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Bug summary
After installing matplotlib 2.1.1 via pip (using source package , .tar.gz) it fails to run due to incompatibility with numpy API.
Code for reproduction
I've used docker on debian 8 to test it with default python (2.7) and default pip (1.5):
→ docker run --rm -it debian:8 bash
root@49c12ed51a55:/# apt-get update -qq
root@49c12ed51a55:/# apt-get install python-pip libpng12-dev libfreetype6-dev pkg-config
(...)
root@49c12ed51a55:/# pip install matplotlib 1>stdout.log 2>stderr.log
root@49c12ed51a55:/# python -c "import matplotlib.artist as martist"
RuntimeError: module compiled against API version 0xc but this version of numpy is 0xb
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/local/lib/python2.7/dist-packages/matplotlib/artist.py", line 16, in <module>
from .path import Path
File "/usr/local/lib/python2.7/dist-packages/matplotlib/path.py", line 25, in <module>
from . import _path, rcParams
ImportError: numpy.core.multiarray failed to import
root@49c12ed51a55:/# python -V
Python 2.7.9
root@49c12ed51a55:/# python -c "import matplotlib; print(matplotlib.get_backend())"
agg
root@49c12ed51a55:/# cat stdout.log | grep NPY_API_VERSION
#define NPY_API_VERSION 0x0000000C
#define NPY_API_VERSION 0x0000000B
Matplotlib version
- Operating system: Linux, debian 8 (in docker)
- Matplotlib version: 2.1.1
- Matplotlib backend (
print(matplotlib.get_backend())): agg - Python version: 2.7.9
- Other libraries: docker, debian 8
The problem was triggered by some other package with which I had trouble to produce wheels. See discussion here: pytrip/pytrip#419 (comment)
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