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| author | Mark Dickinson <dickinsm@gmail.com> | 2009-04-22 17:50:21 +0000 |
|---|---|---|
| committer | Mark Dickinson <dickinsm@gmail.com> | 2009-04-22 17:50:21 +0000 |
| commit | cf63f2fb88826ae67843b8574bca6ef25c2e791f (patch) | |
| tree | 81dbf873651fdd3f9a2dcabd3c291d9911aad609 /Doc/library/fractions.rst | |
| parent | 937491d1a9a327a782f3717fd1a0d4d9ad8fdc36 (diff) | |
| download | cpython-git-cf63f2fb88826ae67843b8574bca6ef25c2e791f.tar.gz | |
Issue #5812: Make Fraction('1e6') valid. The Fraction constructor now
accepts all strings accepted by the float and Decimal constructors,
with the exception of strings representing NaNs or infinities.
Diffstat (limited to 'Doc/library/fractions.rst')
| -rw-r--r-- | Doc/library/fractions.rst | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/Doc/library/fractions.rst b/Doc/library/fractions.rst index 68a8ef6295..c135f9197a 100644 --- a/Doc/library/fractions.rst +++ b/Doc/library/fractions.rst @@ -25,21 +25,18 @@ another rational number, or from a string. :exc:`ZeroDivisionError`. The second version requires that *other_fraction* is an instance of :class:`numbers.Rational` and returns an :class:`Fraction` instance with the same value. The - last version of the constructor expects a string - instance in one of two possible forms. The first form is:: + last version of the constructor expects a string instance. The + usual form for this string is:: [sign] numerator ['/' denominator] where the optional ``sign`` may be either '+' or '-' and ``numerator`` and ``denominator`` (if present) are strings of - decimal digits. The second permitted form is that of a number - containing a decimal point:: - - [sign] integer '.' [fraction] | [sign] '.' fraction - - where ``integer`` and ``fraction`` are strings of digits. In - either form the input string may also have leading and/or trailing - whitespace. Here are some examples:: + decimal digits. In addition, any string that represents a finite + value and is accepted by the :class:`float` constructor is also + accepted by the :class:`Fraction` constructor. In either form the + input string may also have leading and/or trailing whitespace. + Here are some examples:: >>> from fractions import Fraction >>> Fraction(16, -10) @@ -57,6 +54,8 @@ another rational number, or from a string. Fraction(1414213, 1000000) >>> Fraction('-.125') Fraction(-1, 8) + >>> Fraction('7e-6') + Fraction(7, 1000000) The :class:`Fraction` class inherits from the abstract base class |