Опубликован: 12.07.2013 | Доступ: свободный | Студентов: 910 / 28 | Длительность: 37:41:00
Теги:
Лекция 13:

# Sonar Treasure Hunt

< Лекция 12 || Лекция 13: 12345 || Лекция 14 >
Аннотация: The game in this chapter only introduces a couple new helpful methods that come with Python, the remove list method and the isdigit() string method.

### Topics Covered In This Chapter:

• Data structures.
• The remove() list method.
• The isdigit() string method.
• The sys.exit() function.

The game in this chapter only introduces a couple new helpful methods that come with Python, the remove() list method and the isdigit() string method. But this is the first program which will make use of Cartesian coordinates and the mathematical concepts we learned in "Bagels" . This program will also use make use of data structures (which is really just a fancy way of saying variables that contain lists of lists.) As our games become more complicated, we will need to store our data in well-organized ways.

Sonar is a technology that ships use to locate objects under the sea. In this chapter's game, the player places sonar devices at various places in the ocean to locate sunken treasure chests. The sonar devices (in our game) can tell the player how far away a treasure chest is from the sonar device, but not in what direction. But by placing multiple sonar devices down, the player can figure out where exactly the treasure chest is.

There are three chests to collect, but the player has only sixteen sonar devices to use to find them. Imagine that we could not see the treasure chest in the following picture. Because each sonar device can only find the distance but not direction, the possible places the treasure could be is anywhere in a ring around the sonar device (see Figure 13.1).

Рис. 13.1. The first sonar device shows a ring of possible places the treasure could be located.

Рис. 13.2. Combining the rings of all three sonar devices shows only one possible place for the treasure.

But if we have multiple sonar devices working together, we can narrow it down to an exact place where all the rings intersect each other. (See Figure 13.2)

### Sample Run

```S O N A R !
Would you like to view the instructions? (yes/no)
no
1         2         3         4         5
012345678901234567890123456789012345678901234567890123456789
0 `~~~`~~~`~`~~`~~~~~`~``~~~~`~`~~~`~``~``~~````~`~```~`~~~~`` 0
1 ~`~~~```~~~~`~`~~`~``~`~~```~`~`~~`~`~~~~~~`~`````~`~~`~~~~` 1
2 `~``~``~~~`~``~`~`~``~`````~~~~~~~~~`~`~~`~``~~~~~```~~`~``` 2
3 ``~`~~``~`~``~`~`~`~~`~`~~`~`~``~~~`~``~````~``````~~~~``~`` 3
4 ``~~`~~~~~~``~~````~`~`~`~``~~~``~~```~`~~`~~`~`~`~~`~~~~``` 4
5 ~~```~~~`~`~~``~`~``~```~`~~`~~~~~`~~``~`~`~~~`~~`~`~`~`~~~~ 5
6 ``~~`````~~~~`~`~~~```~~~~`~~`~~`~~```~~`~~~~~~~~~~`~~~~~~~~ 6
7 `~`````````~```~``~``~~`~~~~`~~``~``~~~```~`~~`~``~``~~```~~ 7
8 `~````~```~`~~`~~~`~~``~~~``~`~``~~~``~`~`````~`~~```~`~~~~~ 8
9 ~```~~`~`~``~``~~``~``~```~`~``~~~~`~`~`~~~`~`~`~`~~~~~~~``` 9
10 ```~`~```~``~``~`~~`~``~````~``~~~`~~`~~``~~~~`~~~`~`~~````~ 10
11 ```~```~~~`~```~~`~~~`~`````~`~~`~`~~`~~`~`~~`~~~~~~~~````~` 11
12 ~~~`~`~~~~~~~~~~~~~~~~~~`~`~~`~`~~`~```~~~~~`~~`~~`~``~``~`~ 12
13 `~~````~~``~```~~~`~```~`~~~~~~~~~`~~``~~~~~`````~`~`~``~~~~ 13
14 `~~`~`~````~```~`~`~```~~`~~~~`~```~``~``~``~~~````~~``````~ 14
012345678901234567890123456789012345678901234567890123456789
1         2         3         4         5
You have 16 sonar devices left. 3 treasure chests remaining.
Where do you want to drop the next sonar device? (0-59 0-14) (or type quit)
10 10
1         2         3         4         5
012345678901234567890123456789012345678901234567890123456789
0 `~~~`~~~`~`~~`~~~~~`~``~~~~`~`~~~`~``~``~~````~`~```~`~~~~~~ 0
1 ~`~~~```~~~~`~`~~`~``~`~~```~`~`~~`~`~~~~~~`~`````~`~~`~~~~~ 1
2 `~``~``~~~`~``~`~`~``~`````~~~~~~~~~`~`~~`~``~~~~~```~~`~``` 2
3 ``~`~~``~`~``~`~`~`~~`~`~~`~`~``~~~`~``~````~``````~~~~``~`` 3
4 ``~~`~~~~~~``~~````~`~`~`~``~~~``~~```~`~~`~~`~`~`~~`~~~~``` 4
5 ~~```~~~`~`~~``~`~``~```~`~~`~~~~~`~~``~`~`~~~`~~`~`~`~`~~~~ 5
6 ``~~`````~~~~`~`~~~```~~~~`~~`~~`~~```~~`~~~~~~~~~~`~~~~~~~~ 6
7 `~`````````~```~``~``~~`~~~~`~~``~``~~~```~`~~`~``~``~~```~~ 7
8 `~````~```~`~~`~~~`~~``~~~``~`~``~~~``~`~`````~`~~```~`~~~~~ 8
9 ~```~~`~`~``~``~~``~``~```~`~``~~~~`~`~`~~~`~`~`~`~~~~~~~``` 9
10 ```~`~```~~`~``~`~~`~``~````~``~~~`~~`~~``~~~~`~~~`~`~~````~ 10
11 ```~```~~~`~```~~`~~~`~`````~`~~`~`~~`~~`~`~~`~~~~~~~~````~` 11
12 ~~~`~`~~~~~~~~~~~~~~~~~~`~`~~`~`~~`~```~~~~~`~~`~~`~``~``~`~ 12
13 `~~````~~``~```~~~`~```~`~~~~~~~~~`~~``~~~~~`````~`~`~``~~~~ 13
14 `~~`~`~````~```~`~`~```~~`~~~~`~```~``~``~``~~~````~~``````~ 14
012345678901234567890123456789012345678901234567890123456789
1         2         3         4         5
Treasure detected at a distance of 5 from the sonar device.
You have 15 sonar devices left. 3 treasure chests remaining.
Where do you want to drop the next sonar device? (0-59 0-14) (or type quit)
15 6
1         2         3         4         5
012345678901234567890123456789012345678901234567890123456789
0 `~~~`~~~`~`~~`~~~~~`~``~~~~`~`~~~`~``~``~~````~`~```~`~~~~~~ 0
1 ~`~~~```~~~~`~`~~`~``~`~~```~`~`~~`~`~~~~~~`~`````~`~~`~~~~~ 1
2 `~``~``~~~`~``~`~`~``~`````~~~~~~~~~`~`~~`~``~~~~~```~~`~``` 2
3 ``~`~~``~`~``~`~`~`~~`~`~~`~`~``~~~`~``~````~``````~~~~``~`` 3
4 ``~~`~~~~~~``~~````~`~`~`~``~~~``~~```~`~~`~~`~`~`~~`~~~~``` 4
5 ~~```~~~`~`~~``~`~``~```~`~~`~~~~~`~~``~`~`~~~`~~`~`~`~`~~~~ 5
6 ``~~`````~~~~`~4~~~```~~~~`~~`~~`~~```~~`~~~~~~~~~~`~~~~~~~~ 6
7 `~`````````~```~``~``~~`~~~~`~~``~``~~~```~`~~`~``~``~~```~~ 7
8 `~````~```~`~~`~~~`~~``~~~``~`~``~~~``~`~`````~`~~```~`~~~~~ 8
9 ~```~~`~`~``~``~~``~``~```~`~``~~~~`~`~`~~~`~`~`~`~~~~~~~``` 9
10 ```~`~```~5`~``~`~~`~``~````~``~~~`~~`~~``~~~~`~~~`~`~~````~ 10
11 ```~```~~~`~```~~`~~~`~`````~`~~`~`~~`~~`~`~~`~~~~~~~~````~` 11
12 ~~~`~`~~~~~~~~~~~~~~~~~~`~`~~`~`~~`~```~~~~~`~~`~~`~``~``~`~ 12
13 `~~````~~``~```~~~`~```~`~~~~~~~~~`~~``~~~~~`````~`~`~``~~~~ 13
14 `~~`~`~````~```~`~`~```~~`~~~~`~```~``~``~``~~~````~~``````~ 14
012345678901234567890123456789012345678901234567890123456789
1         2         3         4         5
Treasure detected at a distance of 4 from the sonar device.
You have 14 sonar devices left. 3 treasure chests remaining.
Where do you want to drop the next sonar device? (0-59 0-14) (or type quit)
15 10
1         2         3         4         5
012345678901234567890123456789012345678901234567890123456789
0 `~~~`~~~`~`~~`~~~~~`~``~~~~`~`~~~`~``~``~~````~`~```~`~~~~`` 0
1 ~`~~~```~~~~`~`~~`~``~`~~```~`~`~~`~`~~~~~~`~`````~`~~`~~~~` 1
2 `~``~``~~~`~``~`~`~``~`````~~~~~~~~~`~`~~`~``~~~~~```~~`~``` 2
3 ``~`~~``~`~``~`~`~`~~`~`~~`~`~``~~~`~``~````~``````~~~~``~`` 3
4 ``~~`~~~``~``~~````~`~`~`~``~~~``~~```~`~~`~~`~`~`~~`~~~~``` 4
5 ~~```~~~`~`~~``~`~``~```~`~~`~~~~~`~~``~`~`~~~`~~`~`~`~`~~~` 5
6 ``~~`````~~~~`~O~~~```~~~~`~~`~~`~~```~~`~~~`~~~``~`~~~``~~~ 6
7 `~`````````~```~``~``~~`~~~~`~~``~``~~~```~`~~`~``~``~~```~~ 7
8 `~````~```~`~~`~~~`~~``~~~``~`~``~~~``~`~`````~`~~```~`~~~~` 8
9 ~```~~`~`~``~``~~``~``~```~`~``~~~~`~`~`~~~`~`~`~`~~~``~~``` 9
10 ```~`~```~O`~``O`~~`~``~````~``~~~`~~`~~``~~~~`~~~`~`~~````~ 10
11 ```~```~~~`~```~~`~~~`~`````~`~~`~`~~`~~`~`~~`~~~````~````~` 11
12 ~~~`~`~~~``~~~~~~`~~~``~`~`~~`~`~~`~```~~~```~~`~~`~``~``~`~ 12
13 `~~````~~``~```~~~`~```~`~~~~~~~~~`~~``~~~~~`````~`~`~``~~~~ 13
14 `~~`~`~````~```~`~`~```~~`~~~~`~```~``~``~``~~~````~~``````~ 14
012345678901234567890123456789012345678901234567890123456789
1         2         3         4         5
You have found a sunken treasure chest!
You have 13 sonar devices left. 2 treasure chests remaining.
Where do you want to drop the next sonar device? (0-59 0-14) (or type quit)
...skipped over for brevity....
1         2         3         4         5
012345678901234567890123456789012345678901234567890123456789
0 `~~~`~~~`~`~~`~~~~~`~``~~~~`~`~~~`~``~``~~````~`~```~`~~~~`` 0
1 ~`~~~```~~~~`~`~~`~``~`~~```~O~`~~`~`~~~~~~`~`````~`~~`~~~~` 1
2 `~``~``~~~`~``~`~`~``~`````~~O~~~O~~`~`~~`~``~~~~~```~~`~``` 2
3 ``~3~~``8`~``~`~`~`~~`~`~~`~`~``~~~`~`O~````~``````~~~~``~`` 3
4 ``~~`~~~``~``~~````~`~`~`~O`~~O``~~```~`~~`~~`~`~`~~`~~~~``` 4
5 ~~```~~~`~`~~``~`~``~```~`~~`~~~~~`~~``~`~`~~~`~~`~`~`~`~~~` 5
6 ``~~`````~~~~`~O~~~```~~~~`~~`~~`~~```~~`~~~`~~~``O`~~~``~~~ 6
7 `~`````````~```~``~``~~`~~~~`~~``~``~~~```~`~~`~``~``~~```~~ 7
8 `~````~```~`~~`~~~`~~``~~~``~`~``~~~``~`O```0`~`~~```~`~~~~` 8
9 ~```~~`~`~``~``~~``~``~```~O~``~~~~`~`~`~~~`~`~`~`~~~``~~``` 9
10 ```~`~```~O`~``O`~~`~``~````~``~~~`~~`~~``~~~~`~~~`~`~~````~ 10
11 ```~```~~~`~```~~`~~~`~`````~`~~`~`~~`~~`~`~~`~~~````~````~` 11
12 ~~~`~`~~~``~~~~~~`~~~``~`~`~~`~`~~`~```~~~```~~`~~`~``~``~`~ 12
13 `~~````~~``~```~~~`~```~`~~~~~~~~~`~~``~~~~~`````~`~`~``~~~~ 13
14 `~~`~`~````~```~`~`~```~~`~~~~`~```~``~``~``~~~````~~``````~ 14
012345678901234567890123456789012345678901234567890123456789
1         2         3         4         5
Treasure detected at a distance of 4 from the sonar device. We've run out
of sonar devices! Now we have to turn the ship around and head for home with
treasure chests still out there! Game over.
The remaining chests were here: 0, 4 Do you want to play again? (yes or no)
no
```
< Лекция 12 || Лекция 13: 12345 || Лекция 14 >