python3 outputs 26 uppercase and lowercase English letters

import string


words1 = list(string.ascii_uppercase)  # 26个大写英文字母
print(words1)

words2 = list(string.ascii_lowercase)  # 26个小写英文字母
print(words2)

words3 = list(string.ascii_letters)  # 52个小写和大写英文字母
print(words3)