numpy pandas 索引注意事项

pandas.DataFrame 的 iloc
 1 # ------------------------------------------------------------
 2 'python式的切片，包含为尾位置'
 3 In [23]:df = pd.DataFrame({
 4             'http_status': [200,200,404,404,301],
 5             'response_time': [0.04, 0.02, 0.07, 0.08, 1.0]},
 6             index=[0,1,2,3,4])
 7 
 8 In [26]:df[1:3]
 9 Out[26]: 
10    http_status  response_time
11 1          200           0.02
12 2          404           0.07
13 
14 In [24]:df.iloc[1:3,:]
15 Out[24]: 
16    http_status  response_time
17 1          200           0.02
18 2          404           0.07
19 
20 
21 In [28]:df.values[1:3,:]
22 Out[28]: 
23 array([[  2.00000000e+02,   2.00000000e-02],
24        [  4.04000000e+02,   7.00000000e-02]])
25 
26 # ------------------------------------------------------------
27 'matlab式的切片，包含尾位置'
28 In [29]:df.ix[1:3,:]
29 Out[29]: 
30    http_status  response_time
31 1          200           0.02
32 2          404           0.07
33 3          404           0.08