username = 'xiaoming'
age = 18
hello = f'我的名字叫 username ,今年 age 岁'
print( hello )
print(username. upper ())
print( len (username))
dXNlcm5hbWUgPSAJJ3hpYW9taW5nJwphZ2UgPSAJMTgJCQpoZWxsbyA9IGYn5oiR55qE5ZCN5a2X5Y+rCXVzZXJuYW1lCQnvvIzku4rlubQJYWdlCeWygScKcHJpbnQoCWhlbGxvCQkpCnByaW50KHVzZXJuYW1lLgl1cHBlcgkJKCkpCnByaW50KAkJbGVuCSh1c2VybmFtZSkpCg==