from __future__ import print_function
import matplotlib.pyplot as plt
import numpy as np
import matplotlib.cbook as cbook

w, h = 512, 512

datafile = cbook.get_sample_data('ct.raw.gz', asfileobj=True)
s = datafile.read()
A = np.fromstring(s, np.uint16).astype(float)
A *= 1.0 / max(A)
A.shape = w, h

extent = (0, 25, 0, 25)
im = plt.imshow(A, cmap=plt.cm.hot, origin='upper', extent=extent)

markers = [(15.9, 14.5), (16.8, 15)]
x, y = zip(*markers)
plt.plot(x, y, 'o')

plt.title('CT density')

plt.show() 

　

Traceback (most recent call last):
  File "M:\______\image_demo2.py", line 8, in 
    datafile = cbook.get_sample_data('ct.raw.gz', asfileobj=True)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\______\AppData\Local\Programs\Python\Python311\Lib
    \site-packages\matplotlib\cbook\__init__.py", line 530, in get_sample_data
    return gzip.open(path)
           ^^^^^^^^^^^^^^^
  File "C:\Users\______\AppData\Local\Programs\Python\Python311\Lib\gzip.py", 
    line 58, in open
    binary_file = GzipFile(filename, gz_mode, compresslevel)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\______\AppData\Local\Programs\Python\Python311\Lib\gzip.py", 
    line 174, in __init__
    fileobj = self.myfileobj = builtins.open(filename, mode or 'rb')
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: 
'C:\\Users\\kamif\\AppData\\Local\\Programs\\Python\\Python311\\Lib
              \\site-packages\\matplotlib\\mpl-data\\sample_data\\ct.raw.gz' 

Traceback (most recent call last):
  File "E:\______\image_demo2.py", line 8, in 
    datafile = cbook.get_sample_data('ct.raw.gz', asfileobj=True)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\_api\deprecation.py", 
    line 384, in wrapper
    return func(*inner_args, **inner_kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\cbook.py", 
    line 525, in get_sample_data
    return gzip.open(path)
           ^^^^^^^^^^^^^^^
  File "C:\Program Files\Python312\Lib\gzip.py", line 61, in open
    binary_file = GzipFile(filename, gz_mode, compresslevel)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python312\Lib\gzip.py", line 192, in __init__
    fileobj = self.myfileobj = builtins.open(filename, mode or 'rb')
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: 
'C:\\Program Files\\Python312\\Lib\\site-packages\\matplotlib\\mpl-data\\sample_data\\ct.raw.gz' 

• 2023/11/26 Ver=1.04 Python 3.12.0 (matplotlib 3.8.1)で確認
• 2023/11/26 Ver=1.04 Python 3.11.6 (matplotlib 3.7.1)で確認
• 2023/04/02 Ver=1.03 Python 3.11.2 で確認
• 2020/10/31 Ver=1.01 Python 3.7.8 で確認
• 2018/12/03 Ver=1.01 初版リリース

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