to "
"the interpreter state. And so on."
msgstr ""

#: ../Doc/faq/library.rst:436
msgid ""
"And I doubt that it can even be done in finite time, because the same "
"problem exists for 3rd party extensions.  It is likely that 3rd party "
"extensions are being written at a faster rate than you can convert them to "
"store all their global state in the interpreter state."
msgstr ""

#: ../Doc/faq/library.rst:441
msgid ""
"And finally, once you have multiple interpreters not sharing any state, what "
"have you gained over running each interpreter in a separate process?"
msgstr ""

#: ../Doc/faq/library.rst:446
msgid "Input and Output"
msgstr "Les entrées/sorties"

#: ../Doc/faq/library.rst:449
msgid "How do I delete a file? (And other file questions...)"
msgstr ""

#: ../Doc/faq/library.rst:451
msgid ""
"Use ``os.remove(filename)`` or ``os.unlink(filename)``; for documentation, "
"see the :mod:`os` module.  The two functions are identical; :func:`unlink` "
"is simply the name of the Unix system call for this function."
msgstr ""

#: ../Doc/faq/library.rst:455
msgid ""
"To remove a directory, use :func:`os.rmdir`; use :func:`os.mkdir` to create "
"one. ``os.makedirs(path)`` will create any intermediate directories in "
"``path`` that don't exist. ``os.removedirs(path)`` will remove intermediate "
"directories as long as they're empty; if you want to delete an entire "
"directory tree and its contents, use :func:`shutil.rmtree`."
msgstr ""

#: ../Doc/faq/library.rst:461
msgid "To rename a file, use ``os.rename(old_path, new_path)``."
msgstr ""

#: ../Doc/faq/library.rst:463
msgid ""
"To truncate a file, open it using ``f = open(filename, \"r+\")``, and use "
"``f.truncate(offset)``; offset defaults to the current seek position.  "
"There's also ``os.ftruncate(fd, offset)`` for files opened with :func:`os."
"open`, where *fd* is the file descriptor (a small integer)."
msgstr ""

#: ../Doc/faq/library.rst:468
msgid ""
"The :mod:`shutil` module also contains a number of functions to work on "
"files including :func:`~shutil.copyfile`, :func:`~shutil.copytree`, and :"
"func:`~shutil.rmtree`."
msgstr ""

#: ../Doc/faq/library.rst:474
msgid "How do I copy a file?"
msgstr ""

#: ../Doc/faq/library.rst:476
msgid ""
"The :mod:`shutil` module contains a :func:`~shutil.copyfile` function.  Note "
"that on MacOS 9 it doesn't copy the resource fork and Finder info."
msgstr ""

#: ../Doc/faq/library.rst:481
msgid "How do I read (or write) binary data?"
msgstr ""

#: ../Doc/faq/library.rst:483
msgid ""
"To read or write complex binary data formats, it's best to use the :mod:"
"`struct` module.  It allows you to take a string containing binary data "
"(usually numbers) and convert it to Python objects; and vice versa."
msgstr ""

#: ../Doc/faq/library.rst:487
msgid ""
"For example, the following code reads two 2-byte integers and one 4-byte "
"integer in big-endian format from a file::"
msgstr ""

#: ../Doc/faq/library.rst:496
msgid ""
"The '>' in the format string forces big-endian data; the letter 'h' reads "
"one \"short integer\" (2 bytes), and 'l' reads one \"long integer\" (4 "
"bytes) from the string."
msgstr ""

#: ../Doc/faq/library.rst:500
msgid ""
"For data that is more regular (e.g. a homogeneous list of ints or floats), "
"you can also use the :mod:`array` module."
msgstr ""

#: ../Doc/faq/library.rst:505
msgid "I can't seem to use os.read() on a pipe created with os.popen(); why?"
msgstr ""

#: ../Doc/faq/library.rst:507
msgid ""
":func:`os.read` is a low-level function which takes a file descriptor, a "
"small integer representing the opened file.  :func:`os.popen` creates a high-"
"level file object, the same type returned by the built-in :func:`open` "
"function. Thus, to read *n* bytes from a pipe *p* created with :func:`os."
"popen`, you need to use ``p.read(n)``."
msgstr ""

#: ../Doc/faq/library.rst:515
msgid ""
"How do I run a subprocess with pipes connected to both input and output?"
msgstr ""

#: ../Doc/faq/library.rst:519
msgid "Use the :mod:`popen2` module.  For example::"
msgstr ""

#: ../Doc/faq/library.rst:527
msgid ""
"Warning: in general it is unwise to do this because you can easily cause a "
"deadlock where your process is blocked waiting for output from the child "
"while the child is blocked waiting for input from you.  This can be caused "
"by the parent expecting the child to output more text than it does or by "
"data being stuck in stdio buffers due to lack of flushing.  The Python "
"parent can of course explicitly flush the data it sends to the child before "
"it reads any output, but if the child is a naive C program it may have been "
"written to never explicitly flush its output, even if it is interactive, "
"since flushing is normally automatic."
msgstr ""

#: ../Doc/faq/library.rst:537
msgid ""
"Note that a deadlock is also possible if you use :func:`popen3` to read "
"stdout and stderr. If one of the two is too large for the internal buffer "
"(increasing the buffer size does not help) and you ``read()`` the other one "
"first, there is a deadlock, too."
msgstr ""

#: ../Doc/faq/library.rst:542
msgid ""
"Note on a bug in popen2: unless your program calls ``wait()`` or "
"``waitpid()``, finished child processes are never removed, and eventually "
"calls to popen2 will fail because of a limit on the number of child "
"processes.  Calling :func:`os.waitpid` with the :data:`os.WNOHANG` option "
"can prevent this; a good place to insert such a call would be before calling "
"``popen2`` again."
msgstr ""

#: ../Doc/faq/library.rst:548
msgid ""
"In many cases, all you really need is to run some data through a command and "
"get the result back.  Unless the amount of data is very large, the easiest "
"way to do this is to write it to a temporary file and run the command with "
"that temporary file as input.  The standard module :mod:`tempfile` exports "
"a :func:`~tempfile.mktemp` function to generate unique temporary file "
"names. ::"
msgstr ""

#: ../Doc/faq/library.rst:583
msgid ""
"Note that many interactive programs (e.g. vi) don't work well with pipes "
"substituted for standard input and output.  You will have to use pseudo ttys "
"(\"ptys\") instead of pipes. Or you can use a Python interface to Don Libes' "
"\"expect\" library.  A Python extension that interfaces to expect is called "
"\"expy\" and available from http://expectpy.sourceforge.net.  A pure Python "
"solution that works like expect is `pexpect <https://pypi.python.org/pypi/"
"pexpect/>`_."
msgstr ""

#: ../Doc/faq/library.rst:592
msgid "How do I access the serial (RS232) port?"
msgstr ""

#: ../Doc/faq/library.rst:594
msgid "For Win32, POSIX (Linux, BSD, etc.), Jython:"
msgstr ""

#: ../Doc/faq/library.rst:596
msgid "http://pyserial.sourceforge.net"
msgstr ""

#: ../Doc/faq/library.rst:598
msgid "For Unix, see a Usenet post by Mitch Chapman:"
msgstr ""

#: ../Doc/faq/library.rst:600
msgid "https://groups.google.com/groups?selm=34A04430.CF9@ohioee.com"
msgstr ""

#: ../Doc/faq/library.rst:604
msgid "Why doesn't closing sys.stdout (stdin, stderr) really close it?"
msgstr ""

#: ../Doc/faq/library.rst:606
msgid ""
"Python file objects are a high-level layer of abstraction on top of C "
"streams, which in turn are a medium-level layer of abstraction on top of "
"(among other things) low-level C file descriptors."
msgstr ""

#: ../Doc/faq/library.rst:610
msgid ""
"For most file objects you create in Python via the built-in ``file`` "
"constructor, ``f.close()`` marks the Python file object as being closed from "
"Python's point of view, and also arranges to close the underlying C stream. "
"This also happens automatically in ``f``'s destructor, when ``f`` becomes "
"garbage."
msgstr ""

#: ../Doc/faq/library.rst:616
msgid ""
"But stdin, stdout and stderr are treated specially by Python, because of the "
"special status also given to them by C.  Running ``sys.stdout.close()`` "
"marks the Python-level file object as being closed, but does *not* close the "
"associated C stream."
msgstr ""

#: ../Doc/faq/library.rst:621
msgid ""
"To close the underlying C stream for one of these three, you should first be "
"sure that's what you really want to do (e.g., you may confuse extension "
"modules trying to do I/O).  If it is, use os.close::"
msgstr ""

#: ../Doc/faq/library.rst:631
msgid "Network/Internet Programming"
msgstr ""

#: ../Doc/faq/library.rst:634
msgid "What WWW tools are there for Python?"
msgstr ""

#: ../Doc/faq/library.rst:636
msgid ""
"See the chapters titled :ref:`internet` and :ref:`netdata` in the Library "
"Reference Manual.  Python has many modules that will help you build server-"
"side and client-side web systems."
msgstr ""

#: ../Doc/faq/library.rst:642
msgid ""
"A summary of available frameworks is maintained by Paul Boddie at https://"
"wiki.python.org/moin/WebProgramming\\ ."
msgstr ""

#: ../Doc/faq/library.rst:645
msgid ""
"Cameron Laird maintains a useful set of pages about Python web technologies "
"at http://phaseit.net/claird/comp.lang.python/web_python."
msgstr ""

#: ../Doc/faq/library.rst:650
msgid "How can I mimic CGI form submission (METHOD=POST)?"
msgstr ""

#: ../Doc/faq/library.rst:652
msgid ""
"I would like to retrieve web pages that are the result of POSTing a form. Is "
"there existing code that would let me do this easily?"
msgstr ""

#: ../Doc/faq/library.rst:655
msgid "Yes. Here's a simple example that uses httplib::"
msgstr ""

#: ../Doc/faq/library.rst:679
msgid ""
"Note that in general for percent-encoded POST operations, query strings must "
"be quoted using :func:`urllib.urlencode`.  For example, to send ``name=Guy "
"Steele, Jr.``::"
msgstr ""

#: ../Doc/faq/library.rst:689
msgid "What module should I use to help with generating HTML?"
msgstr ""

#: ../Doc/faq/library.rst:693
msgid ""
"You can find a collection of useful links on the `Web Programming wiki page "
"<https://wiki.python.org/moin/WebProgramming>`_."
msgstr ""

#: ../Doc/faq/library.rst:698
msgid "How do I send mail from a Python script?"
msgstr ""

#: ../Doc/faq/library.rst:700
msgid "Use the standard library module :mod:`smtplib`."
msgstr ""

#: ../Doc/faq/library.rst:702
msgid ""
"Here's a very simple interactive mail sender that uses it.  This method will "
"work on any host that supports an SMTP listener. ::"
msgstr ""

#: ../Doc/faq/library.rst:722
msgid ""
"A Unix-only alternative uses sendmail.  The location of the sendmail program "
"varies between systems; sometimes it is ``/usr/lib/sendmail``, sometimes ``/"
"usr/sbin/sendmail``.  The sendmail manual page will help you out.  Here's "
"some sample code::"
msgstr ""

#: ../Doc/faq/library.rst:742
msgid "How do I avoid blocking in the connect() method of a socket?"
msgstr ""

#: ../Doc/faq/library.rst:744
msgid ""
"The select module is commonly used to help with asynchronous I/O on sockets."
msgstr ""

#: ../Doc/faq/library.rst:746
msgid ""
"To prevent the TCP connect from blocking, you can set the socket to non-"
"blocking mode.  Then when you do the ``connect()``, you will either connect "
"immediately (unlikely) or get an exception that contains the error number as "
"``.errno``. ``errno.EINPROGRESS`` indicates that the connection is in "
"progress, but hasn't finished yet.  Different OSes will return different "
"values, so you're going to have to check what's returned on your system."
msgstr ""

#: ../Doc/faq/library.rst:753
msgid ""
"You can use the ``connect_ex()`` method to avoid creating an exception.  It "
"will just return the errno value.  To poll, you can call ``connect_ex()`` "
"again later -- 0 or ``errno.EISCONN`` indicate that you're connected -- or "
"you can pass this socket to select to check if it's writable."
msgstr ""

#: ../Doc/faq/library.rst:760
msgid "Databases"
msgstr ""

#: ../Doc/faq/library.rst:763
msgid "Are there any interfaces to database packages in Python?"
msgstr ""

#: ../Doc/faq/library.rst:765
msgid "Yes."
msgstr ""

#: ../Doc/faq/library.rst:769
msgid ""
"Python 2.3 includes the :mod:`bsddb` package which provides an interface to "
"the BerkeleyDB library.  Interfaces to disk-based hashes such as :mod:`DBM "
"<dbm>` and :mod:`GDBM <gdbm>` are also included with standard Python."
msgstr ""

#: ../Doc/faq/library.rst:773
msgid ""
"Support for most relational databases is available.  See the "
"`DatabaseProgramming wiki page <https://wiki.python.org/moin/"
"DatabaseProgramming>`_ for details."
msgstr ""

#: ../Doc/faq/library.rst:779
msgid "How do you implement persistent objects in Python?"
msgstr ""

#: ../Doc/faq/library.rst:781
msgid ""
"The :mod:`pickle` library module solves this in a very general way (though "
"you still can't store things like open files, sockets or windows), and the :"
"mod:`shelve` library module uses pickle and (g)dbm to create persistent "
"mappings containing arbitrary Python objects.  For better performance, you "
"can use the :mod:`cPickle` module."
msgstr ""

#: ../Doc/faq/library.rst:787
msgid ""
"A more awkward way of doing things is to use pickle's little sister, "
"marshal. The :mod:`marshal` module provides very fast ways to store "
"noncircular basic Python types to files and strings, and back again.  "
"Although marshal does not do fancy things like store instances or handle "
"shared references properly, it does run extremely fast.  For example, "
"loading a half megabyte of data may take less than a third of a second.  "
"This often beats doing something more complex and general such as using gdbm "
"with pickle/shelve."
msgstr ""

#: ../Doc/faq/library.rst:797
msgid "Why is cPickle so slow?"
msgstr ""

#: ../Doc/faq/library.rst:801
msgid ""
"By default :mod:`pickle` uses a relatively old and slow format for backward "
"compatibility.  You can however specify other protocol versions that are "
"faster::"
msgstr ""

#: ../Doc/faq/library.rst:810
msgid ""
"If my program crashes with a bsddb (or anydbm) database open, it gets "
"corrupted. How come?"
msgstr ""

#: ../Doc/faq/library.rst:812
msgid ""
"Databases opened for write access with the bsddb module (and often by the "
"anydbm module, since it will preferentially use bsddb) must explicitly be "
"closed using the ``.close()`` method of the database.  The underlying "
"library caches database contents which need to be converted to on-disk form "
"and written."
msgstr ""

#: ../Doc/faq/library.rst:817
msgid ""
"If you have initialized a new bsddb database but not written anything to it "
"before the program crashes, you will often wind up with a zero-length file "
"and encounter an exception the next time the file is opened."
msgstr ""

#: ../Doc/faq/library.rst:823
msgid ""
"I tried to open Berkeley DB file, but bsddb produces bsddb.error: (22, "
"'Invalid argument'). Help! How can I restore my data?"
msgstr ""

#: ../Doc/faq/library.rst:825
msgid ""
"Don't panic! Your data is probably intact. The most frequent cause for the "
"error is that you tried to open an earlier Berkeley DB file with a later "
"version of the Berkeley DB library."
msgstr ""

#: ../Doc/faq/library.rst:829
msgid ""
"Many Linux systems now have all three versions of Berkeley DB available.  If "
"you are migrating from version 1 to a newer version use db_dump185 to dump a "
"plain text version of the database.  If you are migrating from version 2 to "
"version 3 use db2_dump to create a plain text version of the database.  In "
"either case, use db_load to create a new native database for the latest "
"version installed on your computer.  If you have version 3 of Berkeley DB "
"installed, you should be able to use db2_load to create a native version 2 "
"database."
msgstr ""

#: ../Doc/faq/library.rst:837
msgid ""
"You should move away from Berkeley DB version 1 files because the hash file "
"code contains known bugs that can corrupt your data."
msgstr ""

#: ../Doc/faq/library.rst:842
msgid "Mathematics and Numerics"
msgstr ""

#: ../Doc/faq/library.rst:845
msgid "How do I generate random numbers in Python?"
msgstr ""

#: ../Doc/faq/library.rst:847
msgid ""
"The standard module :mod:`random` implements a random number generator.  "
"Usage is simple::"
msgstr ""

#: ../Doc/faq/library.rst:853
msgid "This returns a random floating point number in the range [0, 1)."
msgstr ""

#: ../Doc/faq/library.rst:855
msgid ""
"There are also many other specialized generators in this module, such as:"
msgstr ""

#: ../Doc/faq/library.rst:857
msgid "``randrange(a, b)`` chooses an integer in the range [a, b)."
msgstr ""

#: ../Doc/faq/library.rst:858
msgid "``uniform(a, b)`` chooses a floating point number in the range [a, b)."
msgstr ""

#: ../Doc/faq/library.rst:859
msgid ""
"``normalvariate(mean, sdev)`` samples the normal (Gaussian) distribution."
msgstr ""

#: ../Doc/faq/library.rst:861
msgid "Some higher-level functions operate on sequences directly, such as:"
msgstr ""

#: ../Doc/faq/library.rst:863
msgid "``choice(S)`` chooses random element from a given sequence"
msgstr ""

#: ../Doc/faq/library.rst:864
msgid "``shuffle(L)`` shuffles a list in-place, i.e. permutes it randomly"
msgstr ""

#: ../Doc/faq/library.rst:866
msgid ""
"There's also a ``Random`` class you can instantiate to create independent "
"multiple random number generators."
msgstr ""