[
https://issues.apache.org/jira/browse/ARROW-8638?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Vibhatha Lakmal Abeykoon updated ARROW-8638:
--------------------------------------------
Description:
I am working on using both Arrow C++ API and Cython API to support an
application that I am developing. But here, I will add the issue I experienced
when I am trying to follow the example,
[https://arrow.apache.org/docs/python/extending.html]
I am testing on Ubuntu 20.04 LTS
Python version 3.8.2
These are the steps I followed.
# Create Virtualenv
python3 -m venv ENVARROW
2. Activate ENV
source ENVARROW/bin/activate
3. pip3 install pyarrow==0.16.0 cython numpy
4. Code block and Tools,
+*example.pyx*+
{code:java}
from pyarrow.lib cimport *
def get_array_length(obj):
# Just an example function accessing both the pyarrow Cython API
# and the Arrow C++ API
cdef shared_ptr[CArray] arr = pyarrow_unwrap_array(obj)
if arr.get() == NULL:
raise TypeError("not an array")
return arr.get().length()
def get_table_info(obj):
cdef shared_ptr[CTable] table = pyarrow_unwrap_table(obj)
if table.get() == NULL:
raise TypeError("not an table")
return table.get().num_columns()
{code}
+*setup.py*+
{code:java}
from distutils.core import setup
from Cython.Build import cythonize
import os
import numpy as np
import pyarrow as pa
ext_modules = cythonize("example.pyx")
for ext in ext_modules:
# The Numpy C headers are currently required
ext.include_dirs.append(np.get_include())
ext.include_dirs.append(pa.get_include())
ext.libraries.extend(pa.get_libraries())
ext.library_dirs.extend(pa.get_library_dirs())
if os.name == 'posix':
ext.extra_compile_args.append('-std=c++11')
# Try uncommenting the following line on Linux
# if you get weird linker errors or runtime crashes
#ext.define_macros.append(("_GLIBCXX_USE_CXX11_ABI", "0"))
setup(ext_modules=ext_modules)
{code}
+*arrow_array.py*+
{code:java}
import example
import pyarrow as pa
import numpy as np
arr = pa.array([1,2,3,4,5])
len = example.get_array_length(arr)
print("Array length {} ".format(len))
{code}
+*arrow_table.py*+
{code:java}
import example
import pyarrow as pa
import numpy as np
from pyarrow import csv
fn = 'data.csv'
table = csv.read_csv(fn)
print(table)
cols = example.get_table_info(table)
print(cols)
{code}
+*data.csv*+
{code:java}
1,2,3,4,5
6,7,8,9,10
11,12,13,14,15
{code}
+*Makefile*+
{code:java}
install:
python3 setup.py build_ext --inplace
clean:
rm -R *.so build *.cpp
{code}
**When I try to run either of the python example scripts arrow_table.py or
arrow_array.py,
I get the following error.
{code:java}
File "arrow_array.py", line 1, in <module>
import example
ImportError: libarrow.so.16: cannot open shared object file: No such file or
directory
{code}
*Note: I also checked this on RHEL7 with Python 3.6.8, I got a similar
response.*
was:
I am working on using both Arrow C++ API and Cython API to support an
application that I am developing. But here, I will add the issue I experienced
when I am trying to follow the example,
[https://arrow.apache.org/docs/python/extending.html]
I am testing on Ubuntu 20.04 LTS
Python version 3.8.2
These are the steps I followed.
# Create Virtualenv
python3 -m venv ENVARROW
2. Activate ENV
source ENVARROW/bin/activate
3. pip3 install pyarrow==0.16.0 cython numpy
4. Code block and Tools,
+*example.pyx*+
{code:java}
from pyarrow.lib cimport *
def get_array_length(obj):
# Just an example function accessing both the pyarrow Cython API
# and the Arrow C++ API
cdef shared_ptr[CArray] arr = pyarrow_unwrap_array(obj)
if arr.get() == NULL:
raise TypeError("not an array")
return arr.get().length()
def get_table_info(obj):
cdef shared_ptr[CTable] table = pyarrow_unwrap_table(obj)
if table.get() == NULL:
raise TypeError("not an table")
return table.get().num_columns()
{code}
+*setup.py*+
{code:java}
from distutils.core import setup
from Cython.Build import cythonize
import os
import numpy as np
import pyarrow as pa
ext_modules = cythonize("example.pyx")
for ext in ext_modules:
# The Numpy C headers are currently required
ext.include_dirs.append(np.get_include())
ext.include_dirs.append(pa.get_include())
ext.libraries.extend(pa.get_libraries())
ext.library_dirs.extend(pa.get_library_dirs())
if os.name == 'posix':
ext.extra_compile_args.append('-std=c++11')
# Try uncommenting the following line on Linux
# if you get weird linker errors or runtime crashes
#ext.define_macros.append(("_GLIBCXX_USE_CXX11_ABI", "0"))
setup(ext_modules=ext_modules)
{code}
+*arrow_array.py*+
{code:java}
import example
import pyarrow as pa
import numpy as np
arr = pa.array([1,2,3,4,5])
len = example.get_array_length(arr)
print("Array length {} ".format(len))
{code}
+*arrow_table.py*+
{code:java}
import example
import pyarrow as pa
import numpy as np
from pyarrow import csv
fn = 'data.csv'
table = csv.read_csv(fn)
print(table)
cols = example.get_table_info(table)
print(cols)
{code}
+*data.csv*+
{code:java}
1,2,3,4,5
6,7,8,9,10
11,12,13,14,15
{code}
**When I try to run either of the python example scripts arrow_table.py or
arrow_array.py,
I get the following error.
{code:java}
File "arrow_array.py", line 1, in <module>
import example
ImportError: libarrow.so.16: cannot open shared object file: No such file or
directory
{code}
*Note: I also checked this on RHEL7 with Python 3.6.8, I got a similar
response.*
+*Makefile*+
{code:java}
{code}
*install:*
*python3 setup.py build_ext --inplace*
*clean:*
*rm -R *.so build *.cpp***
> Arrow Cython API Usage Gives an error when calling CTable API Endpoints
> -----------------------------------------------------------------------
>
> Key: ARROW-8638
> URL: https://issues.apache.org/jira/browse/ARROW-8638
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++, Python
> Affects Versions: 0.16.0
> Environment: Ubuntu 20.04 with Python 3.8.2
> RHEL7 with Python 3.6.8
> Reporter: Vibhatha Lakmal Abeykoon
> Priority: Blocker
> Fix For: 0.16.0
>
>
> I am working on using both Arrow C++ API and Cython API to support an
> application that I am developing. But here, I will add the issue I
> experienced when I am trying to follow the example,
> [https://arrow.apache.org/docs/python/extending.html]
> I am testing on Ubuntu 20.04 LTS
> Python version 3.8.2
> These are the steps I followed.
> # Create Virtualenv
> python3 -m venv ENVARROW
>
> 2. Activate ENV
> source ENVARROW/bin/activate
>
> 3. pip3 install pyarrow==0.16.0 cython numpy
>
> 4. Code block and Tools,
>
> +*example.pyx*+
>
>
> {code:java}
> from pyarrow.lib cimport *
> def get_array_length(obj):
> # Just an example function accessing both the pyarrow Cython API
> # and the Arrow C++ API
> cdef shared_ptr[CArray] arr = pyarrow_unwrap_array(obj)
> if arr.get() == NULL:
> raise TypeError("not an array")
> return arr.get().length()
> def get_table_info(obj):
> cdef shared_ptr[CTable] table = pyarrow_unwrap_table(obj)
> if table.get() == NULL:
> raise TypeError("not an table")
>
> return table.get().num_columns()
> {code}
>
>
> +*setup.py*+
>
>
> {code:java}
> from distutils.core import setup
> from Cython.Build import cythonize
> import os
> import numpy as np
> import pyarrow as pa
> ext_modules = cythonize("example.pyx")
> for ext in ext_modules:
> # The Numpy C headers are currently required
> ext.include_dirs.append(np.get_include())
> ext.include_dirs.append(pa.get_include())
> ext.libraries.extend(pa.get_libraries())
> ext.library_dirs.extend(pa.get_library_dirs())
> if os.name == 'posix':
> ext.extra_compile_args.append('-std=c++11')
> # Try uncommenting the following line on Linux
> # if you get weird linker errors or runtime crashes
> #ext.define_macros.append(("_GLIBCXX_USE_CXX11_ABI", "0"))
> setup(ext_modules=ext_modules)
> {code}
>
>
> +*arrow_array.py*+
>
> {code:java}
> import example
> import pyarrow as pa
> import numpy as np
> arr = pa.array([1,2,3,4,5])
> len = example.get_array_length(arr)
> print("Array length {} ".format(len))
> {code}
>
> +*arrow_table.py*+
>
> {code:java}
> import example
> import pyarrow as pa
> import numpy as np
> from pyarrow import csv
> fn = 'data.csv'
> table = csv.read_csv(fn)
> print(table)
> cols = example.get_table_info(table)
> print(cols)
>
> {code}
> +*data.csv*+
> {code:java}
> 1,2,3,4,5
> 6,7,8,9,10
> 11,12,13,14,15
> {code}
>
> +*Makefile*+
>
> {code:java}
> install:
> python3 setup.py build_ext --inplace
> clean:
> rm -R *.so build *.cpp
> {code}
>
> **When I try to run either of the python example scripts arrow_table.py or
> arrow_array.py,
> I get the following error.
>
> {code:java}
> File "arrow_array.py", line 1, in <module>
> import example
> ImportError: libarrow.so.16: cannot open shared object file: No such file or
> directory
> {code}
>
>
> *Note: I also checked this on RHEL7 with Python 3.6.8, I got a similar
> response.*
>
>
>
>
>
>
>
>
>
>
>
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