username='xiaoming'
age=18
hello=f'我得名字叫{username},今年{18}岁'
print(hello)
print(username.upper())
print(len(username))
dXNlcm5hbWU9J3hpYW9taW5nJwphZ2U9MTgKaGVsbG89ZifmiJHlvpflkI3lrZflj6t7dXNlcm5hbWV9LOS7iuW5tHsxOH3lsoEnCnByaW50KGhlbGxvKQpwcmludCh1c2VybmFtZS51cHBlcigpKQpwcmludChsZW4odXNlcm5hbWUpKQ==