df.sample（）随机取样

pandas学习之df.sample

df.sample()用于从dataframe或者series中，随机取样。sample 美['sæmp(ə)l] v采样；取样；n样品

DataFrame.sample(self: ~ FrameOrSeries, n=None, frac=None, replace=False, weights=None, random_state=None, axis=None)