我如何使for循环从函数返回值

Question

So I have tried different methods of returning the data using data from a JSON file running in a loop.

The idea is that I have a config.json file with ip`s that need to be feed to the function when its called upon.

{
    "ip1" : "10.0.0.111",
    "ip2" : "10.0.0.112"
  }

import json
import urllib.request

with open('config.json') as config_file:
    data = json.load(config_file)

def temprature(v):

    urlData = f"http://{v}:8080/getdevice?device=type28_1"
    #print(urlData)
    webURL = urllib.request.urlopen(urlData)
    data = webURL.read()
    encoding = webURL.info().get_content_charset('utf-8')
    tempData = json.loads(data.decode(encoding))
    return tempData["Celsius"]


for (k, v) in data.items():
   #print("Key: " + k)
   temprature(v)
   #print(str(v))

I can`t see or figure out how I can fetch the tempdata and save it to an external variable. I have tried to make a variable that calls the for loop but that failed for me as well.

Edit: Being referred to as a duplicate of This post. But this does not cover the return from a for loop.

Answer 1

You need to save the value to some data structure - list, dictionary, whatever:

temperature_data = []
for (k, v) in data.items():
   #print("Key: " + k)
   temperature_data.append(temprature(v))
   #print(str(v))
    print(temprature(v))

print(temperature_data)

temperature_data = {}
for (k, v) in data.items():
   #print("Key: " + k)
   temperature_data[k] = temprature(v)
   #print(str(v))
   print(temprature(v))

print(temperature_data)

as @ggorlen mentioned, it seems that printing the results is what you'd like to ultimately do, so I added a print statement in the loop.

Make sure to establish the data structure outside of the loop, because otherwise, you'll be writing over the variable on each loop.