username = 'xiaoming'
age = 18
hello = f'我的名字叫{username},今年 {age}岁'
print(hello)
print(username.upper())
print(len(username))
dXNlcm5hbWUgPSAneGlhb21pbmcnCQkKYWdlID0gMTgJCQpoZWxsbyA9IGYn5oiR55qE5ZCN5a2X5Y+re3VzZXJuYW1lfe+8jOS7iuW5tAl7YWdlfeWygScKcHJpbnQoaGVsbG8pCnByaW50KHVzZXJuYW1lLnVwcGVyKCkpCnByaW50KGxlbih1c2VybmFtZSkpCgo=