Python 将字符串模式存储为JSON文件

问题描述

我有一段代码，试图在字符串中找到匹配的模式。我想将这些模式存储在JSON文件中，因此我将这些Python字符串转换为JSON格式。但是，它不起作用，我得到了错误的匹配结果，其中不包含正确数量的值。

这是我的Python模式列表的样子：

patterns = [
    r"^vol\.(\d+),no\.(\d+)\((\d+)\),p\.(\d+)-(\d+) $", #Vol. 12, no. 3, (2009), p. 118-120 r"^vol\.(\d+),no\.(\d+)\((\d+)\),p\.\[(\d+)-(\d+)\]$ ", #vol.1,no.7(2022),p.[1-6]
    r"^vol\.(\d+),no\.(\d+)\((\d+)\),p\.(\d+-\d+)-(\d+-\d+) $", #vol.10,no.3(2018),p.03015-1-03015-4 r"^vol\.(\d+),no\.([\d-]+)\((\d+)\)p\.(\d+)-(\d+)$ ",
    r"^vol(\d+),no\.([\d-]+)\((\d+)\),p\.(\d+)-(\d+) $", r"^vol\.(\d+[a-z]?),no\.(\d+)\((\d+)\),p\.(\d+)-(\d+)$ ", #Vol. 35A, no. 3 (2004), p. 751-759
    r"^vol\.(\d+),no\.([\d,]+)\((\d+)\),p\.(\d+)-(\d+) $", #Vol. 17, no. 7,8,9,10(2020), p. 573 - 582 r"^vol\.(\d+),no\.([\w]+)\((\d+)\),p\.(\d+)-(\d+)$ " # vol.7,no.6C(2019),p.38-45
    ]

这是我在json中的方式:

{
    "patterns": [
        "^vol\\.(\\d+),no\\.(\\d+)\\((\\d+)\\),p\\.(\\d+)-(\\d+) $", "^vol\\.(\\d+),no\\.(\\d+)\\((\\d+)\\),p\\.\\[(\\d+)-(\\d+)\\]$ ",
        "^vol\\.(\\d+),no\\.(\\d+)\\((\\d+)\\),p\\.(\\d+-\\d+)-(\\d+-\\d+) $", "^vol\\.(\\d+),no\\.[\\d-]+\\((\\d+)\\)p\\.(\\d+)-(\\d+)$ ",
        "^vol(\\d+),no\\.[\\d-]+\\((\\d+)\\),p\\.(\\d+)-(\\d+) $", "^vol\\.(\\d+[a-z]?),no\\.(\\d+)\\((\\d+)\\),p\\.(\\d+)-(\\d+)$ ",
        "^vol\\.(\\d+),no\\.[\\d,]+\\((\\d+)\\),p\\.(\\d+)-(\\d+) $", "^vol\\.(\\d+),no\\.[\\w]+\\((\\d+)\\),p\\.(\\d+)-(\\d+)$ "
    ]
}

这是我使用它们的示例，并帮助打印出错误：

config_filename = "configuration\most_used_patterns_Vol_Iss_Year_Page.json"
config = load_config(config_filename)
if config is not None:
    patterns = config.get('patterns', [])

for pattern in patterns:
    match = re.match(pattern, row)
    if match:
        print(pattern)
        print(match)
        groups = match.groups()
        print(groups[0])
        print(groups[1])
        print(groups[2])
        print(groups[3])
        volume, issue, year, start_page, end_page = match.groups()

输出：

^vol\.(\d+),no\.[\d,]+\((\d+)\),p\.(\d+)-(\d+)$
<re.Match object; span=(0, 29), match='vol.37,no.6,7(1987),p.370-377'>
37
1987
370
377
ValueError: not enough values to unpack (expected 5, got 4)

在我没有从JSON文件中读取它们，而是直接在Python中以我提到的形式拥有它们时，它是可以工作的。有人能解释一下这些JSON文件出了什么问题，或者也许使用不同类型的文件来存储这些字符串模式是更好的选择。

解决方案

似乎你的JSON序列化出了些问题。

最好使用Python从输入数据中创建JSON：

patterns = [
    r"^vol\.(\d+),no\.(\d+)\((\d+)\),p\.(\d+)-(\d+) $", #Vol. 12, no. 3, (2009), p. 118-120 r"^vol\.(\d+),no\.(\d+)\((\d+)\),p\.\[(\d+)-(\d+)\]$ ", #vol.1,no.7(2022),p.[1-6]
    r"^vol\.(\d+),no\.(\d+)\((\d+)\),p\.(\d+-\d+)-(\d+-\d+) $", #vol.10,no.3(2018),p.03015-1-03015-4 r"^vol\.(\d+),no\.([\d-]+)\((\d+)\)p\.(\d+)-(\d+)$ ",
    r"^vol(\d+),no\.([\d-]+)\((\d+)\),p\.(\d+)-(\d+) $", r"^vol\.(\d+[a-z]?),no\.(\d+)\((\d+)\),p\.(\d+)-(\d+)$ ", #Vol. 35A, no. 3 (2004), p. 751-759
    r"^vol\.(\d+),no\.([\d,]+)\((\d+)\),p\.(\d+)-(\d+) $", #Vol. 17, no. 7,8,9,10(2020), p. 573 - 582 r"^vol\.(\d+),no\.([\w]+)\((\d+)\),p\.(\d+)-(\d+)$ " # vol.7,no.6C(2019),p.38-45
    ]


import json
with open("patterns.json", "w") as f:
   json.dump({"patterns": patterns}, f, indent=2)

这应该给你一个包含以下内容的适当的JSON文件：

{
  "patterns": [
    "^vol\\.(\\d+),no\\.(\\d+)\\((\\d+)\\),p\\.(\\d+)-(\\d+) $", "^vol\\.(\\d+),no\\.(\\d+)\\((\\d+)\\),p\\.\\[(\\d+)-(\\d+)\\]$ ",
    "^vol\\.(\\d+),no\\.(\\d+)\\((\\d+)\\),p\\.(\\d+-\\d+)-(\\d+-\\d+) $", "^vol\\.(\\d+),no\\.([\\d-]+)\\((\\d+)\\)p\\.(\\d+)-(\\d+)$ ",
    "^vol(\\d+),no\\.([\\d-]+)\\((\\d+)\\),p\\.(\\d+)-(\\d+) $", "^vol\\.(\\d+[a-z]?),no\\.(\\d+)\\((\\d+)\\),p\\.(\\d+)-(\\d+)$ ",
    "^vol\\.(\\d+),no\\.([\\d,]+)\\((\\d+)\\),p\\.(\\d+)-(\\d+) $", "^vol\\.(\\d+),no\\.([\\w]+)\\((\\d+)\\),p\\.(\\d+)-(\\d+)$ "
  ]
}

将这段内容读回Python中并与原始数据进行比较，应该可以证明它被正确存储。