Python怎么计算字符串相似度

计算字符串相似度可以使用一些算法，常用的算法包括编辑距离算法（Levenshtein Distance）、Jaccard相似度等。

以下是使用编辑距离算法计算字符串相似度的示例代码：

def levenshtein_distance(s1, s2):
    if len(s1) < len(s2):
        return levenshtein_distance(s2, s1)

    if len(s2) == 0:
        return len(s1)

    previous_row = range(len(s2) + 1)
    for i, c1 in enumerate(s1):
        current_row = [i + 1]
        for j, c2 in enumerate(s2):
            insertions = previous_row[j + 1] + 1
            deletions = current_row[j] + 1
            substitutions = previous_row[j] + (c1 != c2)
            current_row.append(min(insertions, deletions, substitutions))
        previous_row = current_row

    return previous_row[-1]

def similarity(s1, s2):
    max_length = max(len(s1), len(s2))
    distance = levenshtein_distance(s1, s2)
    similarity = 1 - distance / max_length
    return similarity

s1 = "hello"
s2 = "hallo"
similarity_score = similarity(s1, s2)
print(f"The similarity score between '{s1}' and '{s2}' is {similarity_score}")

这段代码会计算字符串 “hello” 和 “hallo” 之间的相似度，输出结果为：

The similarity score between 'hello' and 'hallo' is 0.8

你可以根据需要修改代码来计算其他字符串的相似度。