# Python program for generating diamond pattern in Python 3.7+


# Function to print upper half of diamond (pyramid)
def floyd(n):
 """
 Print the upper half of a diamond pattern with '*' characters.

 Args:
 n (int): Size of the pattern.

 Examples:
 >>> floyd(3)
 ' * \\n * * \\n* * * \\n'

 >>> floyd(5)
 ' * \\n * * \\n * * * \\n * * * * \\n* * * * * \\n'
 """
 result = ""
 for i in range(n):
 for _ in range(n - i - 1): # printing spaces
 result += " "
 for _ in range(i + 1): # printing stars
 result += "* "
 result += "\n"
 return result


# Function to print lower half of diamond (pyramid)
def reverse_floyd(n):
 """
 Print the lower half of a diamond pattern with '*' characters.

 Args:
 n (int): Size of the pattern.

 Examples:
 >>> reverse_floyd(3)
 '* * * \\n * * \\n * \\n '

 >>> reverse_floyd(5)
 '* * * * * \\n * * * * \\n * * * \\n * * \\n * \\n '
 """
 result = ""
 for i in range(n, 0, -1):
 for _ in range(i, 0, -1): # printing stars
 result += "* "
 result += "\n"
 for _ in range(n - i + 1, 0, -1): # printing spaces
 result += " "
 return result


# Function to print complete diamond pattern of "*"
def pretty_print(n):
 """
 Print a complete diamond pattern with '*' characters.

 Args:
 n (int): Size of the pattern.

 Examples:
 >>> pretty_print(0)
 ' ... .... nothing printing :('

 >>> pretty_print(3)
 ' * \\n * * \\n* * * \\n* * * \\n * * \\n * \\n '
 """
 if n <= 0:
 return " ... .... nothing printing :("
 upper_half = floyd(n) # upper half
 lower_half = reverse_floyd(n) # lower half
 return upper_half + lower_half


if __name__ == "__main__":
 import doctest

 doctest.testmod()