我尝试用python生成查询并用它们进行查询。我是熊猫队的队员。我的代码如下所示:
def generate_query(
filter=['CENTRAL BANK','DRAGHI','FRANKFURT'],
date ='20171214',
datetimeformat='%Y%m%d',
weekly_data=True
):
filter = str(filter).replace('[','').replace(']','')
if weekly_data == False:
query = '''SELECT * FROM `gdelt-bq.gdeltv2.events` WHERE SQLDATE = {date}'''.format(date = date)
else:
date = datetime.datetime.strptime(date, datetimeformat)
week = generate_week(date)
query = '''SELECT * FROM `gdelt-bq.gdeltv2.events` WHERE SQLDATE IN ({week})'''.format(
week = week).replace('[','').replace(']','')
return query, date
不知道如何在stackoverflow上缩进代码。尝试查询多个日期时出现问题:
'SELECT * FROM `gdelt-bq.gdeltv2.events` WHERE SQLDATE IN (\\'20171211\\', \\'20171212\\', \\'20171213\\', \\'20171214\\', \\'20171215\\')'
我不知道反斜杠是从哪里来的。知道为什么会这样吗?你知道吗
函数生成\u周:
def generate_week(date):
week = []
referenceday = date - datetime.timedelta(days = date.weekday())
for i in range(0,5):
day = referenceday + datetime.timedelta(days = i)
week.append(day.strftime('%Y%m%d'))
return week
返回的错误如下:
pandas_gbq.gbq.GenericGBQException: Reason: 400 No matching signature for operator IN for argument types INT64 and {STRING} at [1:55]
我将非常感谢您的帮助!:)
我相信你的问题是日期格式。除非另有规定,否则标准BQ要求yyyy mm dd格式。阅读更多here。如果你使用
strftime("%Y-%m-%d")
,那就足够了。你知道吗同样值得指出的是:
如果您使用的是python3.6+f,那么在本例中,字符串要比.format好一点。包括项目符号1(而不是项目符号2)中的更改,您可以改为:
从中选择-bq.gdeltv2版本.events“WHERE SQLDATE IN{week}'”
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