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gh-85988: Change documentation for sys.float_info.rounds #99675

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Nov 27, 2022
Merged

gh-85988: Change documentation for sys.float_info.rounds #99675

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a724de0
Change documentation for sys.float_info.rounds
tbwolfe Nov 22, 2022
49c9296
Merge branch 'main' into float-info-rounds-documentation
tbwolfe Nov 22, 2022
7031f9f
Correction to previous documentation change
tbwolfe Nov 22, 2022
51a2d35
Merge branch 'float-info-rounds-documentation' of github.com:tbwolfe/…
tbwolfe Nov 22, 2022
4243533
Clarify source for value of FLT_ROUNDS
tbwolfe Nov 22, 2022
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18 changes: 12 additions & 6 deletions Doc/library/sys.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -604,12 +604,18 @@ always available.
+---------------------+----------------+--------------------------------------------------+
| :const:`radix` | FLT_RADIX | radix of exponent representation |
+---------------------+----------------+--------------------------------------------------+
| :const:`rounds` | FLT_ROUNDS | integer constant representing the rounding mode |
| | | used for arithmetic operations. This reflects |
| | | the value of the system FLT_ROUNDS macro at |
| | | interpreter startup time. See section 5.2.4.2.2 |
| | | of the C99 standard for an explanation of the |
| | | possible values and their meanings. |
| :const:`rounds` | FLT_ROUNDS | integer representing the rounding mode for |
| | | floating-point arithmetic. This reflects the |
| | | value of the system FLT_ROUNDS macro at |
| | | interpreter startup time: |
| | | ``-1`` indeterminable, |
| | | ``0`` toward zero, |
| | | ``1`` to nearest, |
| | | ``2`` toward positive infinity, |
| | | ``3`` toward negative infinity |
| | | |
| | | All other values for FLT_ROUNDS characterize |
| | | implementation-defined rounding behavior. |
+---------------------+----------------+--------------------------------------------------+

The attribute :attr:`sys.float_info.dig` needs further explanation. If
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