Balanced brackets problem from Hackerrank

balancedbrackets.py

def  balanced( a_str):
    if len(a_str) %2 !=0:
        return False
    
    open_bracks = ['(', '{', '[']
    close_bracks = [')', '}', ']']
    par_dict = {open_bracks[0]:close_bracks[0], open_bracks[1]:close_bracks[1], open_bracks[2]:close_bracks[2]} 
    
    if a_str[0] in close_bracks:
        return False
    if a_str[-1] in open_bracks:
        return False
    
    match = []
    for i in a_str:
        if i in open_bracks:
            match.append(par_dict[i])
        elif i in close_bracks:
            if not match or i != match.pop():
                return False
            
        
    return not match