username = 'xiaoming'
age = 18
hello = f'我的名字叫{username},今年{age}岁'
print(hello)
print(username.upper())
print(len(username))
dXNlcm5hbWUgPSAneGlhb21pbmcnCmFnZSA9IDE4CmhlbGxvID0gZifmiJHnmoTlkI3lrZflj6t7dXNlcm5hbWV9LOS7iuW5tHthZ2V95bKBJwpwcmludChoZWxsbykKcHJpbnQodXNlcm5hbWUudXBwZXIoKSkKcHJpbnQobGVuKHVzZXJuYW1lKSk=