您的代码假定stockprices对象中总是有一个字段“historical”，这里我修改了您的代码来检查这个字段，如果没有找到，我将打印出API返回的内容。

import requests
import pandas as pd
import matplotlib.pyplot as plt
def stockpriceanalysis(stock):
    stockprices = requests.get(f"https://financialmodelingprep.com/api/v3/historical-price-full/{stock}?serietype=line")
    stockprices = stockprices.json()
    #Parse the API response and select only last 1200 days of prices
    if 'historical' in stockprices:
        stockprices = stockprices['historical'][-1200:]
        #Convert from dict to pandas datafram
        stockprices = pd.DataFrame.from_dict(stockprices)
        stockprices = stockprices.set_index('date')
        #20 days to represent the 22 trading days in a month
        stockprices['20d'] = stockprices['close'].rolling(20).mean()
        stockprices['250d'] = stockprices['close'].rolling(250).mean()
        stockprices[['close','20d','250d']].plot(figsize=(10,4))
        plt.grid(True)
        plt.title(stock + ' Moving Averages')
        plt.axis('tight')
        plt.ylabel('Price')
    else:
        print('Historical data not found for stock provided, information that was retrieved here:')
        print(stockprices)
stockpriceanalysis('TSLA')

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看起来你忘了提供API key。我运行了这段代码，它要求我提供一个API key。

{'Error Message': 'Invalid API KEY. Please retry or visit our documentation to create one FREE https://financialmodelingprep.com/developer/docs'}

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检查official docs。