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  1. username="xiaoming"
  2. print(username.upper())
  3. aa="Hello_world"
  4. print(aa.upper())
  5. print(aa[2:8])
  6. print(len(aa))
  7. print(aa[-2])
Success #stdin #stdout 0.08s 14100KB
stdin
Standard input is empty
stdout
XIAOMING
HELLO_WORLD
llo_wo
11
l