python 学习 制作英文学习字典 DAY23

def rdic():
    fr = open('dic.txt','r')    
    for line in fr:
        line = line.replace("\n",'')
        v = line.split(':')
        dic[v[0]] = v[1]
        keys.append(v[0])
    fr.close()

def centre():
    n = input("请输入进入相应模块（添加、查询、退出）：")
    if n =="添加":
        key = input("请输入英文单词：")
        
        if key not in keys:
            value = input("请输入中文单词：")
            dic[key] = value
            keys.append(key)
            print("单词已经添加成功")
        else:
            print("该单词已经添加至字典库")
    elif n =="查询":
        key = input("请输入英文单词：")
        if key in keys:
            print("中文意思为："+dic[key])
        else:
            print("字典中未找到这个单词")
    elif n =="退出":        
        return 1
    else:        
        print("输入有误")
        return 0
    
def wdic():#写入文件代码 通过keys的顺序写入
    fw = open('dic.txt','w')
    for k in keys:
        fw.write(k+':'+dic[k]+'\n') 
    fw.close()

if __name__=="__main__":
    keys = [] #用来存储读取的顺序
    dic = {}
    while True:
        rdic()
        centre()
        wdic()
        if centre() == 0:
            continue
        elif centre() == 1:
            break