#55EasyLoops· Nested Loops

Pattern Printing with Nested Loops

Write `draw_pattern(kind, n)` that returns the rows of a text pattern as a list of strings. Rows never end with spaces. - `"triangle"`: row `i` (from 1 to `n`) has `i` stars. - `"inverted"`: the triangle upside down, starting with `n` stars. - `"pyramid"`: `n` rows, centred; row `i` (from 0) has `n - i - 1` leading spaces and `2 * i + 1` stars. - `"hollow_square"`: an `n` by `n` square whose border is stars and whose inside is spaces. - `"diamond"`: the pyramid followed by the pyramid's rows in reverse, without repeating the widest row (`2 * n - 1` rows in total). For any other `kind`, return an empty list.

Input format

`kind`: one of the names above (or anything else). `n`: the size.

Output format

A list of strings, one per row.

Examples

Input: kind = "pyramid", n = 3

Output: [" *"," ***","*****"]

Row 0 has 2 spaces and 1 star, row 1 has 1 space and 3 stars, row 2 has 5 stars.

Input: kind = "hollow_square", n = 4

Output: ["****","* *","* *","****"]

Only the first and last rows are full; the middle rows have stars at both ends.

Constraints

1 <= n <= 20

Study first

Loops in Python: while and for

#python
#loops
#nested-loops
#patterns