math.sqrt

I'm on the bench at work, so I spend my days following along with examples
in Python books. Whenever there is a choice to use x**0.5 or math.sqrt(x)
the books opt for the square root option instead of the equivalent
representation as a fractional power. Is the implementation of math.sqrt()
more efficient than x**0.5? Is there a numerical shortcut to the value of
sqrt(x) that will make the sqrt symbol more efficient than the power
equivalent (x^0.5) in every programming language?

I have a math degree, and sometimes it is irksome since x**(1/2) or x^(1/2)
is symbolically more elegant in the formula.
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