使用matplotlib示例时Django中的错误 [英] Error in Django when using matplotlib examples
本文介绍了使用matplotlib示例时Django中的错误的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在测试Django和matplotlib的几种情况,例如法语.
I am testing several cases of Django and matplotlib such as this question or in french.
每次,它都可以在Mac上运行,但不能在服务器上接收以下错误:
Each time, it works on my mac, but does not on my server, where I receive the following error:
Internal Server Error: /mj/charts/mplimage.png
Traceback (most recent call last):
File "/usr/local/lib/python3.6/dist-packages/django/core/handlers/exception.py", line 35, in inner
response = get_response(request)
File "/usr/local/lib/python3.6/dist-packages/django/core/handlers/base.py", line 128, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/usr/local/lib/python3.6/dist-packages/django/core/handlers/base.py", line 126, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/root/src/jm/majority_judgment/views.py", line 39, in mplimage
canvas.print_png(response)
File "/usr/local/lib/python3.6/dist-packages/matplotlib/backends/backend_agg.py", line 526, in print_png
with cbook.open_file_cm(filename_or_obj, "wb") as fh:
File "/usr/lib/python3.6/contextlib.py", line 81, in __enter__
return next(self.gen)
File "/usr/local/lib/python3.6/dist-packages/matplotlib/cbook/__init__.py", line 624, in open_file_cm
fh, opened = to_filehandle(path_or_file, mode, True, encoding)
File "/usr/local/lib/python3.6/dist-packages/matplotlib/cbook/__init__.py", line 615, in to_filehandle
raise ValueError('fname must be a PathLike or file handle')
ValueError: fname must be a PathLike or file handle
[28/Mar/2018 19:09:11] "GET /mj/charts/mplimage.png HTTP/1.1" 500 82804
这是一个最小的代码段:
Here is a minimal snippet:
def mplimage(request):
f = matplotlib.figure.Figure()
canvas = FigureCanvasAgg(f)
response = HttpResponse(content_type='image/png')
canvas.print_png(response)
plt.close(f)
return response
我试图更新matplotlib,django等,但是什么也没做...
I have tried to update matplotlib, django and so on, but it did nothing...
推荐答案
At the moment, matplotlib's writing functions require the seek
ducktype to use the response at a file. You can write to a buffer, like this:
import io
def mplimage(request):
f = matplotlib.figure.Figure()
# Code that sets up figure goes here; in the question, that's ...
FigureCanvasAgg(f)
buf = io.BytesIO()
plt.savefig(buf, format='png')
plt.close(f)
response = HttpResponse(buf.getvalue(), content_type='image/png')
return response
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