pointsNumber = input("Please enter the number of points you want: ")

coordinates = [[0 for x in range(3)] for y in range(pointsNumber)]
print(coordinates)

for i in range(pointsNumber):
    for item in list(zip(range(3), 'XYZ')):
        coordinates[i][item[0]] = input("Enter point " + str(i) + " coordinate " + str(item[1]) + ": ")

# print coordinates just to verify
print(coordinates)