Python——built-in module Help: math

 Help on built-in module math:
 NAME
     math
 DESCRIPTION
     This module is always available.  It provides access to the
     mathematical functions defined by the C standard.
 FUNCTIONS
     acos(...)
         acos(x)

         Return the arc cosine (measured in radians) of x.

     acosh(...)
         acosh(x)

         Return the inverse hyperbolic cosine of x.

     asin(...)
         asin(x)

         Return the arc sine (measured in radians) of x.

     asinh(...)
         asinh(x)

         Return the inverse hyperbolic sine of x.

     atan(...)
         atan(x)

         Return the arc tangent (measured in radians) of x.

     atan2(...)
         atan2(y, x)

         Return the arc tangent (measured in radians) of y/x.
         Unlike atan(y/x), the signs of both x and y are considered.

     atanh(...)
         atanh(x)

         Return the inverse hyperbolic tangent of x.

     ceil(...)
         ceil(x)

         Return the ceiling of x as an Integral.
         This is the smallest integer >= x.

     copysign(...)
         copysign(x, y)

         Return a float with the magnitude (absolute value) of x but the sign
         of y. On platforms that support signed zeros, copysign(1.0, -0.0)
         returns -1.0.

     cos(...)
         cos(x)

         Return the cosine of x (measured in radians).

     cosh(...)
         cosh(x)

         Return the hyperbolic cosine of x.

     degrees(...)
         degrees(x)

         Convert angle x from radians to degrees.

     erf(...)
         erf(x)

         Error function at x.

     erfc(...)
         erfc(x)

         Complementary error function at x.

     exp(...)
         exp(x)

         Return e raised to the power of x.

     expm1(...)
         expm1(x)

         Return exp(x)-1.
         This function avoids the loss of precision involved in the direct evaluation of exp(x)-1 for small x.

     fabs(...)
         fabs(x)

         Return the absolute value of the float x.

     factorial(...)
         factorial(x) -> Integral

         Find x!. Raise a ValueError if x is negative or non-integral.

     floor(...)
         floor(x)

         Return the floor of x as an Integral.
         This is the largest integer <= x.

     fmod(...)
         fmod(x, y)

         Return fmod(x, y), according to platform C.  x % y may differ.

     frexp(...)
         frexp(x)

         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.

     fsum(...)
         fsum(iterable)

         Return an accurate floating point sum of values in the iterable.
         Assumes IEEE-754 floating point arithmetic.

     gamma(...)
         gamma(x)

         Gamma function at x.

     gcd(...)
         gcd(x, y) -> int
         greatest common divisor of x and y

     hypot(...)
         hypot(x, y)

         Return the Euclidean distance, sqrt(x*x + y*y).

     isclose(...)
         isclose(a, b, *, rel_tol=1e-09, abs_tol=0.0) -> bool

         Determine whether two floating point numbers are close in value.

            rel_tol
                maximum difference for being considered "close", relative to the
                magnitude of the input values
             abs_tol
                maximum difference for being considered "close", regardless of the
                magnitude of the input values

         Return True if a is close in value to b, and False otherwise.

         For the values to be considered close, the difference between them
         must be smaller than at least one of the tolerances.

         -inf, inf and NaN behave similarly to the IEEE 754 Standard.  That
         is, NaN is not close to anything, even itself.  inf and -inf are
         only close to themselves.

     isfinite(...)
         isfinite(x) -> bool

         Return True if x is neither an infinity nor a NaN, and False otherwise.

     isinf(...)
         isinf(x) -> bool

         Return True if x is a positive or negative infinity, and False otherwise.

     isnan(...)
         isnan(x) -> bool

         Return True if x is a NaN (not a number), and False otherwise.

     ldexp(...)
         ldexp(x, i)

         Return x * (2**i).

     lgamma(...)
         lgamma(x)

         Natural logarithm of absolute value of Gamma function at x.

     log(...)
         log(x[, base])

         Return the logarithm of x to the given base.
         If the base not specified, returns the natural logarithm (base e) of x.

     log10(...)
         log10(x)

         Return the base 10 logarithm of x.

     log1p(...)
         log1p(x)

         Return the natural logarithm of 1+x (base e).
         The result is computed in a way which is accurate for x near zero.

     log2(...)
         log2(x)

         Return the base 2 logarithm of x.

     modf(...)
         modf(x)

         Return the fractional and integer parts of x.  Both results carry the sign
         of x and are floats.

     pow(...)
         pow(x, y)

         Return x**y (x to the power of y).

     radians(...)
         radians(x)

         Convert angle x from degrees to radians.

     sin(...)
         sin(x)

         Return the sine of x (measured in radians).

     sinh(...)
         sinh(x)

         Return the hyperbolic sine of x.

     sqrt(...)
         sqrt(x)

         Return the square root of x.

     tan(...)
         tan(x)

         Return the tangent of x (measured in radians).

     tanh(...)
         tanh(x)

         Return the hyperbolic tangent of x.

     trunc(...)
         trunc(x:Real) -> Integral

         Truncates x to the nearest Integral toward 0. Uses the __trunc__ magic method.
 DATA
     e = 2.718281828459045
     inf = inf
     nan = nan
     pi = 3.141592653589793
     tau = 6.283185307179586
 FILE
     (built-in)