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Is there a way to search for a string and copy text in front until it reaches a comma?

I am new to python and wanted to store the recentAveragePrice inside a variable (from a string like this one)
{"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"}]}
My current solution is this:
var = sampleStr[78] + sampleStr[79] + sampleStr[80]
It works for the current string but if the recentAveragePrice was above 999 it would stop working and i was wondering if instead of getting a fixed number i could search for it inside the string.

Your replit code shows that you're acquiring JSON data from some website. Here's an example based on the URL that you're using. It shows how you check the response status, acquire the JSON data as a Python dictionary then print a value associated with a particular key. If the key is missing, it will print None:
import requests
(r := requests.get('https://economy.roblox.com/v1/assets/10159617728/resale-data')).raise_for_status()
jdata = r.json()
print(jdata.get('recentAveragePrice'))
Output:
640

Since this is json you should just be able to parse it and access 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)
outputs:
731

Your data is in a popular format called JSON (JavaScript Object Notation). It's commonly used to exchange data between different systems like a server and a client, or a Python program and JavaScript program.
Now Python doesn't use JSON per-se, but it has a data type called a dictionary that behaves very similarly to JSON. You can access elements of a dictionary as simply as:
print(my_dictionary["recentAveragePrice"])
Python has a built-in library meant specifically to handle JSON data, and it includes a function called loads() that can convert a string into a Python dictionary. We'll use that.
Finally, putting all that together, here is a more robust program to help parse your string and pick out the data you need. Dictionaries can do a lot more cool stuff, so make sure you take a look at the links above.
# import the JSON library
# specifically, we import the `loads()` function, which will convert a JSON string into a Python object
from json import loads
# let's store your string in a variable
original_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"}]}
"""
# convert the string into a dictionary object
dictionary_object = loads(original_string)
# access the element you need
print(dictionary_object["recentAveragePrice"])
Output upon running this program:
$ python exp.py
731

Getting value from api dict response

Im using requests with the Bitmex API, im trying to get the lastPrice value from the get requests.
I stored the response into a variable, tried a few ways into pulling the lastPrice value including print(value[1]) print(value['lastPrice'], all of which didnt work, ive been reading for a while now on here and cant seem to find the correct working way to get the value. sorry if this is asked all the time.
import requests
r = requests.get('https://www.bitmex.com/api/v1/instrument?symbol=XBT&columns=lastPrice&count=1&reverse=true')
value = r.text
print(value)
#print(value[1])
#print(value['lastPrice'])
The output from this is
[{"symbol":"XBTUSD","timestamp":"2019-10-03T22:37:13.085Z","lastPrice":8190.5}]
using value[1] just returns the first letter in the print. So for ex [1] returns { and using ['lastPrice'] returns
TypeError: string indices must be integers

Your return value is JSON string, you can use response.json() to decode it to python dict. Result contains list with single element, so you should refer to first element of list and then get value from dict by key:
r = requests.get('https://www.bitmex.com/api/v1/instrument?symbol=XBT&columns=lastPrice&count=1&reverse=true')
value = r.json()
print(value[0]['lastPrice'])

Decode text response from API in Python 3.6

I am trying to extract data from mailchimp export api, which returns responses based on the following specifications:
Returns:
Parameter - text
Description:
a plain text dump of JSON objects. The first row is a header row. Each additional row returned is an individual JSON object. Rows are delimited using a newline (\n) marker, so implementations can read in a single line at a time, handle it, and move on.
To get the data I am using:
response = requests.get(urldetails).text
If I use .json() it errors out with a JSON decode error. The output of the above is something along the lines of:
{data..}
{data...}
I am unsure whether each dict is on a separate row, however I am under the impression it's actually just one continuous string as many of my attempts to decode it ended up with an error 'str' object cannot be...etc. . I don't see the '\n' separators anywhere when I am using the .text method.
What's the best way of going about and make each dict a separate item in a list or a row in a dataframe (which I can unpack later).
Thanks

You can get all the data from the MailChimp export api using a simple approach. Please note that I am using f-strings, only available in Python 3.6+.
import requests
import json
apikey = '<your-api-key>'
id = "<list-id>"
URL = f"https://us10.api.mailchimp.com/export/1.0/campaignSubscriberActivity/?apikey={apikey}&id={id}"
json_data = [json.loads(s) for s in requests.get(URL).text.strip().split("\n")]
print(json_data[0]['<some-subscriber-email>'][0]['action'])

Provided that the text response isn't insanely badly formed json, you can use the json library. In particular, the loads() function.
import json
json_response = json.loads(response)
loads() loads JSON into a python dict from a string.
EDIT:
The Mailchimp API states that each JSON object is separated by a newline character. We can create a list of dicts with the following code:
# get response from GET request and load as a string
import json
json_resp = [json.loads(line) for line in response.split('\n')]

Extract a dictionnary value in Python

I have an API call result in Python which is returning the following:
b'[{"type":"deposit","currency":"bch","amount":"0.00000001","available":"0.00000001"}]'
I tried to extract the value 0.00000001 but without any success.
I know how to extract values from lists and dictionaries in Python,but as there is the b' value before the results I am not figuring out how to get it.
Any ideas?

I think what you have here is actually a bytes string, rather than a Python dictionary. Try this to convert it to a dictionary (actually a list containing a dictionary given the square brackets):
import json
data = json.loads(b'[{"type":"deposit","currency":"bch","amount":"0.00000001","available":"0.00000001"}]')
value = data[0]['amount']

The API is probably returning json data, you should parse it this way:
import json
data = json.loads(json_data)
print data[0]['amount']
json_data is what the API returns

How to print specific json list items?

I'm making a python bot and the response is coming back as
JSON.
Here is a quick show of what it brings back:
[["Message","User string from here."]]
So first what I've done is, loaded the json from the python module json.
json.loads(resp)
and it brings back:
[[u"Message",u"user string from here"]]
How do I print out the Message which will return the value user string from here?

All you need to do is:
from __future__ import print_function
import json
raw_response = '[["Message","User string from here."]]'
data = json.loads(raw_response)
print(data[0][1])

json.loads converts json into the native datatypes of python. So, when you did json.loads(resp), you get back a list of lists.
You can simply iterate over the list to access whatever elements you want.
In your case, print json.loads(resp)[0][1] should suffice.