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  1.  
  2. username="xiaoming"
  3. age=18
  4. hello=f"我的名字叫{username},今年{age}岁."
  5. print(hello)
  6. print(username.upper())
  7. print(len(username))
  8.  
Success #stdin #stdout 0.1s 14048KB
stdin
Standard input is empty
stdout
我的名字叫xiaoming,今年18岁.
XIAOMING
8