Problem 5, Part 2¶

Draw the following pattern:

....1....
...222...
..33333..
.4444444.
555555555
.6666666.
..77777..
...888...
....9....

You are given the size of the image (as height).

Data:

`DIGITS_RE`	Express a sequence of digits
`PATTERN_RE`	Express the output line

Functions:

draw(height)

Draw the pattern of size given as height and return the text lines.

DIGITS_RE = re.compile('\\d+')¶: Express a sequence of digits

PATTERN_RE = re.compile('^(?P<leftpad>[.]*)\\d+(?P<rightpad>[.]*)$')¶: Express the output line

draw(height: int) → Lines[source]¶

Draw the pattern of size given as height and return the text lines.

Requires

height <= 9
height % 2 == 1
height > 0

Ensures

len(result) == height
all(len(line) == height for line in result)

all(
(
        mtch := PATTERN_RE.match(line),
        mtch is not None
        and mtch.group('leftpad') == mtch.group('rightpad')
)[1]
for line in result)

(
        middle := int(height / 2),
        DIGITS_RE.fullmatch(result[middle])
)[1]