我是python编程的新手，所以为可能的新手问题表示歉意。我正在尝试在Marin County Socrata API中过滤“浮动时间戳记数据类型”。我正在使用他们在此处提供的基本轮廓：https://dev.socrata.com/foundry/data.marincounty.org/mkbn-caye＃！/ usr / bin / env python
# make sure to install these packages before running:
# pip install pandas
# pip install sodapy
import pandas as pd
from sodapy import Socrata
# Unauthenticated client only works with public data sets. Note 'None'
# in place of application token, and no username or password:
client = Socrata("data.marincounty.org", None)
# Example authenticated client (needed for non-public datasets):
# client = Socrata(data.marincounty.org,
# MyAppToken,
# userame="[email protected]",
# password="AFakePassword")
# First 2000 results, returned as JSON from API / converted to Python list of
# dictionaries by sodapy.
results = client.get("mkbn-caye", limit=2000)
# Convert to pandas DataFrame
results_df = pd.DataFrame.from_records(results)
我正在尝试对数据库进行ping操作，以获取有关在上周内提交的许可申请（具有“ received_date”）但尚未颁发许可（没有“ issued_date”）的信息。我想每周运行代码以获取更新。
我开始使用下面的代码，它确实起作用：将熊猫作为pd导入从苏打水进口苏格拉底客户端= Socrata（“ data.marincounty.org”，MyAppToken）结果= client.get（“ mkbn-caye”，Received_date ='2019-09-25T13：50：27.000'）results_df = pd.DataFrame.from_records（结果）print（results_df）＃打印数据框
但是，如果我从“ =”运算符到“>”运算符做了一点改动：
results = client.get("mkbn-caye", received_date > '2019-09-25T13:50:27.000')
我得到以下错误代码：
results = client.get("mkbn-caye", received_date > '2019-09-25T13:50:27.000')NameError：名称'received_date'未定义
'received_date'与“ =”运算符配合使用时，如何定义它呢？
就像我之前提到的，最终，我希望在接下来的工作中有所收获，但要迈出小步子
received_date > 'One Week Ago'\ #The date would be 1 week ago
issued_date IS NULL # This doesn't work either. I want entries that have no "issued_date" field yet
我正在尝试在此处使用准则：https://dev.socrata.com/foundry/data.marincounty.org/mkbn-caye与“浮动时间戳记数据类型”一起使用。有什么建议么？
这很简单。只是需要另外一对“”。
results = client.get("mkbn-caye", \
where="received_date > '2019-09-25T13:50:27.000'")