python - 在不覆盖现有键值对的情况下更新字典？

Question

我有一个如下的输入文件，我可以从中构建我的字典

一般格式

<IP_1>
KEY_1=VALUE_1
KEY_2=VALUE_2

<IP_2>
KEY_1=VALUE_1
KEY_2=VALUE_2

例子

192.168.1.1
USER_NAME=admin
PASSWORD=admin123

192.168.1.2
USER_NAME=user
PASSWORD=user123

预期的字典应该是这样的:

>>print dictionary_of_ip
{'192.168.1.1':{'USER_NAME'='admin','PASSWORD'='admin123'},
 '192.168.1.2':{'USER_NAME'='user','PASSWORD'='user123'}}

本质上是字典中的字典

下面是我的代码:

def generate_key_value_pair(filePath, sep='='):
    dict_of_ip = {}
    slave_properties = {}
    with open(filePath, "rt") as f:
        for line in f:
            stripped_line = line.strip()
            if stripped_line and stripped_line[0].isdigit():
                #print 'Found Ip'
                ip = stripped_line
                dict_of_ip[ip] = ''
            elif stripped_line and stripped_line[0].isupper():
                #print "Found attributes")
                key_value = stripped_line.split(sep)
                key = key_value[0].strip()
                value = key_value[1].strip()
                slave_properties[key] = value
                dict_of_ip[ip] = slave_properties

    return dict_of_ip

我能够按预期获得第一个 IP 及其属性，但第二个 IP 的第二组值覆盖了第一组。

>>print dict_of_ip
{'192.168.1.1': {'USER_NAME': 'user', 'PASSWORD': 'user123'},
 '192.168.1.2': {'USER_NAME': 'user', 'PASSWORD': 'user123'}}

dict_of_ip[ip] = slave_properties 导致覆盖。如何防止 '192.168.1.2' 键的值覆盖第一个值？

Answer 1

试试这个:

def generate_key_value_pair(filePath, sep='='):
    dict_of_ip = {}
    with open(filePath, "rt") as f:
        for line in f:
            stripped_line = line.strip()
            if stripped_line and stripped_line[0].isdigit():
                #print 'Found Ip'
                slave_properties = {}
                ip = stripped_line
                dict_of_ip[ip] = ''
            elif stripped_line and stripped_line[0].isupper():
                #print "Found attributes")
                key_value = stripped_line.split(sep)
                key = key_value[0].strip()
                value = key_value[1].strip()
                slave_properties[key] = value
                dict_of_ip[ip] = slave_properties

    return dict_of_ip

你在哪里使用相同的(修改过的)dict。我没有故意改变你的代码逻辑，只是将 slave_properties = {} 改成了它应该在的地方

您甚至可以删除您的slave_properties 并单独使用dict

def generate_key_value_pair(filePath, sep='='):
    dict_of_ip = {}
    with open(filePath, "rt") as f:
        for line in f:
            stripped_line = line.strip()
            if stripped_line and stripped_line[0].isdigit():
                #print 'Found Ip'
                ip = stripped_line
                dict_of_ip[ip] = {}
            elif stripped_line and stripped_line[0].isupper():
                #print "Found attributes")
                key_value = stripped_line.split(sep)
                key = key_value[0].strip()
                value = key_value[1].strip()
                dict_of_ip[ip][key] = value

    return dict_of_ip