繼我以前的答案Inexplicable behavior when using vlen with h5py
我跑這個測試(h5py
版本 '2.2.1'):
In [4]: import h5py
In [5]: dt = h5py.special_dtype(vlen=str)
In [6]: f=h5py.File('foo.hdf5')
In [8]: ds1 = f.create_dataset('JustStrings',(10,), dtype=dt)
In [10]: ds1[0]='string'
In [11]: ds1[1]='a longer string'
In [13]: ds1[2:5]='one_string two_strings three'.split()
In [14]: ds1
Out[14]: <HDF5 dataset "JustStrings": shape (10,), type "|O4">
In [15]: ds1.value
Out[15]:
array(['string', 'a longer string', 'one_string', 'two_strings', 'three',
'', '', '', '', ''], dtype=object)
而對於混合D型像你這樣的:
In [16]: ds2 = f.create_dataset('IntandStrings',(10,),
dtype=np.dtype([("number",int),('astring',dt)]))
In [17]: ds2[0]=(1,'astring')
In [18]: ds2[1]=(10,'a longer string')
In [19]: ds2[2:4]=[(10,'a longer much string'),(0,'')]
In [20]: ds2.value
Out[20]:
array([(1, 'astring'), (10, 'a longer string'),
(10, 'a longer much string'), (0, ''), (0, ''), (0, ''), (0, ''),
(0, ''), (0, ''), (0, '')],
dtype=[('number', '<i4'), ('astring', 'O')])
試圖設置一個字段本身似乎並不工作
ds2['astring'][4]='one two three four'
相反,我必須設置全程記錄:
ds2[4]=(123,'one two three four')
嘗試設置整場產生了同樣的錯誤:
ds2['astring']='astring'
我草簽該數據集(10,)
,而你是(1,)
。但我認爲這是同樣的問題。
我可以,不過,集全數字字段:
In [48]: ds2['number']=np.arange(10)
In [50]: ds2['number']
Out[50]: array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
In [51]: ds2.value
Out[51]:
array([(0, 'astring'), (1, 'a longer string'),
(2, 'a longer much string'),
(3, ''), (4, 'one two three four'), (5, ''),
(6, ''), (7, ''),
(8, ''), (9, '')],
dtype=[('number', '<i4'), ('astring', 'O')])
感謝jpaulj!我非常親密,但卻在圈子裏。謝謝你非常全面的答案。 – EnemyBagJones