Errors about sys arguments

[trombz]

Hello,

From the video course I typed everything as perfect as it is and no matter what framework I tried to run(Jupyter-notebook,from terminal(ipython),Colab(from google) and even also tried using Pycharm I get the following error:

---

ValueError Traceback (most recent call last)
Input In [72], in <cell line: 30>()
27 axes.text(text_x, text_y, text, ha='center', va='bottom')
29 # read command-line arguments for number of frames and rolls per frame
---> 30 number_of_frames = int(sys.argv[1])
31 rolls_per_frame = int(sys.argv[2])
33 sns.set_style('whitegrid') # white backround with gray grid lines

ValueError: invalid literal for int() with base 10: '-f'

I just found your github now Paul and I also copied your code to my jupyter notebook and still got the same error message. What it does mean?

[pdeitel]

Hi @trombz, Please tell me specifically which example this is for? Which section of the book is it in. Thanks! Paul

[pdeitel]

I think what's going on here is that you're using the command-line arguments feature in Jupyter/Colab/PyCharm, but no arguments are being supplied. If you run the program as a script from the command-line, then you can pass in the required arguments. If you put the code in Jupyter/Colab/PyCharm, you would not use the sys.argv -- you'd just assign the values to variables.

[trombz]

Hi Paul,

It's about ch06, [RollDieDynamic.py].

[pdeitel]

This script is meant to be executed from a .py file at the command line, not in a Python IDE, Jupyter or Colab. That's why you're getting the exception--there are no command-line arguments to convert to integers

[trombz]

I think what's going on here is that you're using the command-line arguments feature in Jupyter/Colab/PyCharm, but no arguments are being supplied. If you run the program as a script from the command-line, then you can pass in the required arguments. If you put the code in Jupyter/Colab/PyCharm, you would not use the sys.argv -- you'd just assign the values to variables.

Thanks for the reply!Indeed it worked as soon as I tried to run from ipython!