How to express subscript in python

How to express subscript in python? Let me give you a detailed introduction to how to express:

The superscript in mathematical formulas uses the ^ symbol, and the subscript uses the _ symbol.

If the superscript and subscript have only one symbol, they do not need to be enclosed in curly braces;

If the superscript and subscript have more than one character, they must be enclosed in curly braces.

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Example:

a_1, a_2, \dots, a_n \newline
a_1^2, a_2^2, \dots, a_n^2\newline
2016^{2016}\newline
a_{2016}

Effect:

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