Elements of a sequence can be referred to using square brackets and a zero-based index, just as with arrays in Java. For example, (4, 5, 6)[2] is 6.

Python also supports negative indices, which count down from the end of the sequence. For instance, (4, 5, 6)[-3] is the third element from the end of (4, 5, 6), which is 4. Similarly, (4, 5, 6, 7)[-3] is 5.

String indexing in Python behaves a little differently than the indexing of other sequences. Because Python has no character type, individual characters are automatically converted to strings. For example, 'Python'[0] is not the character "P" but a string, 'P', that has "P" as its only character.

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