Referencia de la Biblioteca de Python

Anterior: 4.5 struct Niv. superior: 4. Servicios de cadenas Siguiente: 4.7 StringIO

---

4.6 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.

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'

---

Referencia de la Biblioteca de Python

Anterior: 4.5 struct Niv. superior: 4. Servicios de cadenas Siguiente: 4.7 StringIO