def str2Int(s):        l = list(s)    if len(l) <= 0:        return 0    flag = 0    sum = 0    dict_num = {'0':0, '1':1, '2':2, '3':3, '4':4, '5':5, '6':6, '7':7, '8':8, '9':9}    dict_tag = {'+': 1, '-': -1} if not dict_tag.__contains__(l[0]) and not dict_num.__contains__(l[0]):    return 0elif dict_tag.__contains__(l[0]):    flag = dict_tag[l[0]]else:    sum += dict_num[l[0]]for i in range(1, len(l)):    if l[i] < '0' or l[i] > '9':        return 0    else:        sum = sum * 10 + dict_num[l[i]]if flag == -1:    return -sumelse:    return sum    
     
     
 
     
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