human
Create a list of tuples with adjacent list elements if a condition is true
assistant
Here is some code to create a list of tuples which contains number 9 and the number before it, for each occurrence of 9 in the list 'myList'

[(x, y) for x, y in zip(myList, myList[1:]) if y == 9]

#Warning: this code generation is experimental. Please inspect the code for any bugs before executing.