How to parse a string and return a nested array?

Question

I want a Python function that takes a string, and returns an array, where each item in the array is either a character, or another array of this kind. Nested arrays are mark

Answer 1

Recursion is something very powerful that you should try to use.

Here is my code:

    # encoding: utf-8
    # Python33

    def check(s):
        cs = [c for c in s if c == '(' or c ==')']
        flag = 0
        for c in cs:
            if flag < 0:
                return 'opening bracket is missing'        
            if c == '(':
                flag += 1
            else:
                flag -= 1
        if flag < 0:
            return 'opening bracket is missing'
        elif flag > 0:
            return 'closing bracket is missing'
        else:
            return ''

    def _foo(cs):
        result = []
        while len(cs):
            c = cs.pop(0)
            if c == '(':
                result.append(_foo(cs))
            elif c == ')':
                return result
            else:
                result.append(c)
        return result

    def foo(s):
        valiad = check(s)
        if valiad:
            return valiad
        cs = list(s)
        return _foo(cs)

    if __name__ == '__main__':
        ss = ["abc","a(b)c","a(b(c))","a(b(c)","a(b))c","a)b(c"]
        for s in ss:
            print(foo(s))