将字符串拆分成单独的字符，计算每个字符出现的次数，然后组合成单个df/矩阵

import pandas as pd

def count_characters(string):
    # 字符串拆分
    characters = list(string)
    
    # 计算字符出现次数
    char_count = {}
    for char in characters:
        if char in char_count:
            char_count[char] += 1
        else:
            char_count[char] = 1
    
    # 组合成单个df/矩阵
    df = pd.DataFrame(list(char_count.items()), columns=['Character', 'Count'])
    
    return df

# 示例用法
string = "hello"
result_df = count_characters(string)
print(result_df)

  Character  Count
0         h      1
1         e      1
2         l      2
3         o      1