IPython help:

3.11 (Miles Per Gallon) Drivers are concerned with the mileage obtained by their auto- mobiles. One driver has kept track of several tankfuls of gasoline by recording miles driven and gallons used for each tankful. Develop a sentinel-controlled-repetition script that prompts the user to input the miles driven and gallons used for each tankful. The script should calculate and display the miles per gallon obtained for each tankful. After process ing all input information, the script should calculate and display the combined miles per gallon obtained for all tankfuls (that is, total miles driven divided by total gallons used). Enter the gallons used (-1 to end): 12.8 Enter the miles driven: 287 The miles/gallon for this tank was 22.421875 Enter the gallons used (-1 to end): 10.3 Enter the miles driven: 200 The miles/gallon for this tank was 19.417475 Enter the gallons used (-1 to end): 5 Enter the miles driven: 120 The miles/gallon for this tank was 24.000000 Enter the gallons used (-1 to end): -1 The overall average miles/gallon was 21.601423