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Published at Aug 20 2020
·
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Instructions

Test suite

Solution

Count the rectangles in an ASCII diagram like the one below.

```
+--+
++ |
+-++--+
| | |
+--+--+
```

The above diagram contains 6 rectangles:

```
+-----+
| |
+-----+
```

```
+--+
| |
| |
| |
+--+
```

```
+--+
| |
+--+
```

```
+--+
| |
+--+
```

```
+--+
| |
+--+
```

```
++
++
```

You may assume that the input is always a proper rectangle (i.e. the length of every line equals the length of the first line).

Sometimes it is necessary to raise an exception. When you do this, you should include a meaningful error message to indicate what the source of the error is. This makes your code more readable and helps significantly with debugging. Not every exercise will require you to raise an exception, but for those that do, the tests will only pass if you include a message.

To raise a message with an exception, just write it as an argument to the exception type. For example, instead of
`raise Exception`

, you should write:

```
raise Exception("Meaningful message indicating the source of the error")
```

To run the tests, run `pytest rectangles_test.py`

Alternatively, you can tell Python to run the pytest module:
`python -m pytest rectangles_test.py`

`pytest`

options-
`-v`

: enable verbose output -
`-x`

: stop running tests on first failure -
`--ff`

: run failures from previous test before running other test cases

For other options, see `python -m pytest -h`

Note that, when trying to submit an exercise, make sure the solution is in the `$EXERCISM_WORKSPACE/python/rectangles`

directory.

You can find your Exercism workspace by running `exercism debug`

and looking for the line that starts with `Workspace`

.

For more detailed information about running tests, code style and linting, please see Running the Tests.

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

```
import unittest
from rectangles import rectangles
# Tests adapted from `problem-specifications//canonical-data.json` @ v1.1.0
class RectanglesTest(unittest.TestCase):
def test_no_rows(self):
self.assertEqual(rectangles([]), 0)
def test_no_columns(self):
self.assertEqual(rectangles([""]), 0)
def test_no_rectangles(self):
self.assertEqual(rectangles([" "]), 0)
def test_one_rectangle(self):
self.assertEqual(rectangles(["+-+", "| |", "+-+"]), 1)
def test_two_rectangles_without_shared_parts(self):
self.assertEqual(rectangles([" +-+", " | |", "+-+-+", "| | ", "+-+ "]), 2)
def test_five_rectangles_with_shared_parts(self):
self.assertEqual(rectangles([" +-+", " | |", "+-+-+", "| | |", "+-+-+"]), 5)
def test_rectangle_of_height_1_is_counted(self):
self.assertEqual(rectangles(["+--+", "+--+"]), 1)
def test_rectangle_of_width_1_is_counted(self):
self.assertEqual(rectangles(["++", "||", "++"]), 1)
def test_1x1_square_is_counted(self):
self.assertEqual(rectangles(["++", "++"]), 1)
def test_only_complete_rectangles_are_counted(self):
self.assertEqual(rectangles([" +-+", " |", "+-+-+", "| | -", "+-+-+"]), 1)
def test_rectangles_can_be_of_different_sizes(self):
self.assertEqual(
rectangles(
[
"+------+----+",
"| | |",
"+---+--+ |",
"| | |",
"+---+-------+",
]
),
3,
)
def test_corner_is_required_for_a_rectangle_to_be_complete(self):
self.assertEqual(
rectangles(
[
"+------+----+",
"| | |",
"+------+ |",
"| | |",
"+---+-------+",
]
),
2,
)
def test_large_input_with_many_rectangles(self):
self.assertEqual(
rectangles(
[
"+---+--+----+",
"| +--+----+",
"+---+--+ |",
"| +--+----+",
"+---+--+--+-+",
"+---+--+--+-+",
"+------+ | |",
" +-+",
]
),
60,
)
if __name__ == "__main__":
unittest.main()
```

```
def rectangles(strings):
if len(strings) < 2:
return 0
matrix = [list(row) for row in strings]
length = len(matrix[0])
height = len(matrix)
rects = 0
def is_hor_conn(left, right, row):
for col in matrix[row][left+1:right]:
if col == ' ' or col == '|':
return False
return True
def is_ver_conn(top, bottom, col):
col_l = [matrix[row][col] for row in range(top+1,bottom)]
for c in col_l:
if c == ' ' or c == '-':
return False
return True
for y, row in enumerate(matrix):
for x, col in enumerate(row):
if col == '+':
for right in range(x+1, length):
if matrix[y][right] == '+' and is_hor_conn(x,right,y):
for bottom in range(y+1, height):
if ( matrix[bottom][x] == '+'
and matrix[bottom][right] == '+'
and is_ver_conn(y,bottom,x)
and is_ver_conn(y,bottom,right)
and is_hor_conn(x,right, bottom)):
#print(f"left:{x} right:{right} top:{y} bottom{bottom}")
rects += 1
return rects
```

A huge amount can be learned from reading other peopleâ€™s code. This is why we wanted to give exercism users the option of making their solutions public.

Here are some questions to help you reflect on this solution and learn the most from it.

- What compromises have been made?
- Are there new concepts here that you could read more about to improve your understanding?

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