遍历 Pandas 系列时出错

Question

当我获取这个系列的第一个和第二个元素时，它工作正常，但是从元素 3 开始，当我尝试获取时出现错误。

type(X_test_raw)
Out[51]: pandas.core.series.Series

len(X_test_raw)
Out[52]: 1393

X_test_raw[0]
Out[45]: 'Go until jurong point, crazy.. Available only in bugis n great world la e buffet... Cine there got amore wat...'

X_test_raw[1]
Out[46]: 'Ok lar... Joking wif u oni...'

X_test_raw[2]

KeyError: 2

Answer 1

没有值为 2 的索引。

样本：

X_test_raw = pd.Series([4,8,9], index=[0,4,5])

print (X_test_raw)
0    4
4    8
5    9
dtype: int64

#print (X_test_raw[2])
#KeyError: 2

如果需要第三个值使用iloc:

print (X_test_raw.iloc[2])
9

如果只需要迭代值：

for x in X_test_raw:
    print (x)
4
8
9

如果需要 indexes 和 values 使用 Series.iteritems:

for idx, x in X_test_raw.iteritems():
    print (idx, x)
0 4
4 8
5 9

Answer 2

考虑系列X_test_raw

X_test_raw = pd.Series(
    ['Go until jurong point, crazy.. Available only in bugis n great world la e buffet... Cine there got amore wat...',
     'Ok lar... Joking wif u oni...',
     'PLEASE DON\'T FAIL'
    ], [0, 1, 3])

X_test_raw 没有您试图用 X_test_raw[2].

引用的 2 的索引

改为使用iloc

X_test_raw.iloc[2]

"PLEASE DON'T FAIL"

您可以使用 iteritems

遍历系列

for index_val, series_val in X_test_raw.iteritems():
    print series_val

Go until jurong point, crazy.. Available only in bugis n great world la e buffet... Cine there got amore wat...
Ok lar... Joking wif u oni...
PLEASE DON'T FAIL

遍历 Pandas 系列时出错

Error iterating through a Pandas series

python

indexing

for-loop

pandas

keyerror