to_numpy() works in jupyter notebook, but not in python script

[bluefrog]

I have 0.23 on my Ubuntu Linux, but 0.24 on my miniconda environment.

I used sudo apt-get install in an attempt to update pandas to 0.24, but I get this message:

$ sudo apt-get install python3-pandas
Reading package lists... Done
Building dependency tree       
Reading state information... Done
python3-pandas is already the newest version (0.23.3+dfsg-3ubuntu1).
The following packages were automatically installed and are no longer required:
..
....
cosmic
Use 'sudo apt autoremove' to remove them.
0 to upgrade, 0 to newly install, 0 to remove and 3 not to upgrade.

So it won't update to 0.24.
At least I know what the issue now.
Thanks for your help.

---

thanks for the upgrade info.
I had to install pip first using sudo apt-get install python3-pip, and then I was able to
"$ pip3 install --upgrade pandas".
So now the script works.
thanks to everybody for your help.