Mean, Max, Min

# Input players scores and calculate seasons performance

# List Variable for players performance
performance = []
# Function to calculate average
def players_average(players_performance):
    difference = 0	# set variable to 0 at start
    played = 0
    for item in performance:  # total the values in list
        difference += item
        played += 1		# counting how many items there are
    return difference / played		# return total divided by count

# Variable to keep loop running
more = 'Y'
# Get players scores from user
while more == 'Y':
    points_for = int(input("What did player score "))
    points_against = int(input("What did the opponent score "))
    performance.append(points_for - points_against)
    more = (input("Input another score  Y  or N ")).upper()
    print()

# Produce output using my average function and built in max and min
print("Players average is {}".format(players_average(performance)))
print("Players best win was by {} points".format(max(performance)))
print("Players worst defeat was {} points".format(min(performance)))