username ='xiaoming'
age =18
hello = f'我的名字叫username,今年age岁'
print(hello)
print(username.upper())
print(len(username))
dXNlcm5hbWUgPSd4aWFvbWluZycJCQphZ2UgPTE4CQkKaGVsbG8gPSBmJ+aIkeeahOWQjeWtl+WPq3VzZXJuYW1l77yM5LuK5bm0YWdl5bKBJwpwcmludChoZWxsbykKcHJpbnQodXNlcm5hbWUudXBwZXIoKSkKcHJpbnQobGVuKHVzZXJuYW1lKSk=