Question

我正在尝试创建一个应用程序，它使用python从网站提取信息，我正在使用datetime格式。

def constructYFURL(ticker,start_date,end_date,freq):
    start_date = datetime.strptime(start_date,"%Y-%m-%d").date()
    end_date = datetime.strptime(end_date,"%Y-%m-%d").date()

    s=ticker.replace("^","%5E")

    if start_date.month-1<10:
        a="0"+str(start_date.month-1)
    else:
        a=str(start_date.month-1)

    # Also the month always has 2 digits
    b=str(start_date.day)

    c=str(start_date.year)

    if end_date.month - 1 < 10:
        d = "0" + str(end_date.month - 1)
    else:
        d = str(end_date.month - 1)

    e=str(end_date.day)

    f=str(end_date.year)

    `enter code here`g=freq

    yfURL = "http://real-chart.finance.yahoo.com/table.csv?   s="+s+"&a="+a+"&b="+b+"&c="+c+"&d="+d+"&e="+e+"&f="+f+"&g="+g+"&ignore=.csv"
return yfURL


from download import constructYFURL
ticker = "AAPL"
start_date = "2016-01-01"
end_date = " 2017-03-06"
freq = "d"

yfURL = constructYFURL(ticker,start_date,end_date,freq)

print yfURL

我收到以下错误消息：

ValueError：时间数据'2017-03-06'与格式'％Y-％m-％d'不匹配

Answer 1

你有一个额外的领先空间：

end_date = " 2017-03-06"

删除它，你得到的错误消失，程序运行

更好的格式化代码：

def constructYFURL(ticker,start_date,end_date,freq):
    start_date = datetime.strptime(start_date,"%Y-%m-%d").date()
    end_date = datetime.strptime(end_date,"%Y-%m-%d").date()

    s=ticker.replace("^","%5E")

    if start_date.month-1<10:
        a="0"+str(start_date.month-1)
    else:
        a=str(start_date.month-1)

    # Also the month always has 2 digits
    b=str(start_date.day)
    c=str(start_date.year)

    if end_date.month - 1 < 10:
        d = "0" + str(end_date.month - 1)
    else:
        d = str(end_date.month - 1)

    e=str(end_date.day)
    f=str(end_date.year)
    g=freq


    yfURL = "http://real-chart.finance.yahoo.com/table.csv?   s="+s+"&a="+a+"&b="+b+"&c="+c+"&d="+d+"&e="+e+"&f="+f+"&g="+g+"&ignore=.csv"
    return yfURL


ticker = "AAPL"
start_date = "2016-01-01"
end_date = "2017-03-06"
freq = "d"

yfURL = constructYFURL(ticker,start_date,end_date,freq)

print yfURL

日期格式无法转换为数据格式

1 个答案: