Python——built-in module Help: math

  1 Help on built-in module math:
  2 NAME
  3     math
  4 DESCRIPTION
  5     This module is always available.  It provides access to the
  6     mathematical functions defined by the C standard.
  7 FUNCTIONS
  8     acos(...)
  9         acos(x)
 10         
 11         Return the arc cosine (measured in radians) of x.
 12     
 13     acosh(...)
 14         acosh(x)
 15         
 16         Return the inverse hyperbolic cosine of x.
 17     
 18     asin(...)
 19         asin(x)
 20         
 21         Return the arc sine (measured in radians) of x.
 22     
 23     asinh(...)
 24         asinh(x)
 25         
 26         Return the inverse hyperbolic sine of x.
 27     
 28     atan(...)
 29         atan(x)
 30         
 31         Return the arc tangent (measured in radians) of x.
 32     
 33     atan2(...)
 34         atan2(y, x)
 35         
 36         Return the arc tangent (measured in radians) of y/x.
 37         Unlike atan(y/x), the signs of both x and y are considered.
 38     
 39     atanh(...)
 40         atanh(x)
 41         
 42         Return the inverse hyperbolic tangent of x.
 43     
 44     ceil(...)
 45         ceil(x)
 46         
 47         Return the ceiling of x as an Integral.
 48         This is the smallest integer >= x.
 49     
 50     copysign(...)
 51         copysign(x, y)
 52         
 53         Return a float with the magnitude (absolute value) of x but the sign
 54         of y. On platforms that support signed zeros, copysign(1.0, -0.0)
 55         returns -1.0.
 56     
 57     cos(...)
 58         cos(x)
 59         
 60         Return the cosine of x (measured in radians).
 61     
 62     cosh(...)
 63         cosh(x)
 64         
 65         Return the hyperbolic cosine of x.
 66     
 67     degrees(...)
 68         degrees(x)
 69         
 70         Convert angle x from radians to degrees.
 71     
 72     erf(...)
 73         erf(x)
 74         
 75         Error function at x.
 76     
 77     erfc(...)
 78         erfc(x)
 79         
 80         Complementary error function at x.
 81     
 82     exp(...)
 83         exp(x)
 84         
 85         Return e raised to the power of x.
 86     
 87     expm1(...)
 88         expm1(x)
 89         
 90         Return exp(x)-1.
 91         This function avoids the loss of precision involved in the direct evaluation of exp(x)-1 for small x.
 92     
 93     fabs(...)
 94         fabs(x)
 95         
 96         Return the absolute value of the float x.
 97     
 98     factorial(...)
 99         factorial(x) -> Integral
100         
101         Find x!. Raise a ValueError if x is negative or non-integral.
102     
103     floor(...)
104         floor(x)
105         
106         Return the floor of x as an Integral.
107         This is the largest integer <= x.
108     
109     fmod(...)
110         fmod(x, y)
111         
112         Return fmod(x, y), according to platform C.  x % y may differ.
113     
114     frexp(...)
115         frexp(x)
116         
117         Return the mantissa and exponent of x, as pair (m, e).
118         m is a float and e is an int, such that x = m * 2.**e.
119         If x is 0, m and e are both 0.  Else 0.5 <= abs(m) < 1.0.
120     
121     fsum(...)
122         fsum(iterable)
123         
124         Return an accurate floating point sum of values in the iterable.
125         Assumes IEEE-754 floating point arithmetic.
126     
127     gamma(...)
128         gamma(x)
129         
130         Gamma function at x.
131     
132     gcd(...)
133         gcd(x, y) -> int
134         greatest common divisor of x and y
135     
136     hypot(...)
137         hypot(x, y)
138         
139         Return the Euclidean distance, sqrt(x*x + y*y).
140     
141     isclose(...)
142         isclose(a, b, *, rel_tol=1e-09, abs_tol=0.0) -> bool
143         
144         Determine whether two floating point numbers are close in value.
145         
146            rel_tol
147                maximum difference for being considered "close", relative to the
148                magnitude of the input values
149             abs_tol
150                maximum difference for being considered "close", regardless of the
151                magnitude of the input values
152         
153         Return True if a is close in value to b, and False otherwise.
154         
155         For the values to be considered close, the difference between them
156         must be smaller than at least one of the tolerances.
157         
158         -inf, inf and NaN behave similarly to the IEEE 754 Standard.  That
159         is, NaN is not close to anything, even itself.  inf and -inf are
160         only close to themselves.
161     
162     isfinite(...)
163         isfinite(x) -> bool
164         
165         Return True if x is neither an infinity nor a NaN, and False otherwise.
166     
167     isinf(...)
168         isinf(x) -> bool
169         
170         Return True if x is a positive or negative infinity, and False otherwise.
171     
172     isnan(...)
173         isnan(x) -> bool
174         
175         Return True if x is a NaN (not a number), and False otherwise.
176     
177     ldexp(...)
178         ldexp(x, i)
179         
180         Return x * (2**i).
181     
182     lgamma(...)
183         lgamma(x)
184         
185         Natural logarithm of absolute value of Gamma function at x.
186     
187     log(...)
188         log(x[, base])
189         
190         Return the logarithm of x to the given base.
191         If the base not specified, returns the natural logarithm (base e) of x.
192     
193     log10(...)
194         log10(x)
195         
196         Return the base 10 logarithm of x.
197     
198     log1p(...)
199         log1p(x)
200         
201         Return the natural logarithm of 1+x (base e).
202         The result is computed in a way which is accurate for x near zero.
203     
204     log2(...)
205         log2(x)
206         
207         Return the base 2 logarithm of x.
208     
209     modf(...)
210         modf(x)
211         
212         Return the fractional and integer parts of x.  Both results carry the sign
213         of x and are floats.
214     
215     pow(...)
216         pow(x, y)
217         
218         Return x**y (x to the power of y).
219     
220     radians(...)
221         radians(x)
222         
223         Convert angle x from degrees to radians.
224     
225     sin(...)
226         sin(x)
227         
228         Return the sine of x (measured in radians).
229     
230     sinh(...)
231         sinh(x)
232         
233         Return the hyperbolic sine of x.
234     
235     sqrt(...)
236         sqrt(x)
237         
238         Return the square root of x.
239     
240     tan(...)
241         tan(x)
242         
243         Return the tangent of x (measured in radians).
244     
245     tanh(...)
246         tanh(x)
247         
248         Return the hyperbolic tangent of x.
249     
250     trunc(...)
251         trunc(x:Real) -> Integral
252         
253         Truncates x to the nearest Integral toward 0. Uses the __trunc__ magic method.
254 DATA
255     e = 2.718281828459045
256     inf = inf
257     nan = nan
258     pi = 3.141592653589793
259     tau = 6.283185307179586
260 FILE
261     (built-in)