这种问题怎么解答(尽量用pandas解答)

Question

三个小问题分开解答，主要是第三个。原谅我刚学这东西看着太懵了。阿巴阿巴阿巴阿巴阿巴阿巴阿巴

Answer 1

#1
df.shape

#2
df.groupby(['xjh','xm']).count()['sm'].head(10)

#3
df['year']=df.jsrq.apply(lambda x:x[0:4])
df1=df.groupby(['year','xb'],as_index=0).count()['sm']
plt.plot(df[df.xb==1].year,df[df.xb==1].sm)
plt.plot(df[df.xb==0].year,df[df.xb==0].sm)
plt.show()