def f(st): st.append('x') return stst=['a']st=f(st)print(st)结果是 A: ['a','x'] B: ['a'] C: ['x'] D: ['x','a']
def f(st): st.append('x') return stst=['a']st=f(st)print(st)结果是 A: ['a','x'] B: ['a'] C: ['x'] D: ['x','a']
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