I tried to add my own code, and I couldn’t, and another issue is that, shift+Enter does not work too.
You can add code to cells that started as
# GRADED FUNCTION. You cannot add your own code to the other cells. Also, you have to add your code between two lines only, as shown below. No need to add somewhere else.
# YOUR CODE STARTS HERE
# YOUR CODE ENDS HERE
Regarding the Shift+Enter, you have to wait until the previous cell has finished running before running the next cell. You can do this by waiting for the asterisk * in the brackets next to the cell to disappear.
Thanks for your kind answer, I was just about to delete the topic,
the problem was caused by an extension that I have previously installed on my chrome.
I disabled it and all went well!
I am glad you solved the problem.
so i don’t need to write the entire code?
You have to write your code between these two lines:
### YOUR CODE STARTS HERE ###
### YOUR CODE ENDS HERE ###