scipy.stats.exponweib：scipy包中计算weibull分布的函数。
密度函数的格式：exponweib.pdf(x, a, c) = a * c * (1-exp(-xc))(a-1) * exp(-xc)*x(c-1)，这个形式很奇怪
在官方文档说a和c是shape parameter，扩展的loc和scale参数，exponweib.pdf(x, a, c， loc, scale) = exponweib.pdf(x-loc/scale, a,c)这个格式。
函数：
rvs(a, c, loc=0, scale=1, size=1, random_state=None)Random variates.，服从weibull分布的随机变量
pdf(x, a, c, loc=0, scale=1) Probability density function.概率密度函数
logpdf(x, a, c, loc=0, scale=1) Log of the probability density function.概率密度函数的对数形式
cdf(x, a, c, loc=0, scale=1) Cumulative density function.累积分布函数
logcdf(x, a, c, loc=0, scale=1) Log of the cumulative density function.累积分布函数的对数形式
sf(x, a, c, loc=0, scale=1) Survival function (also defined as 1 – cdf, but sf is sometimes more accurate).生存函数，1-cdf的形式
logsf(x, a, c, loc=0, scale=1) Log of the survival function.生存函数的对数形式
ppf(q, a, c, loc=0, scale=1) Percent point function (inverse of cdf — percentiles).累积分布函数的分位点
isf(q, a, c, loc=0, scale=1) Inverse survival function (inverse of sf).，逆函数
moment(n, a, c, loc=0, scale=1) Non-central moment of order n
stats(a, c, loc=0, scale=1, moments=’mv’) Mean(‘m’), variance(‘v’), skew(‘s’), and/or kurtosis(‘k’).分布的一些统计值
entropy(a, c, loc=0, scale=1) (Differential) entropy of the RV.熵
fit(data, a, c, loc=0, scale=1) Parameter estimates for generic data.参数估计
expect(func, args=(a, c), loc=0, scale=1, lb=None, ub=None, conditional=False, kwds)Expected value of a function (of one argument) with respect to the distribution.期望
median(a, c, loc=0, scale=1) Median of the distribution.中位值
mean(a, c, loc=0, scale=1) Mean of the distribution.平均值
var(a, c, loc=0, scale=1) Variance of the distribution.方差
std(a, c, loc=0, scale=1) Standard deviation of the distribution.标准差
interval(alpha, a, c, loc=0, scale=1) Endpoints of the range that contains alpha percent of the distribution，百分比的点估计
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