Question

我正在尝试使用python读取avro文件。

我成功安装了Apache Avro（我想我之所以这样做是因为我能够按照此处的说明在＃python shell中导入avro＆＃34;

https://avro.apache.org/docs/1.8.1/gettingstartedpython.html

然而，当我尝试按照上述指令中的代码读取avro文件时。导入avro相关内容时，我一直收到错误。

>>> import avro.schema
Traceback (most recent call last):
File "<pyshell#6>", line 1, in <module>
import avro.schema
File "<frozen importlib._bootstrap>", line 969, in _find_and_load
File "<frozen importlib._bootstrap>", line 954, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 896, in _find_spec
File "<frozen importlib._bootstrap_external>", line 1139, in find_spec
File "<frozen importlib._bootstrap_external>", line 1115, in _get_spec
File "<frozen importlib._bootstrap_external>", line 1096, in _legacy_get_spec
File "<frozen importlib._bootstrap>", line 444, in spec_from_loader
File "<frozen importlib._bootstrap_external>", line 533, in spec_from_file_location
File "I:\Program Files\lib\site-packages\avro-_avro_version_-py3.5.egg\avro\schema.py", line 340
except Exception, e:
                ^
SyntaxError: invalid syntax


>>> from avro.datafile import DataFileReader, DataFileWriter
Traceback (most recent call last):
File "I:\Program Files\lib\site-packages\avro-_avro_version_-py3.5.egg\avro\datafile.py", line 21, in <module>
from cStringIO import StringIO
ImportError: No module named 'cStringIO'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "<pyshell#7>", line 1, in <module>
from avro.datafile import DataFileReader, DataFileWriter
File "I:\Program Files\lib\site-packages\avro-_avro_version_-py3.5.egg\avro\datafile.py", line 23, in <module>
from StringIO import StringIO
ImportError: No module named 'StringIO'


>>> from avro.io import DatumReader, DatumWriter
Traceback (most recent call last):
File "<pyshell#19>", line 1, in <module>
from avro.io import DatumReader, DatumWriter
File "<frozen importlib._bootstrap>", line 969, in _find_and_load
File "<frozen importlib._bootstrap>", line 954, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 896, in _find_spec
File "<frozen importlib._bootstrap_external>", line 1139, in find_spec
File "<frozen importlib._bootstrap_external>", line 1115, in _get_spec
File "<frozen importlib._bootstrap_external>", line 1096, in _legacy_get_spec
File "<frozen importlib._bootstrap>", line 444, in spec_from_loader
File "<frozen importlib._bootstrap_external>", line 533, in spec_from_file_location
File "I:\Program Files\lib\site-packages\avro-_avro_version_-py3.5.egg\avro\io.py", line 200
bits = (((ord(self.read(1)) & 0xffL)) |
                                  ^
SyntaxError: invalid syntax

我是否成功安装了avro？我为什么收到这些错误？我在Windows 7上使用python 3.5.2。

被修改 我按照Stephane Martin的建议解决了这个问题。然后我尝试将avro文件读入python。我在一个目录中有一堆avros，它已经被设置为python中的正确路径。这是我的代码

import avro.schema
from avro.datafile import DataFileReader, DataFileWriter
from avro.io import DatumReader, DatumWriter

reader = DataFileReader(open("part-00000-of-01733.avro", "r"), DatumReader())
for user in reader:
   print (user)
reader.close()

并返回错误

Traceback (most recent call last):
File "I:\DJ data\read avro.py", line 5, in <module>
reader = DataFileReader(open("part-00000-of-01733.avro", "r"), DatumReader())
File "I:\Program Files\lib\site-packages\avro_python3-1.8.1-py3.5.egg\avro\datafile.py", line 349, in __init__
self._read_header()
File "I:\Program Files\lib\site-packages\avro_python3-1.8.1-py3.5.egg\avro\datafile.py", line 459, in _read_header
META_SCHEMA, META_SCHEMA, self.raw_decoder)
File "I:\Program Files\lib\site-packages\avro_python3-1.8.1-py3.5.egg\avro\io.py", line 525, in read_data
return self.read_record(writer_schema, reader_schema, decoder)
File "I:\Program Files\lib\site-packages\avro_python3-1.8.1-py3.5.egg\avro\io.py", line 725, in read_record
field_val = self.read_data(field.type, readers_field.type, decoder)
File "I:\Program Files\lib\site-packages\avro_python3-1.8.1-py3.5.egg\avro\io.py", line 515, in read_data
return self.read_fixed(writer_schema, reader_schema, decoder)
File "I:\Program Files\lib\site-packages\avro_python3-1.8.1-py3.5.egg\avro\io.py", line 568, in read_fixed
return decoder.read(writer_schema.size)
File "I:\Program Files\lib\site-packages\avro_python3-1.8.1-py3.5.egg\avro\io.py", line 170, in read
input_bytes = self.reader.read(n)
File "I:\Program Files\lib\encodings\cp1252.py", line 23, in decode
return codecs.charmap_decode(input,self.errors,decoding_table)[0]

UnicodeDecodeError：＆＃39; charmap＆＃39;编解码器不能解码位置863中的字节0x90：字符映射到

我确实知道在指令的示例中，首先创建了一个模式。但什么是avsc文件？在我的情况下，我该如何创建它和相应的模式？

Answer 1

通过pip或类似的软件包管理器进行安装时：安装avro-python3软件包而不仅仅是avro。

Answer 2

使用python 3的avro发行版，而不是python 2的发行版。

http://apache.mediamirrors.org/avro/avro-1.8.2/py3/

请注意，如果删除avro-1.8.2，则上述链接可能无效。

如何在python 3.5.2中读取avro文件

2 个答案: