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  1. username ='xiaoming'
  2. age = 18
  3. hello = f'我的名字叫{username},今年{age}岁'
  4. print(hello )
  5. print(username. upper())
  6. print(len(username))
Success #stdin #stdout 0.1s 14152KB
stdin
Standard input is empty
stdout
我的名字叫xiaoming,今年18岁
XIAOMING
8