我有一个数组:
>>> data = np.ones((1,3,128))
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我使用savez_compressed
将其保存到文件中:
>>> with open('afile','w') as f:
np.savez_compressed(f,data=data)
型
当我尝试加载它时,我似乎无法访问数据:
>>> with open('afile','r') as f:
b=np.load(f)
>>> b.files
['data']
>>> b['data']
Traceback (most recent call last):
File "<pyshell#196>", line 1, in <module>
b['data']
File "C:\Python27\lib\site-packages\numpy\lib\npyio.py", line 238, in __getitem__
bytes = self.zip.read(key)
File "C:\Python27\lib\zipfile.py", line 828, in read
return self.open(name, "r", pwd).read()
File "C:\Python27\lib\zipfile.py", line 853, in open
zef_file.seek(zinfo.header_offset, 0)
ValueError: I/O operation on closed file
型
我做错什么了吗?
编辑
在@Saullo Castro的回答之后,我试着这样做:
>>> np.savez_compressed('afile.npz',data=data)
>>> b=np.load('afile.npz')
>>> b.files
['data']
>>> b['data']
型
并得到以下错误:
Traceback (most recent call last):
File "<pyshell#253>", line 1, in <module>
b['data']
File "C:\Python27\lib\site-packages\numpy\lib\npyio.py", line 241, in __getitem__
return format.read_array(value)
File "C:\Python27\lib\site-packages\numpy\lib\format.py", line 440, in read_array
shape, fortran_order, dtype = read_array_header_1_0(fp)
File "C:\Python27\lib\site-packages\numpy\lib\format.py", line 336, in read_array_header_1_0
d = safe_eval(header)
File "C:\Python27\lib\site-packages\numpy\lib\utils.py", line 1156, in safe_eval
ast = compiler.parse(source, mode="eval")
File "C:\Python27\lib\compiler\transformer.py", line 53, in parse
return Transformer().parseexpr(buf)
File "C:\Python27\lib\compiler\transformer.py", line 132, in parseexpr
return self.transform(parser.expr(text))
File "C:\Python27\lib\compiler\transformer.py", line 124, in transform
return self.compile_node(tree)
File "C:\Python27\lib\compiler\transformer.py", line 159, in compile_node
return self.eval_input(node[1:])
File "C:\Python27\lib\compiler\transformer.py", line 194, in eval_input
return Expression(self.com_node(nodelist[0]))
File "C:\Python27\lib\compiler\transformer.py", line 805, in com_node
return self._dispatch[node[0]](node[1:])
File "C:\Python27\lib\compiler\transformer.py", line 578, in testlist
return self.com_binary(Tuple, nodelist)
File "C:\Python27\lib\compiler\transformer.py", line 1082, in com_binary
return self.lookup_node(n)(n[1:])
File "C:\Python27\lib\compiler\transformer.py", line 596, in test
then = self.com_node(nodelist[0])
File "C:\Python27\lib\compiler\transformer.py", line 805, in com_node
return self._dispatch[node[0]](node[1:])
File "C:\Python27\lib\compiler\transformer.py", line 610, in or_test
return self.com_binary(Or, nodelist)
File "C:\Python27\lib\compiler\transformer.py", line 1082, in com_binary
return self.lookup_node(n)(n[1:])
File "C:\Python27\lib\compiler\transformer.py", line 615, in and_test
return self.com_binary(And, nodelist)
File "C:\Python27\lib\compiler\transformer.py", line 1082, in com_binary
return self.lookup_node(n)(n[1:])
File "C:\Python27\lib\compiler\transformer.py", line 619, in not_test
result = self.com_node(nodelist[-1])
File "C:\Python27\lib\compiler\transformer.py", line 805, in com_node
return self._dispatch[node[0]](node[1:])
File "C:\Python27\lib\compiler\transformer.py", line 626, in comparison
node = self.com_node(nodelist[0])
File "C:\Python27\lib\compiler\transformer.py", line 805, in com_node
return self._dispatch[node[0]](node[1:])
File "C:\Python27\lib\compiler\transformer.py", line 659, in expr
return self.com_binary(Bitor, nodelist)
File "C:\Python27\lib\compiler\transformer.py", line 1082, in com_binary
return self.lookup_node(n)(n[1:])
File "C:\Python27\lib\compiler\transformer.py", line 663, in xor_expr
return self.com_binary(Bitxor, nodelist)
File "C:\Python27\lib\compiler\transformer.py", line 1082, in com_binary
return self.lookup_node(n)(n[1:])
File "C:\Python27\lib\compiler\transformer.py", line 667, in and_expr
return self.com_binary(Bitand, nodelist)
File "C:\Python27\lib\compiler\transformer.py", line 1082, in com_binary
return self.lookup_node(n)(n[1:])
File "C:\Python27\lib\compiler\transformer.py", line 671, in shift_expr
node = self.com_node(nodelist[0])
File "C:\Python27\lib\compiler\transformer.py", line 805, in com_node
return self._dispatch[node[0]](node[1:])
File "C:\Python27\lib\compiler\transformer.py", line 683, in arith_expr
node = self.com_node(nodelist[0])
File "C:\Python27\lib\compiler\transformer.py", line 805, in com_node
return self._dispatch[node[0]](node[1:])
File "C:\Python27\lib\compiler\transformer.py", line 695, in term
node = self.com_node(nodelist[0])
File "C:\Python27\lib\compiler\transformer.py", line 805, in com_node
return self._dispatch[node[0]](node[1:])
File "C:\Python27\lib\compiler\transformer.py", line 715, in factor
node = self.lookup_node(nodelist[-1])(nodelist[-1][1:])
File "C:\Python27\lib\compiler\transformer.py", line 727, in power
node = self.com_node(nodelist[0])
File "C:\Python27\lib\compiler\transformer.py", line 805, in com_node
return self._dispatch[node[0]](node[1:])
File "C:\Python27\lib\compiler\transformer.py", line 739, in atom
return self._atom_dispatch[nodelist[0][0]](nodelist)
File "C:\Python27\lib\compiler\transformer.py", line 754, in atom_lbrace
return self.com_dictorsetmaker(nodelist[1])
File "C:\Python27\lib\compiler\transformer.py", line 1214, in com_dictorsetmaker
assert nodelist[0] == symbol.dictorsetmaker
AssertionError
型
编辑2
上述错误发生在IDLE中。使用Ipython。
4条答案
按热度按时间q43xntqr1#
当使用
numpy.load
时,如果扩展名为.npz
,则会首先解压缩文件:字符串
并执行
b['array1']
等操作来检索每个数组中的数据...7fhtutme2#
您还可以使用
f
属性,这将为您留下np.ndarray
:字符串
. npz文件中的数组的名称/键(例如
arr_0
)可以通过型
f
属性没有记录在load的docstring中。当load读取npz
文件时,它返回class NpzFile
的示例。这个类可以作为numpy.lib.npyio.NpzFile
使用。NpzFile
类的文档字符串描述了f
属性。(在撰写本文时,类的源代码可以在这里找到。8wigbo563#
尝试以二进制方式打开文件:
字符串
yx2lnoni4#
在Mac OS和Windows上使用numpy 1.7.1/1.8.0和python 2.7.6时,我确实遇到了同样的问题(AssertionError)。但是这个问题在我用python 2.7.5切换到linux后自动修复了。然后我在MACOS和Windows上重新安装Python 2.7.5,所有问题都消失了。基本上问题是python而不是numpy,因为编译器正在发送alert.So版本可能很重要。
但是,尽管npy是numpy的可序列化类型,但我认为即使使用savez_compressed来处理大型矩阵,文件也不够小。
希望你的问题和我的一样