python要求找出字符串中出现次数最多的字符并统计出现了多少次

可以使用 Python 中的字典来统计字符出现的次数。具体步骤如下：

1. 定义一个空字典 `char_dict` 用于存储每个字符出现的次数。
2. 遍历字符串中的每个字符，如果该字符不在 `char_dict` 中，就将其添加为键，值为 1；否则将该字符对应的值加 1。
3. 遍历 `char_dict`，找到出现次数最多的字符和对应的出现次数。
4. 返回出现次数最多的字符和对应的出现次数。

下面是示例代码：

def find_most_frequent_char(s):
    char_dict = {}
    for c in s:
        if c not in char_dict:
            char_dict[c] = 1
        else:
            char_dict[c] += 1
    max_count = 0
    max_char = ''
    for c, count in char_dict.items():
        if count > max_count:
            max_count = count
            max_char = c
    return max_char, max_count

使用示例：

s = 'hello world'
max_char, max_count = find_most_frequent_char(s)
print(f'The most frequent character in "{s}" is "{max_char}", which appears {max_count} times.')

输出：

The most frequent character in "hello world" is "l", which appears 3 times.