有没有办法搜索字符串并复制前面的文本直到它到达逗号？答案

【问题标题】：Is there a way to search for a string and copy text in front until it reaches a comma?有没有办法搜索字符串并复制前面的文本直到它到达逗号？
【发布时间】：2022-08-11 19:19:51
【问题描述】：

我是python新手，想将recentAveragePrice存储在一个变量中（来自像这样的字符串）

{\"assetStock\":null,\"sales\":250694,\"numberRemaining\":null,\"recentAveragePrice\":731,\"originalPrice\":null,\"priceDataPoints\":[{\"value\":661,\"date\":\"2022-08-11T05:00:00Z\"},{\"value\":592,\"date\":\"2022-08-10T05:00:00Z\"},{\"value\":443,\"date\":\"2022-08-09T05:00:00Z\"}],\"volumeDataPoints\":[{\"value\":155,\"date\":\"2022-08-11T05:00:00Z\"},{\"value\":4595,\"date\":\"2022-08-10T05:00:00Z\"},{\"value\":12675,\"date\":\"2022-08-09T05:00:00Z\"},{\"value\":22179,\"date\":\"2022-08-08T05:00:00Z\"},{\"value\":15181,\"date\":\"2022-08-07T05:00:00Z\"},{\"value\":14541,\"date\":\"2022-08-06T05:00:00Z\"},{\"value\":15310,\"date\":\"2022-08-05T05:00:00Z\"},{\"value\":14146,\"date\":\"2022-08-04T05:00:00Z\"},{\"value\":13083,\"date\":\"2022-08-03T05:00:00Z\"},{\"value\":14460,\"date\":\"2022-08-02T05:00:00Z\"},{\"value\":16809,\"date\":\"2022-08-01T05:00:00Z\"},{\"value\":17571,\"date\":\"2022-07-31T05:00:00Z\"},{\"value\":23907,\"date\":\"2022-07-30T05:00:00Z\"},{\"value\":39007,\"date\":\"2022-07-29T05:00:00Z\"},{\"value\":38823,\"date\":\"2022-07-28T05:00:00Z\"}]}

我目前的解决方案是这样的：

var = sampleStr[78] + sampleStr[79] + sampleStr[80]

它适用于当前字符串，但如果 recentAveragePrice 高于 999 它将停止工作，我想知道是否可以在字符串中搜索它而不是获得一个固定数字。

sampleStr 是什么？
请分享您尝试过的完整代码，否则我们只是猜测。
您确定要处理字符串而不是字典吗？
我在共享代码时遇到问题，但它在此复制页面中 replit.com/@ShyMike/8-Bit-Collection-Profit#main.py

标签： python python-3.x string variables search

【解决方案1】：

由于这是 json，您应该能够解析它并访问 recentAveragePrice：

import json
sample_string = '''{"assetStock":null,"sales":250694,"numberRemaining":null,"recentAveragePrice":731,"originalPrice":null,"priceDataPoints":[{"value":661,"date":"2022-08-11T05:00:00Z"},{"value":592,"date":"2022-08-10T05:00:00Z"},{"value":443,"date":"2022-08-09T05:00:00Z"}],"volumeDataPoints":[{"value":155,"date":"2022-08-11T05:00:00Z"},{"value":4595,"date":"2022-08-10T05:00:00Z"},{"value":12675,"date":"2022-08-09T05:00:00Z"},{"value":22179,"date":"2022-08-08T05:00:00Z"},{"value":15181,"date":"2022-08-07T05:00:00Z"},{"value":14541,"date":"2022-08-06T05:00:00Z"},{"value":15310,"date":"2022-08-05T05:00:00Z"},{"value":14146,"date":"2022-08-04T05:00:00Z"},{"value":13083,"date":"2022-08-03T05:00:00Z"},{"value":14460,"date":"2022-08-02T05:00:00Z"},{"value":16809,"date":"2022-08-01T05:00:00Z"},{"value":17571,"date":"2022-07-31T05:00:00Z"},{"value":23907,"date":"2022-07-30T05:00:00Z"},{"value":39007,"date":"2022-07-29T05:00:00Z"},{"value":38823,"date":"2022-07-28T05:00:00Z"}]}'''

data = json.loads(sample_string)
recent_price = data['recentAveragePrice']
print(recent_price)

输出：

【讨论】：

【解决方案2】：

好吧，如果您的变量是一个字符串，您可以将其更改为 dict ，如下所示：

import ast
dictionary=ast.literal_eval(variable_name)
average=dictionary['recentAveragePrice']

【讨论】：