计算一段英文的大写字母和小写字母的数量

"""
统计给定字符串中大写字母和小写字母的数量。

该函数不接受参数，也不返回任何值，但会打印出字符串中大写字母和小写字母的数量。
"""

s = 'Yalong brand is characterized by Tibet, its products include yak meat products, Tibetan cattle products, special fast-brewing tea products, yak milk products, Tibetan fragrant pig and other Tibetan agricultural products, as well as highland barley and other unique Tibetan characteristic products.'
upper = 0  # 初始化大写字母计数器
lower = 0  # 初始化小写字母计数器

# 遍历字符串中的每个字符
for item in s:
    if item.isupper():  # 如果字符是大写字母
        upper += 1
    elif item.islower():  # 如果字符是小写字母
        lower += 1
    else:
        pass  # 忽略非大小写字母的字符

# 打印结果
print(f'大写字母有{upper}个，小写字母有{lower}个')