Test doesnt run

  I would like to give some feedback about ...

The code gets stuck in loading, it should pass.

From: http://www.checkio.org/mission/find-friends/solve/

HTTP\_USER\_AGENT:

    Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.125 Safari/537.36

My Code:

    def check_connection(network, first, second):
        future = []
        visited = []
        dic = {}
        for i in network:
            a = i.split('-')
            if a[0] in dic and dic[a[0]] != a[1]:
                dic[a[0]].append(a[1])
            else:
                dic[a[0]] = [a[1]]
            if a[1] in dic and dic[a[1]] != a[0]:
                dic[a[1]].append(a[0])
            else:
                dic[a[1]] = [a[0]]
            if [a[0]] in dic.values():
                for key,val in dic.items():
                    if a[1] == key:
                        break
                    elif (''.join(ch for ch in val if ch.isalnum())) == str(a[0]):
                        dic[str(a[0])].append(key)
                        break  
        if first in dic:
            for i in dic[first]:
                if i == second:
                    return True
                else:
                    future.append(i)
    
            while len(future) != 0:
                for i in future:
                    for g in dic[i]:
                        if g == second:
                            return True
                        else:
                            future.append(g)
                    future.remove(i)
        else:
            return False