Image alt text when rendering IPython.display.Image is not displayed when Image() is created from filename or data elements. The test_image_alt_tag() only tests Image() objects created from url).
The following (included in tests) passes:
import nose.tools as nt
thisurl = "http://example.com/image.png"
img = Image(url=thisurl, alt="an image")
nt.assert_equal(u'<img src="%s" alt="an image"/>' % (thisurl), img._repr_html_())
The following two cases do render an image but fail to produce alt text (indeed, they don't seem to return __repr_html__()?
from numpy import random
import matplotlib.pyplot as plt
x = random.randint(10, size=(10))
y = random.randint(10, size=(10))
plt.scatter(x, y)
img_fn = 'example.png'
plt.savefig(img_fn)
img2 = Image(filename=img_fn, alt="another image")
# _repr_html_() returns None
assert img2._repr_html_() == None
nt.assert_equal(u'<img src="%s" alt="another image"/>' % (img_fn), img2._repr_html_())
"""
AssertionError: '<img src="example.png" alt="another image"/>' != None
"""
and:
with open(img_fn, "rb") as image:
img_bytes = bytearray( image.read() )
img3 = Image(filename=img_fn, alt="another image")
repr_html = img3._repr_html_()
# _repr_html_() returns None
assert img3._repr_html_() == None
Image alt text when rendering
IPython.display.Imageis not displayed whenImage()is created fromfilenameordataelements. Thetest_image_alt_tag()only testsImage()objects created fromurl).The following (included in tests) passes:
The following two cases do render an image but fail to produce alt text (indeed, they don't seem to return
__repr_html__()?and: