编写代码：随机生成40个字符，字符来源为A，B，C，D，统计每个字符的个数保存在字典中，并输出个数最多的字符

import random

chars = ['A', 'B', 'C', 'D']
char_dict = {}
for i in range(40):
    char = random.choice(chars)
    if char in char_dict:
        char_dict[char] += 1
    else:
        char_dict[char] = 1

print(char_dict)

max_char = max(char_dict, key=char_dict.get)
print(f"The character that appears most frequently is {max_char}, with {char_dict[max_char]} occurrences.")

输出示例：

{'A': 9, 'C': 10, 'D': 11, 'B': 10}
The character that appears most frequently is D, with 11 occurrences.