python error name not defined [closed]

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I am following https://www.analyticsvidhya.com/blog/2014/12/image-processing-python-basics/ to practice image processing.

I am writing the code in an incremental way and checking if everything goes well. So far I have written the following code

from matplotlib import pyplot as plt
from skimage import data
from skimage.feature import blob_dog, blob_log, blob_doh
from math import sqrt
from skimage.color import rgb2gray
import glob
from skimage.io import imread

example_file=glob.glob(r"/home/snowbell/sample.jpg")[0]
im=imread(example_file, as_grey=True)
plt.imshow(im, cmap=cm.gray)
plt.show()

The image location and the image name is only thing I have changed. I am getting the following error:-

Traceback (most recent call last):
  File "test.py", line 11, in <module>
    plt.imshow(im, cmap=cm.gray)
NameError: name 'cm' is not defined

Just a note : this looks more like a programming question rather than something Unix-related. PS: A simple google search after your NameError would yield lots of helpful results. — schaiba
– schaiba, Commented Jan 12, 2017 at 11:11
What did you expect cm.gray to produce? You never defined the name cm nor did you import it. — Martijn Pieters
– Martijn Pieters, Commented Jan 12, 2017 at 13:26
Does this answer your question? python name error name not defined — user4933
– user4933, Commented May 20, 2021 at 0:29

schaiba · Accepted Answer · 2017-01-12 11:10:41Z

10

from matplotlib import cm should work. Or import matplotlib.cm as cm

answered Jan 12, 2017 at 11:10

schaiba

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