How does assignment work with list slices?

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You are confusing two distinct operation that use very similar syntax:

1) slicing:

b = a[0:2]

This makes a copy of the slice of a and assigns it to b.

2) slice assignment:

a[0:2] = b

This replaces the slice of a with the contents of b.

Although the syntax is similar (I imagine by design!), these are two different operations.

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