Pandas 奇技淫巧

1 随机采样 df.sample

df.sample(frac=0.06) # 随机取样（分数 四舍五入）
df.sample(frac=0.05) # 109*0.05=5.45 109*0.06=6.54

frac : float, optional
Fraction of axis items to return. Cannot be used with n.

df.sample(n=5) # 5行

n : int, optional
Number of items from axis to return. Cannot be used with frac.
Default = 1 if frac = None.