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authorGeorg Brandl <georg@python.org>2007-08-15 14:28:22 (GMT)
committerGeorg Brandl <georg@python.org>2007-08-15 14:28:22 (GMT)
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+
+:mod:`fpformat` --- Floating point conversions
+==============================================
+
+.. module:: fpformat
+ :synopsis: General floating point formatting functions.
+.. sectionauthor:: Moshe Zadka <moshez@zadka.site.co.il>
+
+
+The :mod:`fpformat` module defines functions for dealing with floating point
+numbers representations in 100% pure Python.
+
+.. note::
+
+ This module is unneeded: everything here could be done via the ``%`` string
+ interpolation operator.
+
+The :mod:`fpformat` module defines the following functions and an exception:
+
+
+.. function:: fix(x, digs)
+
+ Format *x* as ``[-]ddd.ddd`` with *digs* digits after the point and at least one
+ digit before. If ``digs <= 0``, the decimal point is suppressed.
+
+ *x* can be either a number or a string that looks like one. *digs* is an
+ integer.
+
+ Return value is a string.
+
+
+.. function:: sci(x, digs)
+
+ Format *x* as ``[-]d.dddE[+-]ddd`` with *digs* digits after the point and
+ exactly one digit before. If ``digs <= 0``, one digit is kept and the point is
+ suppressed.
+
+ *x* can be either a real number, or a string that looks like one. *digs* is an
+ integer.
+
+ Return value is a string.
+
+
+.. exception:: NotANumber
+
+ Exception raised when a string passed to :func:`fix` or :func:`sci` as the *x*
+ parameter does not look like a number. This is a subclass of :exc:`ValueError`
+ when the standard exceptions are strings. The exception value is the improperly
+ formatted string that caused the exception to be raised.
+
+Example::
+
+ >>> import fpformat
+ >>> fpformat.fix(1.23, 1)
+ '1.2'
+