在python中通过计算每个字符串的字母数来转换字符串

def count_letters(strings):
    letter_counts = []
    for string in strings:
        count = sum(c.isalpha() for c in string)
        letter_counts.append(count)
    return letter_counts

# 示例使用
strings = ["Hello, World!", "Python Programming", "AI & Machine Learning"]
counts = count_letters(strings)
print(counts)  # 输出: [10, 17, 16]

import unicodedata

def count_letters_unicode(strings):
    letter_counts = []
    for string in strings:
        normalized_string = unicodedata.normalize('NFD', string)
        count = sum(c.isalpha() for c in normalized_string)
        letter_counts.append(count)
    return letter_counts

def count_letters_case_sensitive(strings):
    letter_counts = []
    for string in strings:
        count_upper = sum(c.isupper() for c in string)
        count_lower = sum(c.islower() for c in string)
        letter_counts.append((count_upper, count_lower))
    return letter_counts