ValueError: not enough values to unpack (Expected 2, got 0) sometimes appears when reading TXT files. The reason I found myself is that there are several blank lines at the end of the TXT file. Delete the last blank line and make sure that the last line is the text you want to read. The TXT file looks like nothing if you press Enter at the end, but those empty lines actually have one character, the newline \n, so there can be no empty lines.
 

Just like that the blank line between the cursor and the text actually has a newline character on each line.
Click Backspace to go back to your last line of text. Press the direction key of the keyboard cursor can not get down.

Not enough values to unpack (expected 2, got 1


where the code was originally of type array

so fenzi_test is substituted here as an array

so m,n is wrong
Showed by an example, the

you can see that the shape of array and matrix lose unless the result is not the same m, n = np. Shape (data)
so, change the type

When I first started learning Python, I found an exception when I ran the web.py home page test code.
The code is as follows:

import web
        
urls = (
    '/(.*)', 'hello'
)
app = web.application(urls, globals())

class hello:        
    def GET(self, name):
        if not name: 
            name = 'World'
        return 'Hello, ' + name + '!'

if __name__ == "__main__":
    app.run()

The exceptions are as follows:

Traceback (most recent call last):
  File "C:\Users\HHHHH\AppData\Local\Programs\Python\Python37-32\lib\site-packages\web\utils.py", line 526, in take
    yield next(seq)
StopIteration

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "D:\workspace\HelloPython\Helloworld.py", line 7, in <module>
    app = web.application(urls, globals())
  File "C:\Users\HHHHH\AppData\Local\Programs\Python\Python37-32\lib\site-packages\web\application.py", line 62, in __init__
    self.init_mapping(mapping)
  File "C:\Users\HHHHH\AppData\Local\Programs\Python\Python37-32\lib\site-packages\web\application.py", line 130, in init_mapping
    self.mapping = list(utils.group(mapping, 2))
  File "C:\Users\HHHHH\AppData\Local\Programs\Python\Python37-32\lib\site-packages\web\utils.py", line 531, in group
    x = list(take(seq, size))
RuntimeError: generator raised StopIteration

 
Follow the exception prompt to find the appropriate code (… Utils.py “, line 531, in group), as follows:

Here, call line 524 take method and modify it as follows according to the information on the official website (note the indentation) :

Restart successfully after modification:

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