ASCII_KOCH_SNOWFLAKE.ipynb

Kernel: Python 3 (Ubuntu Linux)

__/\__

      __/\__
      \    /
__/\__/    \__/\__



                        __/\__
                        \    /
                  __/\__/    \__/\__
                  \                /
                  /_              _\
                    \            /
      __/\__      __/            \__      __/\__
      \    /      \                /      \    /
__/\__/    \__/\__/                \__/\__/    \__/\__

n = '\n'
S = '_a/G\F I\n'
A = dict(zip(S, ('III', '   ', '__/', '  G', '\  ', 'F__', '   ', 'III', '')))
B = dict(zip(S, ('III', '   ', '\  ', ' aF', '/a ', '  G', '   ', 'III', '')))
C = dict(zip(S, ('___', 'aaa', '/  ', 'GII', 'II\\', '  F', '   ', 'III', '')))


def T(s):
    a = b = c = d = r = u''
    for k in s:
        a += A[k]
        b += B[k]
        c += C[k]
        if k == 'I':
            a = a[:-3] + ('II\\' if 'a ' == d[1:3] else
                          'GII' if ' a' == d[:2] else 3 * k)
        d = d[3:]
        if k == n:
            d = c.replace('____', '__/F').replace('aaaa', 'aa  ').replace(
                '/  a', '/a  ').replace('a  F', '  aF')
            r += a + n + b + n + d + n
            a = b = c = ''
    return r

def iterate(m):
    output = T('__\n\G\n')
    for _ in range(m-1):
        output = T(output)
    return output.translate({97: 95, 71: 47, 73: 32, 70: 92})

print(iterate(3))

                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                        __/\__                        
                        \    /                        
                  __/\__/    \__/\__                  
                  \                /                  
                  /_              _\                  
                    \            /                    
      __/\__      __/            \__      __/\__      
      \    /      \                /      \    /      
__/\__/    \__/\__/                \__/\__/    \__/\__
\                                                    /
/_                                                  _\
  \                                                /  
__/                                                \__
\                                                    /
/_  __                                          __  _\
  \/  \                                        /  \/  
      /_                                      _\      
        \                                    /        
      __/                                    \__      
      \                                        /      
__/\__/                                        \__/\__
\                                                    /
/_                                                  _\
  \                                                /  
__/                                                \__
\                                                    /
/_  __      __  __                  __  __      __  _\
  \/  \    /  \/  \                /  \/  \    /  \/  
      /_  _\      /_              _\      /_  _\      
        \/          \            /          \/        
                  __/            \__                  
                  \                /                  
                  /_  __      __  _\                  
                    \/  \    /  \/                    
                        /_  _\                        
                          \/