快速字符串数组 - Cython

问题描述

限时删除！！

有以下假设代码:

cdef extern from "string.h":
    int strcmp(char* str1, char* str2)

def foo(list_str1, list_str2):
    cdef unsigned int i, j
    c_arr1 = ??
    c_arr2 = ??
    for i in xrange(len(list_str1)):
        for j in xrange(len(list_str2)):
            if not strcmp(c_arr1[i], c_arr2[j]):
                do some funny stuff

有什么方法可以将列表转换为 c 数组吗?

is there some way how to convert the lists to c arrays?

我已经阅读并尝试过 Cython - 将字符串列表转换为字符 ** 但这只会引发错误.

I have read and tried Cython - converting list of strings to char ** but that only throws errors.

推荐答案

试试下面的代码.下面代码中的to_cstring_array函数就是你想要的.

Try following code. to_cstring_array function in the following code is what you want.

from libc.stdlib cimport malloc, free
from libc.string cimport strcmp
from cpython.string cimport PyString_AsString

cdef char ** to_cstring_array(list_str):
    cdef char **ret = <char **>malloc(len(list_str) * sizeof(char *))
    for i in xrange(len(list_str)):
        ret[i] = PyString_AsString(list_str[i])
    return ret

def foo(list_str1, list_str2):
    cdef unsigned int i, j
    cdef char **c_arr1 = to_cstring_array(list_str1)
    cdef char **c_arr2 = to_cstring_array(list_str2)

    for i in xrange(len(list_str1)):
        for j in xrange(len(list_str2)):
            if i != j and strcmp(c_arr1[i], c_arr2[j]) == 0:
                print i, j, list_str1[i]
    free(c_arr1)
    free(c_arr2)

foo(['hello', 'python', 'world'], ['python', 'rules'])

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