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SF bug #422177: Results from .pyc differs from .py

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Store floats and doubles to full precision in marshal.
Test that floats read from .pyc/.pyo closely match those read from .py.
Declare PyFloat_AsString() in floatobject header file.
Add new PyFloat_AsReprString() API function.
Document the functions declared in floatobject.h.
This commit is contained in:
Tim Peters 2001-05-08 15:19:57 +00:00
parent 569c09c013
commit 72f98e9b83
4 changed files with 35 additions and 9 deletions
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27
Include/floatobject.h
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@ -20,13 +20,32 @@ extern DL_IMPORT(PyTypeObject) PyFloat_Type;
#define PyFloat_Check(op) ((op)->ob_type == &PyFloat_Type)
extern DL_IMPORT(PyObject *) PyFloat_FromString(PyObject*, char**);
extern DL_IMPORT(PyObject *) PyFloat_FromDouble(double);
extern DL_IMPORT(double) PyFloat_AsDouble(PyObject *);
/* Return Python float from string PyObject. Second argument ignored on
input, and, if non-NULL, NULL is stored into *junk (this tried to serve a
purpose once but can't be made to work as intended). */
extern DL_IMPORT(PyObject *) PyFloat_FromString(PyObject*, char** junk);
/* Macro, trading safety for speed */
/* Return Python float from C double. */
extern DL_IMPORT(PyObject *) PyFloat_FromDouble(double);
/* Extract C double from Python float. The macro version trades safety for
speed. */
extern DL_IMPORT(double) PyFloat_AsDouble(PyObject *);
#define PyFloat_AS_DOUBLE(op) (((PyFloatObject *)(op))->ob_fval)
/* Write repr(v) into the char buffer argument, followed by null byte. The
buffer must be "big enough"; >= 100 is very safe.
PyFloat_AsReprString(buf, x) strives to print enough digits so that
PyFloat_FromString(buf) then reproduces x exactly. */
extern DL_IMPORT(void) PyFloat_AsReprString(char*, PyFloatObject *v);
/* Write str(v) into the char buffer argument, followed by null byte. The
buffer must be "big enough"; >= 100 is very safe. Note that it's
unusual to be able to get back the float you started with from
PyFloat_AsString's result -- use PyFloat_AsReprString() if you want to
preserve precision across conversions. */
extern DL_IMPORT(void) PyFloat_AsString(char*, PyFloatObject *v);
#ifdef __cplusplus
}
#endif