直接看例子:
>>> data = pd.Series(np.arange(10), index=[49,48,47,46,45, 1, 2, 3, 4, 5])
>>> data
49 0
48 1
47 2
46 3
45 4
1 5
2 6
3 7
4 8
5 9
dtype: int64
>>> data.iloc[:3]
49 0
48 1
47 2
dtype: int64
>>> data.loc[:3]
49 0
48 1
47 2
46 3
45 4
1 5
2 6
3 7
dtype: int64
>>> data.ix[:3]
49 0
48 1
47 2
46 3
45 4
1 5
2 6
3 7
dtype: int64
>>> data.iloc[:6]
49 0
48 1
47 2
46 3
45 4
1 5
dtype: int64
>>> data.loc[:6]
KeyError: 6
>>> data.ix[:6] #因为index里面不包含标签6,index都是整数
KeyError: 6
>>> data= pd.Series(np.arange(10), index=['a','b','c','d','e', 1, 2, 3, 4, 5])
>>> data
a 0
b 1
c 2
d 3
e 4
1 5
2 6
3 7
4 8
5 9
dtype: int64
>>> data.ix[:6]
a 0
b 1
c 2
d 3
e 4
1 5
dtype: int64
>>> data.loc[:6]
TypeError: cannot do slice indexing