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- .. -*- mode: rst; encoding: utf-8 -*-
- ==========================
- Number Formatting
- ==========================
- .. contents:: Contents
- :depth: 2
- .. sectnum::
- Support for locale-specific formatting and parsing of numbers is provided by
- the ``babel.numbers`` module:
- .. code-block:: pycon
- >>> from babel.numbers import format_number, format_decimal, format_percent
- Examples:
- .. code-block:: pycon
- >>> format_decimal(1.2345, locale='en_US')
- u'1.234'
- >>> format_decimal(1.2345, locale='sv_SE')
- u'1,234'
- >>> format_decimal(12345, locale='de_DE')
- u'12.345'
- Pattern Syntax
- ==============
- While Babel makes it simple to use the appropriate number format for a given
- locale, you can also force it to use custom patterns. As with date/time
- formatting patterns, the patterns Babel supports for number formatting are
- based on the `Locale Data Markup Language specification`_ (LDML).
- Examples:
- .. code-block:: pycon
- >>> format_decimal(-1.2345, format='#,##0.##;-#', locale='en')
- u'-1.23'
- >>> format_decimal(-1.2345, format='#,##0.##;(#)', locale='en')
- u'(1.23)'
- The syntax for custom number format patterns is described in detail in the
- the specification. The following table is just a relatively brief overview.
- .. _`Locale Data Markup Language specification`: http://unicode.org/reports/tr35/#Number_Format_Patterns
- +----------+-----------------------------------------------------------------+
- | Symbol | Description |
- +==========+=================================================================+
- | ``0`` | Digit |
- +----------+-----------------------------------------------------------------+
- | ``1-9`` | '1' through '9' indicate rounding. |
- +----------+-----------------------------------------------------------------+
- | ``@`` | Significant digit |
- +----------+-----------------------------------------------------------------+
- | ``#`` | Digit, zero shows as absent |
- +----------+-----------------------------------------------------------------+
- | ``.`` | Decimal separator or monetary decimal separator |
- +----------+-----------------------------------------------------------------+
- | ``-`` | Minus sign |
- +----------+-----------------------------------------------------------------+
- | ``,`` | Grouping separator |
- +----------+-----------------------------------------------------------------+
- | ``E`` | Separates mantissa and exponent in scientific notation |
- +----------+-----------------------------------------------------------------+
- | ``+`` | Prefix positive exponents with localized plus sign |
- +----------+-----------------------------------------------------------------+
- | ``;`` | Separates positive and negative subpatterns |
- +----------+-----------------------------------------------------------------+
- | ``%`` | Multiply by 100 and show as percentage |
- +----------+-----------------------------------------------------------------+
- | ``‰`` | Multiply by 1000 and show as per mille |
- +----------+-----------------------------------------------------------------+
- | ``¤`` | Currency sign, replaced by currency symbol. If doubled, |
- | | replaced by international currency symbol. If tripled, uses the |
- | | long form of the decimal symbol. |
- +----------+-----------------------------------------------------------------+
- | ``'`` | Used to quote special characters in a prefix or suffix |
- +----------+-----------------------------------------------------------------+
- | ``*`` | Pad escape, precedes pad character |
- +----------+-----------------------------------------------------------------+
- Parsing Numbers
- ===============
- Babel can also parse numeric data in a locale-sensitive manner:
- .. code-block:: pycon
- >>> from babel.numbers import parse_decimal, parse_number
- Examples:
- .. code-block:: pycon
- >>> parse_decimal('1,099.98', locale='en_US')
- 1099.98
- >>> parse_decimal('1.099,98', locale='de')
- 1099.98
- >>> parse_decimal('2,109,998', locale='de')
- Traceback (most recent call last):
- ...
- NumberFormatError: '2,109,998' is not a valid decimal number
- .. note:: Number parsing is not properly implemented yet
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