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MNT: make certifi actually optional#18670

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Merged
QuLogic merged 1 commit intomatplotlib:masterfromtacaswell:optional_cerifi
Oct 6, 2020
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13 changes: 11 additions & 2 deletionslib/matplotlib/__init__.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -717,7 +717,11 @@ def is_url(filename):

@functools.lru_cache()
def _get_ssl_context():
import certifi
try:
import certifi
except ImportError:
_log.debug("Could not import certifi.")
return None
import ssl
return ssl.create_default_context(cafile=certifi.where())

Expand All@@ -726,7 +730,12 @@ def _get_ssl_context():
def _open_file_or_url(fname):
if not isinstance(fname, Path) and is_url(fname):
import urllib.request
with urllib.request.urlopen(fname, context=_get_ssl_context()) as f:
ssl_ctx = _get_ssl_context()
if ssl_ctx is None:
_log.debug(
"Could not get certifi ssl context, https may not work."
)
with urllib.request.urlopen(fname, context=ssl_ctx) as f:
yield (line.decode('utf-8') for line in f)
else:
fname = os.path.expanduser(fname)
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8 changes: 6 additions & 2 deletionslib/matplotlib/image.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -1478,8 +1478,12 @@ def imread(fname, format=None):
if len(parsed.scheme) > 1: # Pillow doesn't handle URLs directly.
# hide imports to speed initial import on systems with slow linkers
from urllib import request
with request.urlopen(fname,
context=mpl._get_ssl_context()) as response:
ssl_ctx = mpl._get_ssl_context()
if ssl_ctx is None:
_log.debug(
"Could not get certifi ssl context, https may not work."
)
with request.urlopen(fname, context=ssl_ctx) as response:
import io
try:
response.seek(0)
Expand Down
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