unbracket.py

#!/usr/bin/python3
import sys, itertools, re

def prime(n):
    primes = []

    for number in itertools.count(2):
        if all(number%prime for prime in primes):
            primes.append(number)
            if len(primes) == n:
                break

    return primes[-1]

def unbracket(brackets):
    result = 1
    counter = 0
    substring = ''
    for char in brackets:
        if char == '<':
            counter += 1
        elif char == '>':
            counter -= 1
        else:
            sys.exit('Invalid character')
        if counter < 0:
            sys.exit('Unmatched brackets')
        substring += char
        if counter == 0:
            result *= prime(unbracket(substring[1:-1]))
            substring = ''
    if counter > 0:
        sys.exit('Unmatched brackets')
    return result

brackets = ''.join(sys.argv[1:]) if len(sys.argv) > 1 else sys.stdin.read()
#brackets = brackets.translate(str.maketrans('', '', string.whitespace))
brackets = re.sub(r'\s', '', brackets)
brackets = re.sub(r'[oO0\.◇☐□◯〇۝•]', '<>', brackets)
brackets = re.sub(r'[{[(^1◠⸦⎴]', '<', brackets)
brackets = re.sub(r'[}\])vV0◡⸧⎵]', '>', brackets)
brackets = re.sub(r'[⟪⟦⦃«]', '<<', brackets)
brackets = re.sub(r'[⟫⟧⦄»]', '>>', brackets)
brackets = re.sub(r'[⊙۞]', '<<>>', brackets)
brackets = re.sub(r'[⚇]', '<<><>>', brackets)
brackets = re.sub(r'[:∞]', '<><>', brackets)
brackets = re.sub(r'[xX]', '><', brackets)
brackets = re.sub(r'[⚀⚁⚂⚃⚄⚅]', lambda x:'<'+(ord(x.group(0))-9855)*'<>'+'>', brackets)
#brackets = re.sub(r'\(\.+\)', lambda x:x.group(0)[1:-1].replace('.', '<>'), brackets)
brackets = re.sub(r'[a-z]', lambda x:(ord(x.group(0))-96)*'<'+(ord(x.group(0))-96)*'>', brackets)

print(brackets)
print(unbracket(brackets))