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(python2.1-ref.info)Numeric literals

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Numeric literals
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There are four types of numeric literals: plain integers, long
integers, floating point numbers, and imaginary numbers.  There are no
complex literals (complex numbers can be formed by adding a real number
and an imaginary number).

Note that numeric literals do not include a sign; a phrase like `-1' is
actually an expression composed of the unary operator ``-'' and the
literal `1'.