python中的startswith函数

Question

a = "hello world and itcast and hello itheima and PYTHON"
print(a.startswith("hello",0,4))

为什么结果是false呢，0到四个字符明明是hello，满足hello开头啊

Answer 1

a = "hello world and itcast and hello itheima and PYTHON"
print(a.startswith("hello",0,5))

hello的长度是5

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