[Python] Why are multiple expressions and statements placed on one line in Python and not...

I am coming from a Javascript background and am learning Python. I have been working on list exercises and saw this question and then then solution.

Given a list of integers, replace every element with the greatest element among the elements to its right, and replace the last element with -1.

Example:

Input: [17, 18, 5, 4, 6, 1]
Output: [18, 6, 6, 6, 1, -1]
​

def greatest_on_right(lst):
max_val = -1
# we are starting at the end of the range and stepping down -1 and stopping when we get to -1 (past index 0)
for i in range(len(lst) -1, -1, -1):
# don't understand why these all have to be on the same line
lst, max_val = max_val, max(max_val, lst)
return lst


Input list: [17, 17, 19, 5, 4, 6, 1]
Output on one line: [19, 19, 6, 6, 6, 1, -1]
Output on separate lines: [17, 17, 19, 5, 4, 6, 1]

The comments are my understanding of how it works. When I tried placing the items below the for loop on individual lines, the return value was the original list. I have not been able to find mention of the style in the docs or PEP 8.

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