Question

我尝试使用词典创建数据库。我将字典转换成字符串，一旦我完成添加和删除它的东西，但是当我想保存字符串时，我希望键在彼此的新行上。

到目前为止，这是我的代码：

delete

保存到文件时，我想保存每个密钥及其信息，如下所示：

print('|-----Welcome to the Address Book-------|')
print('|----------------------------------------|')
print('|Please choice from the following:-------|')
print('|----------1: Find   Contact------------|')
print('|----------2: Add    Contact------------|')
print('|----------3: Delete Contact------------|')
print('|----------4: Quit Address Book----------|')

choice = [1, 2, 3, 4, 5]


document = open('addresses.txt', 'r+')
address = {}
for line in document:
    if line.strip():
        key, value = line.split(None, 1)
        address[key] = value.split()
document.close()
open('addresses.txt', 'w')

while 1:
    answer = 0
    while answer not in choice:
        try:
            answer = int(input("Enter here: "))
        except ValueError:
            0

    if answer == 1:
        x = input('Enter his/her name: ')
        if x in address:
            print("This is their address: ", address[x])
        else:
            print('Contact does not exist!')

    if answer == 2:
        x = (input('Enter new contact: '))
        x = x.replace(" ", "_")
        if x in address:
            while True:
                z = str(input('Contact '+x+' with address: '+str(address[x]) + ' already existed, do you want to override?(Yes/No)'))
                if z == 'yes':
                    b = input('Enter Address: ')
                    c = input('Enter postcode: ')
                    del address[x]
                    break

                elif z == 'no':
                    break
                else:
                    print('Please choose yes or no')

        else:
            b = input('Enter Address: ')
            c = input('Enter postcode: ')
        b = b.replace(" ", "_")
        c = c.replace(" ", "_")
        address[x] = b, c

    if answer == 3:
        z = input('Enter whom you would like to delete: ')
        if z in address:
            del address[z]
        else:
            print('Contact does not exist!')

    if answer == 4:
        a = "{}':(),[]"
        ok = str(address)

        for char in a:
            ok = ok.replace(char, "")

        document = open('addresses.txt', 'r+')
        document.write(ok + '\n')
        document.close()
        break

但是它保存的方式如下：

>Bob address postcode
>Sam address postcode

Answer 1

将文字写入文件时，请执行以下操作：

with open('/file/path', 'w') as f:
    for k, v in d.items():
        f.write(k + v + "\n")

这假设了一些事情：

您要覆盖该文件，而不是追加;如果您这样做，请将'w'切换为'a'
所有key和value项均为str

Answer 2

我不喜欢使用'r+'。当您想要从文件中读取时，您应open(filename, "r");当您想要读取文件时，open(filename, "w")应该{。}}}。在我看来，它更容易，因为在使用'r+'时，你必须考虑寻找的位置（你在编写/编辑某处时看到的闪烁光标）。为此你需要像：

file=open(filename,"r+")
file.seek(0)
file.write("something" + "\n")

嗯，我并没有真正使用"r+"方法，所以我不能再解释了。我建议您在文档中阅读更多相关信息。

Answer 3

如果您在屏幕上打印str(address)，您就会明白为什么会这样。 str命令将所有内容（即键和值）转换为连续字符串，并将其存储在文档文件中。

相反，您应该逐个保存地址簿的项目，迭代所有人。

ok = ""
for person in address:
    ok += person + " " + address[person] + "\n"

with open('addresses.txt', 'w') as file_out:
    file_out.write(ok)

需要帮助将信息放在文件中的新行上

3 个答案: