Which is faster in Python: x**.5 or math.sqrt(x)?

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I"ve been wondering this for some time. As the title say, which is faster, the actual function or simply raising to the half power?

UPDATE

This is not a matter of premature optimization. This is simply a question of how the underlying code actually works. What is the theory of how Python code works?

I sent Guido van Rossum an email cause I really wanted to know the differences in these methods.

My email:

There are at least 3 ways to do a square root in Python: math.sqrt, the "**" operator and pow(x,.5). I"m just curious as to the differences in the implementation of each of these. When it comes to efficiency which is better?

His response:

pow and ** are equivalent; math.sqrt doesn"t work for complex numbers, and links to the C sqrt() function. As to which one is faster, I have no idea...

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