username ='xiaoming'
age = 18
hello = f'我的名字叫{username},今年{age}岁'
print(hello )
print(username. upper())
print(len(username))
dXNlcm5hbWUgPSd4aWFvbWluZycKYWdlID0gMTgJCmhlbGxvID0gZifmiJHnmoTlkI3lrZflj6t7dXNlcm5hbWV977yM5LuK5bm0e2FnZX3lsoEnCnByaW50KGhlbGxvCSkKcHJpbnQodXNlcm5hbWUuCXVwcGVyKCkpCnByaW50KGxlbih1c2VybmFtZSkp