Return the arc tangent (measured in radians) of y/x.
Unlike atan(y/x), the signs of both x and y are considered.
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Return the mantissa and exponent of x, as pair (m, e).
m is a float and e is an int, such that x = m * 2.**e.
If x is 0, m and e are both 0. Else 0.5 <= abs(m) < 1.0.
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Return an accurate floating point sum of values in the iterable.
Assumes IEEE-754 floating point arithmetic.
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log(x[, base]) -> the logarithm of x to the given base.
If the base not specified, returns the natural logarithm (base e) of x.
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Return the fractional and integer parts of x. Both results carry the sign
of x. The integer part is returned as a real.
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