3.4. ExponentiationBinary ** is the exponentiation operator. Note that it binds even more tightly than unary minus, so 2**4 is (2**4), not (2)**4. The operator is implemented using C's pow(3) function, which works with floatingpoint numbers internally. It calculates using logarithms, which means that it works with fractional powers, but you sometimes get results that aren't as exact as a straight multiplication would produce. Copyright © 2001 O'Reilly & Associates. All rights reserved. 
