python-关于list拼接的一些坑

# 相加返回的是列表,故直接打印出来 print([1, 2] + [3]) # [1, 2, 3] print([1, 2] + [[3]]) # [1, 2, [3]] a = [1, 2] # 由于append方法并不返回列表,实际上此时a已是[1, 2, 3] print(a.append(3)) # None print(a) # [1, 2, 3]

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