python数据处理之如何选取csv文件中某几行的数据

import pandas as pd
df = pd.DataFrame({'a':[1,2,3,4,5,6,7,8,9],'b':[22,33,44,55,66,77,88,99,10]})
df.to_csv('test.csv')
dt = pd.read_csv('test.csv',skiprows=5,nrows=3)
 
print(dt)
 
 
out:
 4 5 66
0 5 6 77
1 6 7 88
2 7 8 99
3 8 9 10

df = pd.DataFrame({'BoolCol': [1, 2, 3, 3, 4],'attr': [22, 33, 22, 44, 66]},
  index=[10,20,30,40,50])
print(df)
a = df[(df.BoolCol==3)&(df.attr==22)].index.tolist()
print(a)
 
 
df = pd.DataFrame({'BoolCol': [1, 2, 3, 3, 4],'attr': [22, 33, 22, 44, 66]},
  index=[10,20,30,40,50])
print(df)
a = df[(df.BoolCol==3)&(df.attr==22)].index.tolist()
print(a)