Python活力练习Day23

Day23：求出两个字符串之间的编辑距离

eg：input :str1 = "intention" str2 = "execution"

　　output : 5

#详细解释参见链接 https://www.cnblogs.com/xiaodangdang/p/12165303.html

def string_distance(str1, str2):
    """
    计算两个字符串之间的编辑距离
    @author: 
    @date: 
    :param str1:
    :param str2:
    :return:
    """
    m = len(str1)
    n = len(str2)
    distance = np.zeros((m + 1, n + 1))

    for i in range(0, m + 1):
        distance[i, 0] = i
    for i in range(0, n + 1):
        distance[0, i] = i

    for i in range(1, m + 1):
        for j in range(1, n + 1):
            if str1[i - 1] == str2[j - 1]:
                cost = 0
            else:
                cost = 1
            distance[i, j] = min(distance[i - 1, j] + 1, distance[i, j - 1] + 1,
                                 distance[i - 1, j - 1] + cost)  # 分别对应删除、插入和替换

    return distance[m, n]


if __name__ == '__main__':
    str1 = "intention"
    str2 = "execution"
    result = string_distance(str1, str2)
    print(result)

输出结果 ： 5