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Implement PEP 238 in its (almost) full glory.

Browse source 
This introduces:

- A new operator // that means floor division (the kind of division
  where 1/2 is 0).

- The "future division" statement ("from __future__ import division)
  which changes the meaning of the / operator to implement "true
  division" (where 1/2 is 0.5).

- New overloadable operators __truediv__ and __floordiv__.

- New slots in the PyNumberMethods struct for true and floor division,
  new abstract APIs for them, new opcodes, and so on.

I emphasize that without the future division statement, the semantics
of / will remain unchanged until Python 3.0.

Not yet implemented are warnings (default off) when / is used with int
or long arguments.

This has been on display since 7/31 as SF patch #443474.

Flames to /dev/null.
This commit is contained in:
Guido van Rossum 2001-08-08 05:00:18 +00:00
parent 074c9d2b20
commit 4668b000a1
19 changed files with 476 additions and 226 deletions
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40
Python/ceval.c
View file

@ -884,6 +884,26 @@ eval_frame(PyFrameObject *f)
if (x != NULL) continue;
break;
case BINARY_FLOOR_DIVIDE:
w = POP();
v = POP();
x = PyNumber_FloorDivide(v, w);
Py_DECREF(v);
Py_DECREF(w);
PUSH(x);
if (x != NULL) continue;
break;
case BINARY_TRUE_DIVIDE:
w = POP();
v = POP();
x = PyNumber_TrueDivide(v, w);
Py_DECREF(v);
Py_DECREF(w);
PUSH(x);
if (x != NULL) continue;
break;
case BINARY_MODULO:
w = POP();
v = POP();
@ -1051,6 +1071,26 @@ eval_frame(PyFrameObject *f)
if (x != NULL) continue;
break;
case INPLACE_FLOOR_DIVIDE:
w = POP();
v = POP();
x = PyNumber_InPlaceFloorDivide(v, w);
Py_DECREF(v);
Py_DECREF(w);
PUSH(x);
if (x != NULL) continue;
break;
case INPLACE_TRUE_DIVIDE:
w = POP();
v = POP();
x = PyNumber_InPlaceTrueDivide(v, w);
Py_DECREF(v);
Py_DECREF(w);
PUSH(x);
if (x != NULL) continue;
break;
case INPLACE_MODULO:
w = POP();
v = POP();