username = 'xiaoming'
age = 18
hello = f'我的名字叫{username},今年{age}岁'
print(hello)
print(username.upper())
print(len(username))
dXNlcm5hbWUgPSAneGlhb21pbmcnCmFnZSA9IDE4ICAgCmhlbGxvID0gZifmiJHnmoTlkI3lrZflj6t7dXNlcm5hbWV977yM5LuK5bm0e2FnZX3lsoEnCnByaW50KGhlbGxvKQpwcmludCh1c2VybmFtZS51cHBlcigpKQpwcmludChsZW4odXNlcm5hbWUpKQ==