Question

这是一个脚本，用于从特定日期收集来自www.coinmarketcap.com的历史加密货币数据。我的第76行索引超出范围。我使此错误列表索引超出范围。我不知道什么是导致此错误。请帮助人员。谢谢。

错误----第76行，在 startdate = sys.argv [1] IndexError：列表索引超出范围

import json
    import requests
    from bs4 import BeautifulSoup
    import csv
    import sys

    def CoinNames():
        """Gets ID's of all coins on cmc"""

        names = []
        response = requests.get("https://api.coinmarketcap.com/v1/ticker/?limit=0")
        respJSON = json.loads(response.text)
        for i in respJSON:
            names.append(i['id'])
        return names

    def gather(startdate, enddate, names):
        historicaldata = []
        counter = 1

        if len(names) == 0:
            names = CoinNames()

        for coin in names:
            r  = requests.get("https://coinmarketcap.com/currencies/{0}/historical-data/?start={1}&end={2}".format(coin, startdate, enddate))
            data = r.text
            soup = BeautifulSoup(data, "html.parser")
            table = soup.find('table', attrs={ "class" : "table"})

            #Add table header to list
            if len(historicaldata) == 0:
                headers = [header.text for header in table.find_all('th')]
                headers.insert(0, "Coin")

            for row in table.find_all('tr'):
                currentrow = [val.text for val in row.find_all('td')]
                if(len(currentrow) != 0):
                    currentrow.insert(0, coin)
                historicaldata.append(currentrow)

            print("Coin Counter -> " + str(counter), end='\r')
            counter += 1
        return headers, historicaldata

    def _gather(startdate, enddate):
        """ Scrape data off cmc"""

        if(len(sys.argv) == 3):
            names = CoinNames()
        else:
            names = [sys.argv[3]]

        headers, historicaldata = gather(startdate, enddate, names)

        Save(headers, historicaldata)

    def Save(headers, rows):

        if(len(sys.argv) == 3):
            FILE_NAME = "HistoricalCoinData.csv"
        else:
            FILE_NAME = sys.argv[3] + ".csv"

        with open(FILE_NAME, 'w') as f:
            writer = csv.writer(f)
            writer.writerow(headers)
            writer.writerows(row for row in rows if row)
        print("Finished!")

    if __name__ == "__main__":

        startdate = sys.argv[1]
        enddate = sys.argv[1]

        _gather(startdate, enddate)

Answer 1

使用sys.argv运行此命令时，必须从命令行传递参数。

$ python script.py 20180101

尽管我不确定开始日期的格式，也不确定如果有sys.argv[2]的原因，为什么没有sys.argv[3]

有关更多信息，请参见here。

无法收集历史数据索引超出范围？

1 个答案: