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/* Copyright 2000 by Jeffrey Chang. All rights reserved.
* This code is part of the Biopython distribution and governed by its
* license. Please see the LICENSE file that should have been included
* as part of this package.
*
* clistfnsmodule.c
* Created 3 Jun 2000
*/
#include "Python.h"
#include <math.h>
/************************************** Exported Functions ***********/
static char clistfns_count__doc__[] =
"count(items) -> dict of counts of each item\n\
\n\
Count the number of times each item appears in a list of data.\n\
\n\
";
static PyObject *clistfns_count(PyObject *self, PyObject *args)
{
int i;
PyObject *items, *counts;
PyObject *item, *count, *newcount;
long int current;
if(!PyArg_ParseTuple(args, "O", &items))
return NULL;
if(!PySequence_Check(items)) {
PyErr_SetString(PyExc_TypeError, "expected sequence type");
return NULL;
}
if(!(counts = PyDict_New()))
return NULL;
/* Go through the loop, counting how often each item appears. */
i = 0;
while(1) {
if(!(item = PySequence_GetItem(items, i))) {
PyErr_Clear(); /* clear the exception set by PySequence_GetItem */
break; /* no more numbers */
}
if(!(count = PyDict_GetItem(counts, item))) {
newcount = PyInt_FromLong(1); /* New item, set count to 1 */
}
else {
current = PyInt_AsLong(count);
newcount = PyInt_FromLong(current+1);
}
PyDict_SetItem(counts, item, newcount);
Py_DECREF(newcount);
Py_DECREF(item);
if(PyErr_Occurred())
return NULL;
i++;
}
return counts;
}
static char clistfns_contents__doc__[] =
"contents(items) -> dict of item -> percentage\n\
\n\
Summarize the contents of the list in terms of the percentages of each\n\
item. For example, if an item appears 3 times in a list with 10 items,\n\
it is in 0.3 of the list\n\
\n\
";
static PyObject *clistfns_contents(PyObject *self, PyObject *args)
{
int i;
PyObject *items, *counts, *percentages;
PyObject *countitems, *countitem;
PyObject *key, *count, *perc;
long c;
double total;
if(!PyArg_ParseTuple(args, "O", &items))
return NULL;
if(!PySequence_Check(items)) {
PyErr_SetString(PyExc_TypeError, "expected mapping type");
return NULL;
}
if((total = PySequence_Length(items)) == -1) {
PyErr_SetString(PyExc_ValueError, "I couldn't get length of item.");
return NULL;
}
counts = clistfns_count(self, args);
if(!counts || PyErr_Occurred())
return NULL;
if(!(percentages = PyDict_New())) {
Py_DECREF(counts);
return NULL;
}
/* Loop through every element in counts, calculating the probabilities. */
if(!(countitems = PyMapping_Items(counts))) {
Py_DECREF(counts);
Py_DECREF(percentages);
return NULL;
}
/* Go through the loop, counting how often each item appears. */
i = 0;
while(1) {
if(!(countitem = PyList_GetItem(countitems, i))) {
PyErr_Clear(); /* clear the exception set by PyList_GetItem */
break; /* no more numbers */
}
key = PyTuple_GetItem(countitem, 0);
count = PyTuple_GetItem(countitem, 1);
c = PyInt_AsLong(count);
perc = PyFloat_FromDouble((double)c / total);
PyDict_SetItem(percentages, key, perc);
Py_DECREF(perc);
if(PyErr_Occurred()) /* PyDict_SetItem failed */
break;
i++;
}
if(PyErr_Occurred()) {
Py_DECREF(percentages);
percentages = NULL;
}
Py_DECREF(countitems);
Py_DECREF(counts);
return percentages;
}
/************************************** Module definition stuff ******/
static PyMethodDef clistfnsMethods[] = {
{"count", clistfns_count, METH_VARARGS, clistfns_count__doc__},
{"contents", clistfns_contents, METH_VARARGS, clistfns_contents__doc__},
{NULL, NULL}
};
static char clistfns__doc__[] =
"This provides helper functions for the listfns module.\n\
You should never import this module on its own.\n\
\n\
";
void initclistfns(void)
{
(void) Py_InitModule3("clistfns", clistfnsMethods, clistfns__doc__);
}
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