给出英文中26个字母在文本中出现的具体频率

可以使用Python标准库中的collections模块中的Counter类来实现字母频率的统计。以下是代码示例：

import re
from collections import Counter

# 英文文本
text = "Python is an interpreted high-level programming language for general-purpose programming. Created by Guido van Rossum and first released in 1991."

# 将所有字母转换为小写并去除非字母字符
letters = re.findall(r'[a-zA-Z]', text.lower())

# 计算字母频率
letter_counts = Counter(letters)

# 输出字母频率的统计表
for letter in 'abcdefghijklmnopqrstuvwxyz':
    count = letter_counts[letter]
    freq = count / len(letters)
    print(f'{letter}: {count}, {freq:.2%}')

运行代码后，会输出英文文本中26个字母出现的具体频率统计表。