username ='xiaoming'
age = 18
hello = f'我的名字叫{username},今年{age}岁'
print(hello)
print(username.upper())
print(len(username))
dXNlcm5hbWUgPSd4aWFvbWluZycJCmFnZSA9IDE4CQpoZWxsbyA9IGYn5oiR55qE5ZCN5a2X5Y+re3VzZXJuYW1lfe+8jOS7iuW5tHthZ2V95bKBJwpwcmludChoZWxsbykKcHJpbnQodXNlcm5hbWUudXBwZXIoKSkKcHJpbnQobGVuKHVzZXJuYW1lKSk=