python怎么把多个字典变成一个字典？

Python编程将多个字典文件合并成一个字典文件，代码如下：//例子：合并a.txt和b.txt两个字典文件def readf(filename): lines = file(filename).readlines() dic = {} for i in lines: i_ = i.split() dic[i_[0]] = int(i_[1]) return dic dica = readf('a.txt')dicb = readf('b.txt') lines = []for i in dica: percent = str(float(dicb[i])*100/dica[i])+'%' s = ' '.join([i, str(dica[i]), str(dicb[i]), percent]) s += 'n' lines.append(s)//合并成一个字典文件c.txt with open('c.txt', 'w') as f: f.writelines(lines) f.close()