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Changing in Place
It's fairly common to want to change the value of a variable based on its current value.
player_score = 4
player_score = player_score + 1
# player_score now equals 5
player_score = 4
player_score = player_score - 1
# player_score now equals 3
Don't let the fact that the expression player_score = player_score - 1 is not a valid mathematical expression confuse you. It doesn't matter, it is valid code. It's valid because the way the expression should be read in English is:
Assign to
player_scorethe current value ofplayer_scoreminus 1
In this operation, the right-hand side (player_score - 1) is calculated first. Once we have the result, we update player_score with this new value.
Assignment
Complete the update_player_score function. It should add increment to current_score and then return the new current_score.