username = 'xiaoming'
age = 18
hello = f'我的名字叫{username},今年{age}岁'
print(hello)
print(username.upper())
print(len(username))
dXNlcm5hbWUgPSAneGlhb21pbmcnCQphZ2UgPSAxOCAJCQkKaGVsbG8gPSBmJ+aIkeeahOWQjeWtl+WPq3t1c2VybmFtZX3vvIzku4rlubR7YWdlfeWygScKcHJpbnQoaGVsbG8pCnByaW50KHVzZXJuYW1lLnVwcGVyKCkpCnByaW50KGxlbih1c2VybmFtZSkp