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Metadata-Version: 1.0

Name: PyICU

Version: 0.8.1

Summary: Python extension wrapping the ICU C++ API

Home-page: http://pyicu.osafoundation.org/

Author: Open Source Applications Foundation

Author-email: UNKNOWN

License: UNKNOWN

Description: 

        README file for PyICU

        ---------------------

        Contents

        --------

        - Welcome

        - Building PyICU

        - Running PyICU

        - What's available

        - API Documentation

        Welcome

        -------

        Welcome to PyICU, a Python extension wrapping IBM's International

        Components for Unicode C++ library (ICU).

        PyICU is a project maintained by the Open Source Applications Foundation.

        IBM's ICU homepage is: http://www-306.ibm.com/software/globalization/icu/

        Building PyICU

        --------------

        Before building PyICU the ICU 3.6 or 3.8 libraries must be built and

        installed. Refer to each system's instructions for more information.

        As of version 0.5 PyICU no longer uses SWIG.

        As of version 0.8 PyICU is built with distutils or setuptools:

        - verify that the INCLUDES, LFLAGS, CFLAGS and LIBRARIES dictionaries in

        setup.py contain correct values for your platform

        - python setup.py build

        - sudo python setup.py install

        Running PyICU

        -------------

        . Mac OS X

        Make sure that DYLD_LIBRARY_PATH contains paths to the directory(ies)

        containing the ICU libs.

        . Linux

        Make sure that LD_LIBRARY_PATH contains paths to the directory(ies)

        containing the ICU libs or that you added the corresponding -rpath

        argument to LFLAGS.

        . Windows

        Make sure that PATH contains paths to the directory(ies)

        containing the ICU DLLs.

        What's available

        ----------------

        PyICU is under active development. Currently, the string, locale, format,

        calendar, timezone, charset and various iterator classes are available.

        See the CHANGES file for an up to date log of changes and additions.

        API Documentation

        -----------------

        At the moment, there is no API documentation for PyICU. The API for ICU is

        documented at http://icu.sourceforge.net/apiref/icu4c/ and the following

        patterns can be used to translate from the C++ APIs to the corresponding

        Python APIs.

        - strings

        The ICU string type, UnicodeString, is a type pointing at a mutable

        array of UChar Unicode 16-bit wide characters. The Python unicode type

        is an immutable string of 16-bit or 32-bit wide Unicode characters.

        Because of these differences, UnicodeString and Python's unicode type

        are not merged into the same type when crossing the C++ boundary.

        ICU APIs taking UnicodeString arguments have been overloaded to also

        accept Python str or unicode type arguments. In the case of str objects,

        utf-8 encoding is assumed when converting them to UnicodeString

        objects.

        To convert a Python str encoded in a encoding other than utf-8 to an ICU

        UnicodeString use the UnicodeString(str, encodingName) constructor.

        ICU's C++ APIs accept and return UnicodeString arguments in several

        ways: by value, by pointer or by reference.

        When an ICU C++ API is documented to accept a UnicodeString & parameter,

        it is safe to assume that there are several corresponding PyICU python

        APIs making it accessible in simpler ways:

        For example, the 'UnicodeString &Locale::getDisplayName(UnicodeString &)'

        API, documented here:

        http://icu.sourceforge.net/apiref/icu4c/classLocale.html#a19

        can be invoked from Python in several ways:

        1. The ICU way

        >>> from PyICU import UnicodeString, Locale

        >>> locale = Locale('pt_BR')

        >>> string = UnicodeString()

        >>> name = locale.getDisplayName(string)

        >>> name

        <UnicodeString: Portuguese (Brazil)>

        >>> name is string

        True                  <-- string arg was returned, modified in place

        2. The Python way

        >>> from PyICU import Locale

        >>> locale = Locale('pt_BR')

        >>> name = locale.getDisplayName()

        >>> name

        <UnicodeString: Portuguese (Brazil)>

        A UnicodeString object was allocated for Python and returned.

        A UnicodeString can be coerced to a Python unicode string with Python's

        unicode() constructor. The usual len(), str(), comparison, [] and [:]

        operators are all available, with the additional twists that slicing is

        not read-only and that += is also available since a UnicodeString is

        mutable. For example:

        >>> name = locale.getDisplayName()

        <UnicodeString: Portuguese (Brazil)>

        >>> unicode(name)

        u'Portuguese (Brazil)'

        >>> len(name)

        19

        >>> str(name)           <-- works when chars fit with default encoding

        'Portuguese (Brazil)'

        >>> name[3]

        u't'

        >>> name[12:18]

        <UnicodeString: Brazil>

        >>> name[12:18] = 'the country of Brasil'

        >>> name

        <UnicodeString: Portuguese (the country of Brasil)>

        >>> name += ' oh joy'

        >>> name

        <UnicodeString: Portuguese (the country of Brasil) oh joy>

        - error reporting

        The C++ ICU library does not use C++ exceptions to report errors. ICU

        C++ APIs return errors via a UErrorCode reference argument. All such

        APIs are wrapped by Python APIs that omit this argument and throw an

        ICUError Python exception instead. The same is true for ICU APIs taking

        both a ParseError and a UErrorCode, they are both to be omitted.

        For example, the 'UnicodeString &DateFormat::format(const Formattable &,

        UnicodeString &, UErrorCode &)' API, documented here

        http://icu.sourceforge.net/apiref/icu4c/classDateFormat.html#a6

        is invoked from Python with:

        >>> from PyICU import DateFormat, Formattable

        >>> df = DateFormat.createInstance()

        >>> df

        <SimpleDateFormat: M/d/yy h:mm a>

        >>> f = Formattable(940284258.0, Formattable.kIsDate)

        >>> df.format(f)

        <UnicodeString: 10/18/99 3:04 PM>

        Of course, the simpler 'UnicodeString &DateFormat::format(UDate,

        UnicodeString &)' documented here:

        http://icu.sourceforge.net/apiref/icu4c/classDateFormat.html#a5

        can be used too:

        >>> from PyICU import DateFormat

        >>> df = DateFormat.createInstance()

        >>> df

        <SimpleDateFormat: M/d/yy h:mm a>

        >>> df.format(940284258.0)

        <UnicodeString: 10/18/99 3:04 PM>

        - dates

        ICU uses a double floating point type called UDate that represents the

        number of milliseconds elapsed since 1970-jan-01 UTC for dates.

        In Python, the value returned by the time module's time() function is

        the number of seconds since 1970-jan-01 UTC. Because of this difference,

        floating point values are multiplied by 1000 when passed to APIs taking

        UDate and divided by 1000 when returned as UDate.

        Python's datetime objects, with or without timezone information, can

        also be used with APIs taking UDate arguments. The datetime objects get

        converted to UDate when crossing into the C++ layer.

        - arrays

        Many ICU API take array arguments. A list of elements of the array

        element types is to be passed from Python.

        - StringEnumeration

        An ICU StringEnumeration has three 'next' methods: next() which returns

        a 'str' objects, unext() which returns 'unicode' objects and snext()

        which returns 'UnicodeString' objects.

        Any of these methods can be used as an iterator, using the Python

        built-in 'iter' function.

        For example, let e be a StringEnumeration instance:

        [s for s in e] is a list of 'str' objects

        [s for s in iter(e.unext, None)] is a list of 'unicode' objects

        [s for s in iter(e.snext, None)] is a list of 'UnicodeString' objects

        - timezones

        The ICU TimeZone type may be wrapped with an ICUtzinfo type for usage

        with Python's datetime type. For example:

        tz = ICUtzinfo(TimeZone.createTimeZone('US/Mountain'))

        datetime.now(tz)

        or, even simpler:

        tz = ICUtzinfo.getInstance('Pacific/Fiji')

        datetime.now(tz)

        To get the default time zone use:

        defaultTZ = ICUtzinfo.getDefault()

        To get the time zone's id, use the 'tzid' attribute or coerce the time

        zone to a string:

        ICUtzinfo.getInstance('Pacific/Fiji').tzid -> 'Pacific/Fiji'

        str(ICUtzinfo.getInstance('Pacific/Fiji')) -> 'Pacific/Fiji'

Platform: UNKNOWN