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Python Library Reference

Previous: 4.4.4 Differ Example Up: 4. String Services Next: 4.6 StringIO

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4.5 fpformat -- Floating point conversions

The 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 fpformat module defines the following functions and an exception:

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.

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 fix() or sci() as the x parameter does not look like a number. This is a subclass of 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'

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Python Library Reference

Previous: 4.4.4 Differ Example Up: 4. String Services Next: 4.6 StringIO

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Release 2.2.3, documentation updated on 30 May 2003.