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# SOME DESCRIPTIVE TITLE.

# This file is distributed under the same license as the Python package.

# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.

# Translators:

# ww song <sww4718168@gmail.com>, 2019

# SKY H. <sky19960802@gmail.com>, 2019

# Henry Zhu <zhuhe212@163.com>, 2019

# Pan Felix <tinylambda@gmail.com>, 2019

# Freesand Leo <yuqinju@163.com>, 2020

#, fuzzy

msgid ""

msgstr ""

"Project-Id-Version: Python 3.7\n"

"Report-Msgid-Bugs-To: \n"

"POT-Creation-Date: 2021-01-01 16:02+0000\n"

"PO-Revision-Date: 2019-09-01 02:41+0000\n"

"Last-Translator: Freesand Leo <yuqinju@163.com>, 2020\n"

"Language-Team: Chinese (China) (https://www.transifex.com/python-doc/teams/5390/zh_CN/)\n"

"MIME-Version: 1.0\n"

"Content-Type: text/plain; charset=UTF-8\n"

"Content-Transfer-Encoding: 8bit\n"

"Language: zh_CN\n"

"Plural-Forms: nplurals=1; plural=0;\n"

#: ../../tutorial/stdlib2.rst:5

msgid "Brief Tour of the Standard Library --- Part II"

msgstr " "

#: ../../tutorial/stdlib2.rst:7

msgid ""

"This second tour covers more advanced modules that support professional "

"programming needs. These modules rarely occur in small scripts."

msgstr ""

#: ../../tutorial/stdlib2.rst:14

msgid "Output Formatting"

msgstr ""

#: ../../tutorial/stdlib2.rst:16

msgid ""

"The :mod:`reprlib` module provides a version of :func:`repr` customized for "

"abbreviated displays of large or deeply nested containers::"

msgstr ":mod:`reprlib` :func:`repr` ::"

#: ../../tutorial/stdlib2.rst:23

msgid ""

"The :mod:`pprint` module offers more sophisticated control over printing "

"both built-in and user defined objects in a way that is readable by the "

"interpreter. When the result is longer than one line, the \"pretty printer\""

" adds line breaks and indentation to more clearly reveal data structure::"

msgstr ""

":mod:`pprint` "

"::"

#: ../../tutorial/stdlib2.rst:39

msgid ""

"The :mod:`textwrap` module formats paragraphs of text to fit a given screen "

"width::"

msgstr ":mod:`textwrap` ::"

#: ../../tutorial/stdlib2.rst:53

msgid ""

"The :mod:`locale` module accesses a database of culture specific data "

"formats. The grouping attribute of locale's format function provides a "

"direct way of formatting numbers with group separators::"

msgstr ""

":mod:`locale` locale format grouping "

"::"

#: ../../tutorial/stdlib2.rst:72

msgid "Templating"

msgstr ""

#: ../../tutorial/stdlib2.rst:74

msgid ""

"The :mod:`string` module includes a versatile :class:`~string.Template` "

"class with a simplified syntax suitable for editing by end-users. This "

"allows users to customize their applications without having to alter the "

"application."

msgstr ""

":mod:`string` :class:`~string.Template` "

#: ../../tutorial/stdlib2.rst:78

msgid ""

"The format uses placeholder names formed by ``$`` with valid Python "

"identifiers (alphanumeric characters and underscores). Surrounding the "

"placeholder with braces allows it to be followed by more alphanumeric "

"letters with no intervening spaces. Writing ``$$`` creates a single escaped"

" ``$``::"

msgstr ""

" ``$`` Python "

"``$$`` "

" ``$``::"

#: ../../tutorial/stdlib2.rst:88

msgid ""

"The :meth:`~string.Template.substitute` method raises a :exc:`KeyError` when"

" a placeholder is not supplied in a dictionary or a keyword argument. For "

"mail-merge style applications, user supplied data may be incomplete and the "

":meth:`~string.Template.safe_substitute` method may be more appropriate --- "

"it will leave placeholders unchanged if data is missing::"

msgstr ""

" :meth:`~string.Template.substitute` "

":exc:`KeyError`\\ "

":meth:`~string.Template.safe_substitute` "

#: ../../tutorial/stdlib2.rst:103

msgid ""

"Template subclasses can specify a custom delimiter. For example, a batch "

"renaming utility for a photo browser may elect to use percent signs for "

"placeholders such as the current date, image sequence number, or file "

"format::"

msgstr "Template ::"

#: ../../tutorial/stdlib2.rst:125

msgid ""

"Another application for templating is separating program logic from the "

"details of multiple output formats. This makes it possible to substitute "

"custom templates for XML files, plain text reports, and HTML web reports."

msgstr ""

" XML HTML "

#: ../../tutorial/stdlib2.rst:133

msgid "Working with Binary Data Record Layouts"

msgstr ""

#: ../../tutorial/stdlib2.rst:135

msgid ""

"The :mod:`struct` module provides :func:`~struct.pack` and "

":func:`~struct.unpack` functions for working with variable length binary "

"record formats. The following example shows how to loop through header "

"information in a ZIP file without using the :mod:`zipfile` module. Pack "

"codes ``\"H\"`` and ``\"I\"`` represent two and four byte unsigned numbers "

"respectively. The ``\"<\"`` indicates that they are standard size and in "

"little-endian byte order::"

msgstr ""

":mod:`struct` :func:`~struct.pack` :func:`~struct.unpack` "

" :mod:`zipfile` ZIP "

"Pack ``\"H\"`` ``\"I\"`` \\ ``\"<\"`` "

"::"

#: ../../tutorial/stdlib2.rst:166

msgid "Multi-threading"

msgstr ""

#: ../../tutorial/stdlib2.rst:168

msgid ""

"Threading is a technique for decoupling tasks which are not sequentially "

"dependent. Threads can be used to improve the responsiveness of "

"applications that accept user input while other tasks run in the background."

" A related use case is running I/O in parallel with computations in another"

" thread."

msgstr ""

" "

"I/O "

#: ../../tutorial/stdlib2.rst:173

msgid ""

"The following code shows how the high level :mod:`threading` module can run "

"tasks in background while the main program continues to run::"

msgstr " :mod:`threading` ::"

#: ../../tutorial/stdlib2.rst:197

msgid ""

"The principal challenge of multi-threaded applications is coordinating "

"threads that share data or other resources. To that end, the threading "

"module provides a number of synchronization primitives including locks, "

"events, condition variables, and semaphores."

msgstr ""

"threading "

#: ../../tutorial/stdlib2.rst:202

msgid ""

"While those tools are powerful, minor design errors can result in problems "

"that are difficult to reproduce. So, the preferred approach to task "

"coordination is to concentrate all access to a resource in a single thread "

"and then use the :mod:`queue` module to feed that thread with requests from "

"other threads. Applications using :class:`~queue.Queue` objects for inter-"

"thread communication and coordination are easier to design, more readable, "

"and more reliable."

msgstr ""

" "

":mod:`queue` :class:`~queue.Queue` "

#: ../../tutorial/stdlib2.rst:213

msgid "Logging"

msgstr ""

#: ../../tutorial/stdlib2.rst:215

msgid ""

"The :mod:`logging` module offers a full featured and flexible logging "

"system. At its simplest, log messages are sent to a file or to "

"``sys.stderr``::"

msgstr ""

":mod:`logging` ``sys.stderr``\\ ::"

#: ../../tutorial/stdlib2.rst:225

msgid "This produces the following output:"

msgstr ":"

#: ../../tutorial/stdlib2.rst:233

msgid ""

"By default, informational and debugging messages are suppressed and the "

"output is sent to standard error. Other output options include routing "

"messages through email, datagrams, sockets, or to an HTTP Server. New "

"filters can select different routing based on message priority: "

":const:`~logging.DEBUG`, :const:`~logging.INFO`, :const:`~logging.WARNING`, "

":const:`~logging.ERROR`, and :const:`~logging.CRITICAL`."

msgstr ""

"informational debugging "

" HTTP "

"\\ :const:`~logging.DEBUG`\\ \\ "

":const:`~logging.INFO`\\ \\ :const:`~logging.WARNING`\\ \\ "

":const:`~logging.ERROR`\\ :const:`~logging.CRITICAL`\\ "

#: ../../tutorial/stdlib2.rst:240

msgid ""

"The logging system can be configured directly from Python or can be loaded "

"from a user editable configuration file for customized logging without "

"altering the application."

msgstr " Python "

#: ../../tutorial/stdlib2.rst:248

msgid "Weak References"

msgstr ""

#: ../../tutorial/stdlib2.rst:250

msgid ""

"Python does automatic memory management (reference counting for most objects"

" and :term:`garbage collection` to eliminate cycles). The memory is freed "

"shortly after the last reference to it has been eliminated."

msgstr ""

"Python :term:`garbage collection` "

#: ../../tutorial/stdlib2.rst:254

msgid ""

"This approach works fine for most applications but occasionally there is a "

"need to track objects only as long as they are being used by something else."

" Unfortunately, just tracking them creates a reference that makes them "

"permanent. The :mod:`weakref` module provides tools for tracking objects "

"without creating a reference. When the object is no longer needed, it is "

"automatically removed from a weakref table and a callback is triggered for "

"weakref objects. Typical applications include caching objects that are "

"expensive to create::"

msgstr ""

" "

":mod:`weakref` "

" ::"

#: ../../tutorial/stdlib2.rst:289

msgid "Tools for Working with Lists"

msgstr ""

#: ../../tutorial/stdlib2.rst:291

msgid ""

"Many data structure needs can be met with the built-in list type. However, "

"sometimes there is a need for alternative implementations with different "

"performance trade-offs."

msgstr " "

#: ../../tutorial/stdlib2.rst:295

msgid ""

"The :mod:`array` module provides an :class:`~array.array()` object that is "

"like a list that stores only homogeneous data and stores it more compactly."

" The following example shows an array of numbers stored as two byte "

"unsigned binary numbers (typecode ``\"H\"``) rather than the usual 16 bytes "

"per entry for regular lists of Python int objects::"

msgstr ""

":mod:`array` :class:`~array.array()` "

" ( ``\"H\"``) Python"

" int 16 ::"

#: ../../tutorial/stdlib2.rst:308

msgid ""

"The :mod:`collections` module provides a :class:`~collections.deque()` "

"object that is like a list with faster appends and pops from the left side "

"but slower lookups in the middle. These objects are well suited for "

"implementing queues and breadth first tree searches::"

msgstr ""

":mod:`collections` :class:`~collections.deque()` "

" ::"

#: ../../tutorial/stdlib2.rst:329

msgid ""

"In addition to alternative list implementations, the library also offers "

"other tools such as the :mod:`bisect` module with functions for manipulating"

" sorted lists::"

msgstr " :mod:`bisect` ::"

#: ../../tutorial/stdlib2.rst:339

msgid ""

"The :mod:`heapq` module provides functions for implementing heaps based on "

"regular lists. The lowest valued entry is always kept at position zero. "

"This is useful for applications which repeatedly access the smallest element"

" but do not want to run a full list sort::"

msgstr ""

":mod:`heapq` "

"::"

#: ../../tutorial/stdlib2.rst:355

msgid "Decimal Floating Point Arithmetic"

msgstr ""

#: ../../tutorial/stdlib2.rst:357

msgid ""

"The :mod:`decimal` module offers a :class:`~decimal.Decimal` datatype for "

"decimal floating point arithmetic. Compared to the built-in :class:`float` "

"implementation of binary floating point, the class is especially helpful for"

msgstr ""

":mod:`decimal` :class:`~decimal.Decimal` "

":class:`float` "

#: ../../tutorial/stdlib2.rst:361

msgid ""

"financial applications and other uses which require exact decimal "

"representation,"

msgstr ""

#: ../../tutorial/stdlib2.rst:363

msgid "control over precision,"

msgstr ""

#: ../../tutorial/stdlib2.rst:364

msgid "control over rounding to meet legal or regulatory requirements,"

msgstr ""

#: ../../tutorial/stdlib2.rst:365

msgid "tracking of significant decimal places, or"

msgstr ""

#: ../../tutorial/stdlib2.rst:366

msgid ""

"applications where the user expects the results to match calculations done "

"by hand."

msgstr ""

#: ../../tutorial/stdlib2.rst:369

msgid ""

"For example, calculating a 5% tax on a 70 cent phone charge gives different "

"results in decimal floating point and binary floating point. The difference "

"becomes significant if the results are rounded to the nearest cent::"

msgstr "705::"

#: ../../tutorial/stdlib2.rst:379

msgid ""

"The :class:`~decimal.Decimal` result keeps a trailing zero, automatically "

"inferring four place significance from multiplicands with two place "

"significance. Decimal reproduces mathematics as done by hand and avoids "

"issues that can arise when binary floating point cannot exactly represent "

"decimal quantities."

msgstr ""

":class:`~decimal.Decimal` Decimal "

#: ../../tutorial/stdlib2.rst:385

msgid ""

"Exact representation enables the :class:`~decimal.Decimal` class to perform "

"modulo calculations and equality tests that are unsuitable for binary "

"floating point::"

msgstr " :class:`~decimal.Decimal` ::"

#: ../../tutorial/stdlib2.rst:399

msgid ""

"The :mod:`decimal` module provides arithmetic with as much precision as "

"needed::"

msgstr ":mod:`decimal` ::"

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