Python 使用matplotlib示例时Django中出错
我正在测试几个Django和matplotlib的案例,比如or 每次,它在我的mac电脑上工作,但在我的服务器上不工作,我收到以下错误:Python 使用matplotlib示例时Django中出错,python,django,matplotlib,Python,Django,Matplotlib,我正在测试几个Django和matplotlib的案例,比如or 每次,它在我的mac电脑上工作,但在我的服务器上不工作,我收到以下错误: 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 inn
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
下面是一个小片段:
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
我曾尝试更新matplotlib、django等,但没有任何效果…目前,matplotlib的写入函数在文件中使用响应。您可以写入缓冲区,如下所示:
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
您可以用缓冲区替换响应,然后将缓冲区添加到响应中。这将为canvas.print_png()提供一个适当的对象,并将代码更改保持在最低限度
def mplimage(request):
f = matplotlib.figure.Figure()
buf = io.BytesIO()
canvas = FigureCanvasAgg(f)
canvas.print_png(buf)
response=HttpResponse(buf.getvalue(),content_type='image/png')
# if required clear the figure for reuse
f.clear()
# I recommend to add Content-Length for Django
response['Content-Length'] = str(len(response.content))
#
return response
使用
print_jpg
和“image/jpg”作为内容类型,它应该可以正常工作。