列出切片 json.loads 文件

Question

What this code does it gets the values of a json.loads file. It gives me a list of dictionary that are organized by dates. This code works, my understanding is, i am taking the the first value in the list of dictionaries, so the first dictionary, but shouldn't. self.get_jsonparsed_data(self.ticker_text.get().upper())[0] work as well? In my case it doesn't, I was hoping if someone can explain why I does not work.

def get_jsonparsed_data(self, ticker):
    #quote
    url = (f"https://financialmodelingprep.com/api/v3/quote/{ticker}?)


    response = urlopen(url)
    data = response.read().decode("utf-8")
    return json.loads(data)

def search_info(self):
    #self.info.delete(0, END)

    recent_filing = []

    for header in self.get_jsonparsed_data(self.ticker_text.get().upper())[:1]:
        recent_filing.append(header)

    ticker = self.ticker_text.get()

    #output dictionary values with proper format
    try:
        recent_filing_dict = recent_filing[0]

This works. I get the first dictionary which is what i want but when i do self.get_jsonparsed_data(self.ticker_text.get().upper())[0] instead of self.get_jsonparsed_data(self.ticker_text.get().upper())[:1] it gives me an error

which pretty much is saying there isnt any values appended to recent_filing_dict. I was just hoping if someone can explain why?

Answer 1

"for" loops through iterable and self.get_jsonparsed_data(self.ticker_text.get().upper())[0] seemingly returns an item rather than iterable (list) while self.get_jsonparsed_data(self.ticker_text.get().upper())[:1] returns an iterable (single item list) which is iterated over by for loop