Deprecate imread() reading from URLs by anntzer · Pull Request #19367 · matplotlib/matplotlib · GitHub
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Deprecate imread() reading from URLs #19367

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Merged
timhoffm merged 2 commits into from
Jan 28, 2021
Merged

Deprecate imread() reading from URLs #19367

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1e12cad
Deprecate imread() reading from URLs
timhoffm Oct 3, 2020
9302392
Document use of Pillow as alternative.
anntzer Jan 26, 2021
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7 changes: 7 additions & 0 deletions doc/api/next_api_changes/deprecations/18649-TH.rst
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10 changes: 9 additions & 1 deletion lib/matplotlib/image.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1430,6 +1430,10 @@ def imread(fname, format=None):
fname : str or file-like
The image file to read: a filename, a URL or a file-like object opened
in read-binary mode.

Passing a URL is deprecated. Please open the URL
for reading and pass the result to Pillow, e.g. with
``PIL.Image.open(urllib.request.urlopen(url))``.
format : str, optional
The image file format assumed for reading the data. If not
given, the format is deduced from the filename. If nothing can
Expand Down Expand Up @@ -1472,9 +1476,13 @@ def imread(fname, format=None):
img_open = (
PIL.PngImagePlugin.PngImageFile if ext == 'png' else PIL.Image.open)
if isinstance(fname, str):

parsed = parse.urlparse(fname)
if len(parsed.scheme) > 1: # Pillow doesn't handle URLs directly.
cbook.warn_deprecated(
"3.4", message="Directly reading images from URLs is "
"deprecated. Please open the URL for reading and pass the "
"result to Pillow, e.g. with "
"``PIL.Image.open(urllib.request.urlopen(url))``.")
# hide imports to speed initial import on systems with slow linkers
from urllib import request
ssl_ctx = mpl._get_ssl_context()
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8 changes: 5 additions & 3 deletions lib/matplotlib/tests/test_image.py
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