[Tutor] How does slicing work?

[Kanone Seele]

Hello,I'm a beginner in python.I found some qustions in Chapter 9's Quiz of
the book* Learning Python,4th ed*,

>>> L = [1, 2, 3, 4]

>>> L[-1000:100]

[1, 2, 3, 4]

>>> L[3:1]

[]

>>> L[3:1] = ['?']

>>> L

[1, 2, 3, '?', 4]


How does python get the result of slicing?Such as the examples above,they
really confused me.
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