ValueError: not enough values to unpack (expected 4, got 1)

问题:

from sys import argv  script, first, second, third = argv print("The script is called: ", script) print("The first variable is: ", first) print("The second variable is: ", second) print("The third variable is: ", third) 

The error is at script, first, second, third = argv. I would like to understand why I am getting the error and how to fix it. Thank you!

回答1:

argv variable contains command line arguments. In your code you expected 4 arguments, but got only 1 (first argument always script name). You could configure arguments in pycharm. Go to Run -> Edit Configurations. Then create a new python configuration. And there you could specify Script parameters field. Or you could run your script from command line as mentioned by dnit13.

回答2:

Run it from the shell like this:

python script.py arg1 arg2 arg3 

回答3:

You could run it like this: python script.py first, second, third

回答4:

Try this, I tried it and it's working good

from sys import argv  script, first, second, third = argv,"Anything Here 1","Anything Here 2","Anything Here 3"  print("The script is called: ", script) print("The first variable is: ", first) print("The second variable is: ", second) print("The third variable is: ", third) 

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