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(python2.1-ref.info)Imaginary literals

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Imaginary literals
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Imaginary literals are described by the following lexical definitions:

     imagnumber:     (floatnumber | intpart) ("j"|"J")

An imaginary literal yields a complex number with a real part of 0.0.
Complex numbers are represented as a pair of floating point numbers and
have the same restrictions on their range.  To create a complex number
with a nonzero real part, add a floating point number to it, e.g.,
`(3+4j)'.  Some examples of imaginary literals:

     3.14j   10.j    10j     .001j   1e100j  3.14e-10j